Gas turbine combustor

Abstract

A combustor for gas turbines according to one embodiment of the present disclosure is provided with: an outer wall that surrounds a combustion chamber; a liner that is positioned on the inner side of the outer wall and faces the combustion chamber; and, an attachment tool for attaching the liner to the outer wall with a gap between the outer wall and the liner. The attachment tool includes: a shaft for penetrating the outer wall; a head for supporting the liner; and, an airflow path that is positioned inside the attachment tool and connected to the combustion chamber, and includes a shape that corresponds to the shape of the head.

Description

[Technical Field]

[0001] The present disclosure relates to combustors for gas turbines. [Background technology]

[0002] In recent years, the combustion temperature in gas turbines has been increasing in order to improve fuel efficiency. To address this trend, combustors have been devised that have a liner attached to the inside of the outer wall (shell) that surrounds the combustion chamber. Furthermore, a fixture for attaching the liner has been proposed that has a head that supports the liner and has a cooling air flow path formed inside the head (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2003 / 0123953 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, a fitting for attaching a liner with a cooling air flow path has been proposed. However, the fitting does not heat evenly throughout, and the head exposed to the combustion chamber is particularly prone to becoming hot. Therefore, an object of the present disclosure is to provide a fitting for attaching a liner to an outer wall of a gas turbine combustor that suppresses the temperature rise of the head in particular. [Means for solving the problem]

[0005] A combustor for a gas turbine according to one aspect of the present disclosure comprises an outer wall surrounding a combustion chamber, a liner located inside the outer wall and facing the combustion chamber, and a mounting fixture that attaches the liner to the outer wall with a gap between the outer wall and the liner, the mounting fixture including a shaft portion that penetrates the outer wall, a head that supports the liner, and an air flow path that is located inside the mounting fixture, connects to the combustion chamber, and includes a shape that corresponds to the shape of the head. [Effects of the Invention]

[0006] According to the above configuration, it is possible to provide a combustor for a gas turbine that can suppress an increase in temperature of the head, in particular, of the fixture for attaching the liner to the outer wall. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view of a combustor according to a first embodiment. [Figure 2] FIG. 2 is an enlarged view of the vicinity of the fixture shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view of the fixture shown in FIG. [Figure 4] FIG. 4 is an enlarged view of the vicinity of the fixture in a modified example of the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view of a mounting fixture for a combustor according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (First embodiment) First, a combustor 100 according to the first embodiment will be described. The combustor 100 according to the present embodiment is for a gas turbine and is a so-called annular type. However, the combustor 100 may be of a type other than the annular type, such as a can type. FIG. 1 is a cross-sectional view of the combustor 100 at a certain circumferential position. A central axis (not shown) of the combustor 100 is located at the bottom of the plane of FIG. 1, the left-right direction of the plane of FIG. 1 is the axial direction of the combustor 100, and the up-down direction of the plane of FIG. 1 is the radial direction of the combustor 100 (hereinafter simply referred to as the "radial direction").

[0009] 1, a combustor 100 according to this embodiment includes an outer wall 10, a liner 20, and a mounting fixture 30. These components will be described below in order.

[0010] <Outer wall> The outer wall 10 is a member that surrounds the combustion chamber 11. The outer wall 10 is made of, for example, metal, but may be made of a material other than metal. The combustion chamber 11 in this embodiment is annular, and the portion of the outer wall 10 that is located radially outward from the combustion chamber 11 is a so-called outer shell 12, and the portion that is located radially inward from the combustion chamber 11 is a so-called inner shell 13. The outer wall 10 is surrounded by an annular housing 14, and the outer wall 10 and the combustion chamber 11 are located in an internal space 15 of the housing 14.

[0011] A fuel injection unit 16 is provided in the combustion chamber 11, and fuel is injected from the fuel injection unit 16 into the combustion chamber 11. Air is supplied to the internal space 15 of the housing 14, and a portion of the supplied air is supplied to the fuel injection unit 16. Furthermore, as shown by the white arrow in Figure 1, a portion of the remaining air supplied to the internal space 15 flows between the outer wall 10 and the housing 14.

[0012] <liner> The liner 20 is a component located inside the outer wall 10 and facing the combustion chamber 11. The liner 20 in this embodiment is attached to the outer wall 10. Although the liner 20 in this embodiment is plate-shaped, the shape of the liner 20 is not limited to this. The material of the liner 20 is also not limited. The material of the liner 20 may be a ceramic material, a metal material, or the like. For example, it may be a ceramic matrix composite (CMC). The liner 20 is attached to the outer wall 10 using a mounting fixture 30, which will be described later. The liner 20 may be an assembly of multiple panels arranged circumferentially to form a cylindrical shape. The liner 20 may also be molded as a single cylindrical unit without being divided into multiple panels arranged circumferentially.

