U.S. patent application number 14/851171 was filed with the patent office on 2016-01-07 for cooling promoting structure.
The applicant listed for this patent is IHI Corporation. Invention is credited to Shu FUJIMOTO, Chiyuki NAKAMATA, Yoji OKITA.
Application Number | 20160003549 14/851171 |
Document ID | / |
Family ID | 51536835 |
Filed Date | 2016-01-07 |
United States Patent
Application |
20160003549 |
Kind Code |
A1 |
FUJIMOTO; Shu ; et
al. |
January 7, 2016 |
COOLING PROMOTING STRUCTURE
Abstract
A cooling promoting structure in which a first flow path walls
includes a first collision surface which collides with cooling gas
flowing through a first flow path, a second flow path walls
includes a second collision surface which collides with the cooling
gas flowing through a second flow path, and the first flow path and
the second flow path are connected to each other via inflow
openings at a location where the first collision surface and the
second collision surface are disposed.
Inventors: |
FUJIMOTO; Shu; (Tokyo,
JP) ; NAKAMATA; Chiyuki; (Tokyo, JP) ; OKITA;
Yoji; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
IHI Corporation |
Tokyo |
|
JP |
|
|
Family ID: |
51536835 |
Appl. No.: |
14/851171 |
Filed: |
September 11, 2015 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
PCT/JP2014/056528 |
Mar 12, 2014 |
|
|
|
14851171 |
|
|
|
|
Current U.S.
Class: |
165/164 |
Current CPC
Class: |
Y02T 50/676 20130101;
Y02T 50/60 20130101; F02C 7/18 20130101; F05D 2260/2212 20130101;
Y02T 50/671 20130101; F28D 7/0066 20130101; F05D 2260/204 20130101;
F01D 5/187 20130101 |
International
Class: |
F28D 7/00 20060101
F28D007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 14, 2013 |
JP |
2013-052422 |
Claims
1. A cooling promoting structure which is provided in a cooling
flow path which is formed between a first member and a second
member disposed to face each other, comprising: a plurality of
first flow path walls which are erected on the first member and
form first flow paths on the first member side of the cooling flow
path; and a plurality of second flow path walls which are erected
on the second member and form second flow paths on the second
member side of the cooling flow path, wherein each of the first
flow path walls includes a first collision surface which collides
with cooling gas flowing through the first flow path, each of the
second flow path walls includes a second collision surface which
collides with cooling gas flowing through the second flow path, and
the first flow path and the second flow path are connected to each
other at a location where the first collision surface and the
second collision surface are disposed.
2. The cooling promoting structure according to claim 1, wherein
all the first flow paths and second flow paths communicate with
each other.
3. The cooling promoting structure according to claim 1, wherein
the first flow path wall, the second flow path wall, the first flow
path, and the second flow path have a mirror symmetrical shape
having a center about a symmetrical axis connecting an upstream
side and a downstream side of the cooling flow path, as a unit
shape, and a plurality of the unit shapes are arranged in
directions orthogonal to the symmetrical axis.
4. The cooling promoting structure according to claim 2, wherein
the first flow path wall, the second flow path wall, the first flow
path, and the second flow path have a mirror symmetrical shape
having a center about a symmetrical axis connecting an upstream
side and a downstream side of the cooling flow path, as a unit
shape, and a plurality of the unit shapes are arranged in
directions orthogonal to the symmetrical axis.
5. The cooling promoting structure according to claim 3, wherein
the first flow path walls and the second flow path walls are formed
in a wave form having the same width, and are arranged at intervals
equal to the width in the symmetrical axis direction.
6. The cooling promoting structure according to claim 4, wherein
the first flow path walls and the second flow path walls are formed
in a wave form having the same width, and are arranged at intervals
equal to the width in the symmetrical axis direction.
7. The cooling promoting structure according to claim 5, wherein a
width of a connection opening at the connection location between
the first flow path and the second flow path is narrower than each
of the widths of the first flow path and the second flow path.
8. The cooling promoting structure according to claim 6, wherein a
width of a connection opening at the connection location between
the first flow path and the second flow path is narrower than each
of the widths of the first flow path and the second flow path.
9. The cooling promoting structure according to claim 1, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
10. The cooling promoting structure according to claim 2, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
11. The cooling promoting structure according to claim 3, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
12. The cooling promoting structure according to claim 4, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
13. The cooling promoting structure according to claim 5, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
14. The cooling promoting structure according to claim 6, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
15. The cooling promoting structure according to claim 7, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
16. The cooling promoting structure according to claim 8, wherein
the first collision surfaces or the second collision surfaces are
provided at all connection locations between the first flow paths
and the second flow paths.
Description
[0001] This application is a Continuation of International
Application No. PCT/JP2014/056528, filed on Mar. 12, 2014, claiming
priority based on Japanese Patent Application No. 2013-052422,
filed on Mar. 14, 2013, the content of which is incorporated herein
by reference in their entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to a cooling promoting
structure.
BACKGROUND ART
[0003] For example, in a turbine blade or the like which is exposed
to high-temperature atmosphere, a cooling promoting structure
configured to effectively prevent an increase in a temperature of
the turbine blade is incorporated. Patent Document 1 discloses a
cooling promoting structure, in which a plurality of partition
plates are provided in an inner portion of a hollow turbine blade,
to which cooling air is supplied, at equal intervals in a height
direction of a blade, and a lattice structure is formed between the
partition plates. In addition, in the descriptions below, "height"
indicates a dimension in the height direction of the blade, that
is, a dimension in a direction perpendicular to a rotary shaft of
an engine.
[0004] In the cooling promoting structure disclosed in Patent
Document 1, the cooling air flowing to a pressure surface side of a
space formed between the partition plates collides with the
partition plates and is extracted from a hole portion of the
lattice structure. Accordingly, the cooling air flows into a
suction surface side of the space. In addition, the cooling air
flowing to a suction surface side of the space collides with the
partition plates and is extracted from a different hole portion.
Accordingly, the cooling air flows into the pressure surface side
of the space. According to the cooling promoting structure, when
the cooling air flowing along the pressure surface collides with
the partition plates and a flow direction of the cooling air is
changed so that the cooling air flows into the suction surface, the
cooling air collides with a blade wall of the suction surface side
of the space and the blade wall is impinge cooled. Accordingly, the
cooling effectiveness is increased.
PRIOR ART DOCUMENT
Patent Document
[0005] [Patent Document 1] Japanese Unexamined Patent Application,
First Publication No. 2008-64002
SUMMARY
Technical Problem
[0006] In general, a turbine blade is made of cast metal.
Accordingly, in order to form a cooling promoting structure which
is an internal structure of the turbine blade, it is necessary to
use a core corresponding to the cooling promoting structure. Since
a lattice structure is a complicated structure, the core is also
complicated, and it is difficult to maintain the strength of the
core. Accordingly, manufacturing of the core needs to be performed
carefully.
[0007] In the cooling promoting structure disclosed in Patent
Document 1, there are excellent effects in that the cooling
effectiveness increases. However, it is not easy to manufacture the
cooling promoting structure. This is because a plurality of
partition plates are provided, the core which corresponds to a
lattice structure and has low strength is formed in a comb shape
since the core requires a gap corresponding to the partition plate,
and it is not easy to maintain the strength of the core.
[0008] In addition, in a case where the cooling promoting structure
is applied to a structure other than the turbine blade and the
structure is made of cast metal, similarly, it is not easy to
ensure the strength of the core, and it is difficult to manufacture
the structure.
[0009] The disclosure is made in consideration of the
above-described circumstances, and an object thereof is to provide
a cooling promoting structure capable of increasing cooling
effectiveness of impingement cooling and enhancing the
manufacturability of a product where the cooling promoting
structure is used.
Solution to Problem
[0010] According to a first aspect of the disclosure, there is
provided a cooling promoting structure which is provided in a
cooling flow path which is formed between a first member and a
second member disposed to face each other, including a plurality of
first flow path walls which are erected on the first member and
form first flow paths on the first member side of the cooling flow
path, and a plurality of second flow path walls which are erected
on the second member and form second flow paths on the second
member side of the cooling flow path, in which each of the first
flow path walls includes a first collision surface which collides
with cooling gas flowing through the first flow path, each of the
second flow path walls includes a second collision surface which
collides with cooling gas flowing through the second flow path, and
the first flow path and the second flow path are connected to each
other at a location where the first collision surface and the
second collision surface are disposed.
[0011] According to a second aspect of the disclosure, in the first
aspect, all the first flow paths and second flow paths communicate
with each other.
[0012] According to a third aspect of the disclosure, in the first
aspect or the second aspect, the first flow path wall, the second
flow path wall, the first flow path, and the second flow path have
a mirror symmetrical shape having a center about a symmetrical axis
connecting an upstream side and a downstream side of the cooling
flow path, as a unit shape, and a plurality of the unit shapes are
arranged in directions orthogonal to the symmetrical axis.
[0013] According to a fourth aspect of the disclosure, in the third
aspect, the first flow path walls and the second flow path walls
are formed in a wave form having the same width, and are arranged
at intervals equal to the width in the symmetrical axis
direction.
[0014] According to a fifth aspect of the disclosure, in the fourth
aspect, the width of a connection opening at the connection
location between the first flow path and the second flow path is
narrower than each of the widths of the first flow path and the
second flow path.
[0015] According to a sixth aspect of the disclosure, in any one of
the first aspect to the fifth aspect, the first collision surfaces
or the second collision surfaces are provided at all connection
locations between the first flow paths and the second flow
paths.
[0016] Advantageous Effects of Disclosure
[0017] According to the disclosure, if the cooling gas flowing
through the first flow paths collides with the collision surfaces
(first collision surfaces) of the first flow path walls, the
cooling gas flows into the second flow paths and impinge cools the
second member. In addition, if the cooling gas flowing through the
second flow paths collides with the collision surfaces (second
collision surfaces) of the second flow path walls, the cooling gas
flows into the first flow paths and impinge cools the first member.
Therefore, according to the disclosure, it is possible to impinge
cool the first member and the second member without providing the
partition plates disclosed in Patent Document 1, and it is possible
to increase the cooling effectiveness.
[0018] In addition, according to the disclosure, since the
partition plates are not required, it is possible to increase the
strength of a core which is used when a product applied by the
disclosure is cast.
[0019] That is, according to the disclosure, it is possible to
prevent the core from being formed in a comb shape, and it is
possible to enhance the manufacturability of the product applied by
the disclosure.
[0020] Therefore, according to the disclosure, it is possible to
increase the cooling effectiveness of the impingement cooling, and
it is possible to enhance the manufacturability of the product
applied by the disclosure.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1A is a perspective view of a turbine blade including a
cooling promoting structure which is an embodiment of the
disclosure.
[0022] FIG. 1B is a sectional view taken along A-A of FIG. 1A.
[0023] FIG. 2A is a perspective view of a portion of the cooling
promoting structure which is an embodiment of the disclosure.
[0024] FIG. 2B is an enlarged view of a portion of FIG. 2A.
[0025] FIG. 3 is an exploded perspective view of the cooling
promoting structure which is an embodiment of the disclosure.
[0026] FIG. 4A is a plan view of a portion of the cooling promoting
structure which is an embodiment of the disclosure.
[0027] FIG. 4B is a section view of the cooling promoting structure
which is an embodiment of the disclosure.
[0028] FIG. 5A is a plan view of a portion of a core which is used
when the turbine blade is cast.
[0029] FIG. 5B is a sectional view of the core which is used when
the turbine blade is cast.
[0030] FIG. 6A is a plan view of a portion of a modification
example of the cooling promoting structure which is an embodiment
of the disclosure.
[0031] FIG. 6B is a sectional view of the modification example of
the cooling promoting structure which is an embodiment of the
disclosure.
[0032] FIG. 7 is a perspective view of another modification example
of the cooling promoting structure which is an embodiment of the
disclosure.
[0033] FIG. 8 is a perspective view of still another modification
example of the cooling promoting structure which is an embodiment
of the disclosure.
[0034] FIG. 9 is a perspective view of still another modification
example of the cooling promoting structure which is an embodiment
of the disclosure.
DESCRIPTION OF EMBODIMENTS
[0035] Hereinafter, with reference to the drawings, an embodiment
of a cooling promoting structure according to the disclosure will
be described. Moreover, in descriptions below, a turbine blade into
which the cooling promoting structure of the disclosure is
incorporated will be described. In addition, in the following
drawings, in order to show each member so as to be recognizable,
the scale of each member is appropriately changed.
[0036] FIG. 1A is a perspective view of a turbine blade 1 including
a cooling promoting structure 10 of the present embodiment. FIG. 1B
is a sectional view taken along A-A of FIG. 1A. Moreover, in FIG.
1A, in order to show the cooling promoting structure 10 of the
present embodiment so as to be recognizable, a portion of a
pressure surface of the turbine blade 1 is cut and shown.
[0037] In the present embodiment, the turbine blade 1 is a rotor
blade of a turbine which is mounted on a jet engine. The turbine
blade 1 includes a dovetail 1a which is inserted into a disk
(rotary body), a platform 1b which is formed on the dovetail 1a,
and a blade portion 1c which is formed on the platform 1b.
[0038] As shown in FIG. 1B, the blade portion 1c is an airfoil
portion in which the sectional shape includes a leading edge 1ca, a
trailing edge 1cb, a pressure surface 1cc, and a suction surface
1cd, and includes a cooling flow path 1ce in the inner portion
close to the trailing edge 1cb. In addition, the cooling flow path
1ce includes a cooling air introduction portion 1cf formed by the
leading edge 1ca, an opening end 1cg formed by the trailing edge
1cb, and an intermediate portion 1ch which connects the cooling air
introduction portion 1cf and the opening end 1cg to each other.
[0039] The cooling air introduction portion 1cf is provided to
linearly extend from the lower end portion to the upper end portion
of the blade portion 1c in the height direction (up-down direction
in FIG. 1A), and a through hole 1d penetrating the dovetail 1a and
the platform 1b in the height direction of the blade portion 1c is
connected to the lower end of the cooling air introduction portion
1cf. The opening end 1eg is provided to be slightly close to the
leading edge 1ea further from the trailing edge 1cb, and is open
toward the trailing edge 1cb. The opening end 1cg also is provided
to linearly extend from the lower end portion to the upper end
portion of the blade portion 1c in the up-down direction in the
height direction. The height of the intermediate portion 1ch is the
same as the heights of the cooling air introduction portion 1cf and
the opening end 1cg.
[0040] In the cooling flow path 1ce, first, cooling air X supplied
via the through hole 1d flows into the cooling air introduction
portion 1cf, and the cooling air X supplied to the cooling air
introduction portion 1cf is ejected toward the trailing edge 1cb
from the opening end 1cg via the intermediate portion 1ch. That is,
the cooling air X flows from the leading edge 1ca side toward the
trailing edge 1cb through the cooling flow path 1ce which is formed
inside the blade portion 1c. When the cooling air X flows through
the cooling flow path 1ce, the cooling air X absorbs heat from the
blade portion 1c and cools the blade portion 1c. In addition, after
the cooling air X is ejected from the opening end 1eg, the cooling
air X flows along the pressure surface 1cc of the blade portion 1c.
Accordingly, the blade portion 1c is film cooled up to the trailing
edge 1cb.
[0041] In addition, as shown in FIG. 1B, in the portion in which
the cooling flow path 1ce is formed, a blade wall of the pressure
surface 1cc and a blade wall of the suction surface 1cd are
disposed to face each other in a state where the cooling flow path
1ce is interposed therebetween. That is, the cooling flow path 1ce
is formed between the blade wall of the pressure surface 1cc and
the blade wall of the suction surface 1cd which are disposed to
face each other. Hereinafter, the blade wall of the pressure
surface 1cc is referred to as a pressure surface blade wall 21
(first member), and the blade wall of the suction surface 1cd is
referred to as a suction surface blade wall 22 (second member).
[0042] The cooling promoting structure 10 of the present embodiment
is provided in the intermediate portion 1ch of the cooling flow
path 1ce, and is interposed between the pressure surface blade wall
21 and the suction surface blade wall 22. FIG. 2A is a perspective
view showing a portion of the cooling promoting structure 10, and
FIG. 2B is a perspective view in which a portion of the FIG. 2A is
further enlarged. FIG. 3 is an exploded perspective view of the
cooling promoting structure 10. FIG. 4A is a plan view showing a
portion of the cooling promoting structure 10, and FIG. 4B is a
sectional view of the cooling promoting structure 10. In FIG. 4A,
for easy viewing, hatching portions different from each other are
assigned to first flow path walls 11 and second flow path walls 13
which are described below.
[0043] As shown in the drawings, the cooling promoting structure 10
of the present embodiment includes the first flow path walls 11,
first flow paths 12, the second flow path walls 13, and second flow
paths 14. Each of the first flow path walls 11 is erected from the
pressure surface blade wall 21 toward the suction surface blade
wall 22, and is a wall portion having an approximately rectangular
section.
[0044] As shown in FIGS. 2A and 4A, each of the first flow path
walls 11 is formed in a wave form in which bending is repeated at a
constant period. In addition, the plurality of first flow path
walls 11 are arranged in a front-rear direction of the blade
portion 1c at equal intervals.
[0045] A portion of a side surface of each of the first flow path
walls 11 is a first collision surface 11a on which the cooling air
X flowing through the first flow path 12 collides with the first
flow path wall 11. The first collision surface 11a is a connection
location between the first flow path 12 and the second flow path
14, and is provided at the location (location at which the first
flow path 12 is bent) at which the cooling air X flows from the
first flow path 12 into the second flow path 14.
[0046] As described above, the first flow paths 12 are flow paths
which are formed by the plurality of first flow path walls 11
arranged at equal intervals, and are formed of gaps between the
first flow path walls 11. Since the first flow paths 12 are formed
of the gaps between the first flow path walls 11, similar to the
first flow path walls 11, each of the first flow paths 12 is formed
in a wave form in which bending is repeated at a constant period.
The first flow path 12 is provided so as to be close to the
pressure surface blade wall 21 in a space (that is, cooling flow
path 1ce) interposed between the pressure surface blade wall 21 and
the suction surface blade wall 22.
[0047] Each of the second flow path walls 13 is erected from the
suction surface blade wall 22 toward the pressure surface blade
wall 21, and similarly to the first flow path wall 11, is a wall
portion having a rectangular section. As shown in FIG. 2A or 4A,
each of the second flow path walls 13 is formed in a wave form in
which bending is repeated at a constant period. In addition, a
period of the wave form formed by the second flow path walls 13 is
the same as a period of the wave form formed by the first flow path
walls 11, and a phase of the wave form formed by the second flow
path walls 13 is shifted 180.degree. to a phase of the wave form
formed by the first flow path wall 11. In addition, the plurality
of second flow path walls 13 are arranged at equal intervals in the
front-rear direction of the blade portion 1c. Moreover, the
distance in the plate thickness direction from the suction surface
blade wall 22 to the pressure surface blade wall 21 side surface of
the second flow path wall 13 is the same as the distance in the
plate thickness from the pressure surface blade wall 21 to the
suction surface blade wall 22 side surface of the first flow path
wall 11. That is, the distance in the thickness direction of the
first flow path wall 11 from the pressure surface blade wall 21 is
set so as to be the same as the distance in the thickness direction
of the second flow path wall 13 from the suction surface blade wall
22 so that a boundary surface between the first flow path wall 11
and the second flow path wall 13 becomes a flat surface except for
the connection location between the first flow path 12 and the
second flow path 14.
[0048] A portion of a side surface of each of the second flow path
walls 13 is a second collision surface 13a on which the cooling air
X flowing through the second flow path 14 collides with the second
flow path wall 13. The second collision surface 13a is the
connection location between the first flow path 12 and the second
flow path 14, and is provided at the location (location at which
the second flow path 14 is bent) at which the cooling air X flows
from the second flow path 14 into the first flow path 12.
[0049] As described above, the second flow paths 14 are flow paths
which are formed by the plurality of second flow path walls 13
arranged at equal intervals, and are formed of gaps between the
second flow path walls 13. Since the second flow paths 14 are
formed of the gaps between the second flow path walls 13, similar
to the second flow path walls 13, each of the second flow paths 14
is formed in a wave form in which bending is repeated at a constant
period. The second flow path 14 is provided so as to be close to
the suction surface blade wall 22 in the space (that is, cooling
flow path 1ce) interposed between the pressure surface blade wall
21 and the suction surface blade wall 22.
[0050] As shown in FIG. 4A, the first flow paths 12 and the second
flow paths 14 are disposed so as to overlap with each other at a
plurality of locations when viewed from an approximately normal
direction of the pressure surface 1cc or the suction surface 1cd.
The first flow paths 12 and the second flow path 14 are connected
to each other at the portions at which the first flow paths 12 and
the second flow path 14 overlap with each other, and as a result,
openings 15 are formed. All the first flow paths 12 and second flow
paths 14 communicate with each other via the openings 15. Among the
openings 15, the openings 15 which are provided at bent portions of
the first flow paths 12 and the second flow paths 14 function as
inflow openings 15a (connection openings) through which the cooling
air X flows from the first flow paths 12 into the second flow paths
14 or flows from the second flow paths 14 into the first flow paths
12. In addition, the first flow paths 12 and the second flow paths
14 are disposed so as to completely overlap each other over the
entire region of the widths of the flow paths (the widths of the
first flow paths 12 and the widths of the second flow paths 14) in
the inflow openings 15a. That is, the width of each of the inflow
openings 15a is the same as the width of the first flow path 12 and
the width of the second flow path 14.
[0051] As shown in FIG. 2A, the first flow path walls 11, the first
flow paths 12, the second flow path walls 13, and the second flow
paths 14 are formed in wave forms which are bent at a constant
period. The cooling promoting structure 10 including the first flow
path walls 11, the first flow paths 12, the second flow path walls
13, and the second flow paths 14 has a mirror symmetrical shape
having a center about a symmetrical axis connecting an upstream
side and a downstream side of the cooling flow path 1ce, as a unit
shape, and a plurality of the unit shapes are arranged in
directions orthogonal to the symmetrical axis.
[0052] Each of the first flow path walls 11 and the second flow
path walls 13 is formed in a wave form having the same width, and
the first flow path walls and the second flow path walls are
arranged at intervals equal to the width in the symmetrical axis
direction.
[0053] As described above, the cooling promoting structure 10 of
the present embodiment includes the plurality of first flow path
walls 11 which are erected on the pressure surface blade wall 21
and form the first flow paths 12 on the pressure surface blade wall
21, and the plurality of second flow path walls 13 which are
erected on the suction surface blade wall 22 and form the second
flow paths 14 on the suction surface blade wall 22. In addition,
the first flow path walls 11 include the first collision surfaces
11a which collide with the cooling gas X flowing through the first
flow paths 12, and the second flow path walls 13 includes the
second collision surfaces 13a which collide with the cooling gas X
flowing through the second flow paths 14. The first flow paths 12
and the second flow paths 14 are connected to each other via the
inflow openings 15a at the disposition locations of the first
collision surfaces 11a and the second collision surfaces 13a.
[0054] FIG. 5A is a plan view of a portion of a core 30 which is
used when the turbine blade 1 is cast. FIG. 5B is a sectional view
of the core 30. The core 30 is a ceramic member which is disposed
inside a mold to form the cooling promoting structure 10 of the
present embodiment when the turbine blade 1 is cast. In the core
30, portions corresponding to the first flow path walls 11 and the
second flow path walls 13 are hollow, and portions corresponding to
the first flow paths 12 and the second flow paths 14 are solid. The
cooling promoting structure 10 of the present embodiment does not
include partition plates by which the cooling flow path 1ce is
divided in the height direction of the turbine blade 1.
Accordingly, the core 30 is not formed in a comb shape without need
for hollow portions corresponding to the partition plates.
[0055] Next, effects of the cooling promoting structure 10 of the
present embodiment having the above-described configuration will be
described.
[0056] If the cooling air X is supplied to the through hole 1d of
the turbine blade 1, the cooling air X is supplied to the cooling
promoting structure 10 via the cooling air introduction portion
1cf. The cooling air X supplied to the cooling promoting structure
10 is distributed into the first flow paths 12 and the second flow
paths 14 at the inlet (the end portion of the leading edge 1ca
side) of the cooling promoting structure 10.
[0057] As shown by solid arrows in FIG. 2B, the cooling air X
distributed into the first flow paths 12 flows through the first
flow paths 12 along the first flow path walls 11, and collides with
the first collision surfaces 11a orthogonal to the flow directions
at the locations at which the first flow path walls 11 are bent.
The cooling air X colliding with the first collision surfaces 11a
flows into the second flow paths 14 via the inflow openings 15a. In
this case, the cooling air X collides with the suction surface
blade wall 22 and impinge cools the suction surface blade wall 22.
As shown by broken lines in FIG. 2B, the cooling air X colliding
with the suction surface blade wall 22 flows through the second
flow paths 14 along the second flow path walls 13 and collides with
the second collision surfaces 13a orthogonal to the flow directions
at the locations at which the second flow path walls 13 are bent.
The cooling air X colliding with the second collision surface 13a
flows into the first flow paths 12 again via the inflow openings
15a. In this case, the cooling air X collides with the pressure
surface blade wall 21 and impinge cools the pressure surface blade
wall 21.
[0058] As shown by the broken arrows in FIG. 2B, the cooling air X
distributed into the second flow paths 14 flows through the second
flow paths 14 along the second flow path walls 13, and collides
with the second collision surfaces 13a orthogonal to the flow
directions at the locations at which the second flow path walls 13
are bent. The cooling air X colliding with the second collision
surfaces 13a flows into the first flow paths 12 via the inflow
openings 15a. In this case, the cooling air X collides with the
pressure surface blade wall 21 and impinge cools the pressure
surface blade wall 21. As shown by the solid lines in FIG. 2B, the
cooling air X colliding with the pressure surface blade wall 21
flows through the first flow paths 12 along the first flow path
walls 11 and collides with the first collision surfaces 11a
orthogonal to the flow directions at the locations at which the
first flow path walls 11 are bent. The cooling air X colliding with
the first collision surface 11a flows into the second flow paths 14
again via the inflow openings 15a. In this case, the cooling air X
collides with the suction surface blade wall 22 and impinge cools
the suction surface blade wall 22.
[0059] In this way, the cooling air X distributed into the first
flow paths 12 and the second flow paths 14 collides with the first
collision surfaces 11a or the second collision surfaces 13a.
Accordingly, whenever the flow path of the cooling air X is
changed, the cooling air X impinge cools the pressure surface blade
wall 21 or the suction surface blade wall 22. In addition, the
cooling air X discharged from the cooling promoting structure 10 is
ejected to the outside of the turbine blade 1 via the opening end
1cg and film-cools the vicinity of the trailing edge 1cb.
[0060] According to the cooling promoting structure 10 of the
present embodiment, even when the partition plates dividing the
inner portion of the cooling flow path 1ce in the height direction
of the blade are not provided, it is possible to impinge cool the
pressure surface blade wall 21 and the suction surface blade wall
22, and it is possible to increase the cooling effectiveness. In
addition, according to the cooling promoting structure 10 of the
present embodiment, since the partition plates are not required, it
is possible to prevent the shape of the core 30 from being formed
in a comb shape, and it is possible to increase the strength of the
core 30. Accordingly, it is possible to enhance the
manufacturability of the turbine blade 1. Therefore, according to
the cooling promoting structure 10 of the present embodiment, it is
possible to increase the cooling the effectiveness of the
impingement cooling, and it is possible to enhance the
manufacturability of the turbine blade 1.
[0061] In addition, since the partition plates are not required, it
is possible to allow the cooling air X to flow the entire cooling
flow path 1ce, and it is possible to more uniformly cool the
pressure surface blade wall 21 and the suction surface blade wall
22. Moreover, since the partition plates are not required, it is
possible to decrease the weight of the cooling promoting structure
10, and it is possible to decrease the weight of the turbine blade
1.
[0062] Moreover, in the cooling promoting structure 10 of the
present embodiment, all the first flow paths 12 and second flow
paths 14 communicate with each other via the openings 15. In the
core 30 which is configured to form the cooling promoting structure
10, since all solid portions are connected to each other, the
strength of the core 30 increases. Accordingly, it is possible to
enhance the manufacturability of the turbine blade 1.
[0063] In addition, in the cooling promoting structure 10 of the
present embodiment, the first flow path walls 11, the second flow
path walls 13, the first flow paths 12, and the second flow paths
14 have the mirror symmetrical shape, which has a center about a
symmetrical axis connecting the upstream side and the downstream
side of the cooling flow path 1ce, as the unit shape, and a
plurality of the unit shapes are arranged in directions orthogonal
to the symmetrical axis. According to the cooling promoting
structure 10 having the shape, since the shapes in the directions
orthogonal to the symmetrical axis are repeated patterns of the
unit shapes, it is possible to simplify the shape of the core 30
and to easily mold the core 30.
[0064] In addition, in the cooling promoting structure 10 of the
present embodiment, each of the first flow path walls 11 and the
second flow path walls 13 is formed in a wave form having the same
width, and the first flow path walls and the second flow path walls
are arranged at intervals equal to the width in the symmetrical
axis direction. Therefore, according to the cooling promoting
structure 10 having the shape, since the shape in the symmetrical
axis direction is a repeated pattern, it is possible to simplify
the shape of the core 30 and to easily mold the core 30.
[0065] Hereinbefore, a preferred embodiment of the disclosure is
described with reference to the accompanying drawings. However, the
disclosure is not limited to the embodiment. The shapes,
combinations, or the like of the components shown in the embodiment
are examples, and various modifications may be applied based on
design request or the like within the scope of the disclosure.
[0066] FIG. 6A is a plan view of a portion of a modification
example of the cooling promoting structure 10 of the embodiment.
FIG. 6B is a sectional view of the modification example of the
cooling promoting structure 10. As shown in FIGS. 6A and 6B, in the
modification example, by decreasing amplitudes of the shapes of the
first flow path walls 11 and the second flow path walls 13 in the
plan view, the width of each of the inflow openings 15a is narrower
than the width of each of the first flow paths 12 and the second
flow paths 14. In this way, in the modification example, since the
width of the inflow opening 15a is narrower than the width of
inflow opening 15a of the above-described first embodiment, flow
velocity of the cooling air X passing through the inflow openings
15a increases, and it is possible to further increase the effects
of the impingement cooling.
[0067] Moreover, the shapes of the first flow path walls 11 and the
second flow path walls 13 are not limited to the embodiment. For
example, as shown in FIG. 7, the shapes of the first flow path
walls and the second flow path walls are respectively configured of
lattice portions and block portions disposed at the centers of the
lattice portions, and the first flow path walls and the second flow
path walls may be disposed so as to be shifted from each other. In
addition, as shown in FIG. 8, the first flow path walls and the
second flow path walls having wide widths may be disposed. Also in
this configuration, the first flow path walls can include the first
collision surfaces which collide with the cooling air flowing
through the first flow paths, and the second flow path walls can
include the second collision surfaces which collide with the
cooling air flowing through the second flow paths.
[0068] In addition, in a state where an arrangement pitch of the
first flow path walls 11 and an arrangement pitch of the second
flow path walls 13 are maintained, it is possible to change the
width of the inflow openings 15a by changing a bending angle of the
first flow path wall 11 and a bending angle of the second flow path
wall 13. For example, by increasing the bending angles, it is
possible to decrease overlapping portions between the first flow
paths 12 and the second flow paths 14, and it is possible to
decrease the widths of the inflow openings 15a.
[0069] Moreover, as shown in FIG. 9, by adjusting repetition
periods, widths, or the like of the first flow path walls 11 and
the second flow path walls 13, a cooling promoting structure 10C in
which all openings 15 are the inflow openings 15a may be adopted.
That is, the first collision surfaces 11a or the second collision
surfaces 13a are provided on all the connection locations between
the first flow paths 12 and the second flow paths 14. Accordingly,
it is possible to remove openings 15 which are not the inflow
openings. Therefore, the number of inflow openings 15a per unit
wall area of the blade increases, and it is possible to further
increase the cooling promotion effectiveness.
[0070] In addition, in the above-described embodiments, the
configuration in which the cooling promoting structure of the
disclosure is applied to the turbine blade 1 is described. However,
the disclosure is not limited to this, and for example, the
disclosure may be applied to a platform or a combustor liner.
[0071] Moreover, in the above-described embodiments, the
configuration in which air is used as the cooling gas is described.
However, the disclosure is not limited to this, and other gas may
be used as the cooling gas.
INDUSTRIAL APPLICABILITY
[0072] According to the cooling promoting structure of the
disclosure, it is possible to increase the cooling effectiveness of
impingement cooling, and it is possible to enhance the
manufacturability of a product where the cooling promoting
structure is used.
[0073] While preferred embodiments of the disclosure have been
described and shown above, it should be understood that these are
exemplary examples of the disclosure and are not to be considered
as limiting. Additions, omissions, substitutions, and other
modifications can be made without departing from the scope of the
disclosure. Accordingly, the disclosure is not to be considered as
being limited by the foregoing description, and is only limited by
the scope of the appended claims.
* * * * *