[0013] FIG. 2 is an enlarged view of the vicinity of the fixture 30. The downward direction in FIG. 2 is the direction toward the combustion chamber 11 (hereinafter referred to as "inward"), and the upward direction in FIG. 2 is the direction away from the combustion chamber 11 (hereinafter referred to as "outward"). This also applies to FIGS. 3 to 5, which will be described later. As shown in FIG. 2, a gap is formed between the outer wall 10 and the liner 20. For example, the positions of the outer wall 10 and the liner 20 can be determined by inserting a spacer 21, a spring, or the like between the outer wall 10 and the liner 20. Alternatively, the positions of the outer wall 10 and the liner 20 may be determined by, for example, the fixture 30, without using these means.

[0014] The outer wall 10 has outer wall holes 17, and as shown by the white arrows in FIG. 2, air flows into the gap between the outer wall 10 and the liner 20 through these outer wall holes 17. Note that some of the air supplied to the fuel injection unit 16 may also flow into the gap between the outer wall 10 and the liner 20. The air that flows in cools the liner 20. Note that the shape of the means (e.g., spacer 21 or spring) for forming a gap between the outer wall 10 and the liner 20 is not limited, but is formed to allow air to pass through.

[0015] <Mounting fixture> The mounting fixture 30 is a member that mounts the liner 20 to the outer wall 10. The mounting fixture 30 is made of, for example, metal, but may be made of a material other than metal. FIG. 3 is a cross-sectional view of the mounting fixture 30. Strictly speaking, FIG. 3 shows not only the cross-section of the mounting fixture 30 but also the vicinity of the mounting fixture 30. As shown in FIGS. 2 and 3, the mounting fixture 30 includes a shaft portion 31, a head 32, an air flow path 33, an air intake port 39, a shaft groove 35, and a head groove 36. Note that, although the mounting fixture 30 includes the shaft groove 35 in this embodiment, the mounting fixture 30 does not necessarily need to include the shaft groove 35.

[0016] The shaft portion 31 is a portion that penetrates the outer wall 10. The shaft portion 31 has a columnar outer portion 37 located on the outer side of the shaft portion 31 and a columnar inner portion 38 located on the inner side of the shaft portion 31. For example, the outer portion 37 and the inner portion 38 are cylindrical. The boundary between the outer portion 37 and the inner portion 38 can be arbitrarily determined. The inner portion 38 may have a larger outer diameter than the outer portion 37. A fixing member is fastened to the portion of the inner portion 38 that is outward from the outer wall 10. For example, a male thread is formed on the portion of the inner portion 38 that is outward from the outer wall 10, and a nut 41 is fastened to this male thread. Other fastening methods may also be used. Furthermore, a spring 42, a spacer, or the like may be inserted between the nut 41 and the outer wall 10, or nothing may be inserted. In this embodiment, the spring 42 is a coil spring, but the type of spring is not limited thereto, and it may be, for example, a leaf spring. Spring 42 exerts an outward force on fixture 30 through nut 41 .

[0017] The head 32 is a portion that supports the liner 20. The head 32 is located inward of the shaft portion 31. In this embodiment, the outer diameter of the portion of the head 32 on the combustion chamber 11 side is larger than the outer diameter of the portion on the shaft portion 31 side. The head 32 has a shape that includes, for example, a truncated cone shape or a truncated pyramid shape. When the spring 42 is attached between the nut 41 and the outer wall 10, it applies an outward force to the mounting fixture 30, making it easier for the head 32 to maintain a state in which it is in close contact with the liner 20. Furthermore, as shown in FIG. 2, the head 32 is exposed to the combustion chamber 11 and is therefore more likely to become hotter than other portions of the mounting fixture 30.

[0018] The air flow path 33 is a flow path through which cooling air passes. As shown in FIG. 3 , the air flow path 33 is located inside the mounting fixture 30 from the shaft portion 31 to the head 32 and extends along the central axis of the mounting fixture 30. The air flow path 33 also opens to the combustion chamber 11. That is, the air flow path 33 is connected to the combustion chamber 11. The air flow path 33 of this embodiment includes a shape corresponding to the shape of the head 32. For example, the head 32 and the portion of the air flow path 33 corresponding to the head 32 both have a shape including a truncated cone shape or a truncated pyramid shape. Compared to when the entire air flow path 33 is cylindrical, this embodiment allows the thickness (volume) of the head 32 to be reduced, making it less likely for heat to accumulate in the head 32. Furthermore, the portion of the air flow path 33 corresponding to the head 32 can have a larger contact area with the cooling air, making it less likely for the head 32 to become hot.

[0019] Furthermore, the angle α of the outer peripheral surface 49 of the head 32 of the air flow path 33 with respect to the central axis 101 of the mounting fixture 30 may be 30 degrees or more and 45 degrees or less. By setting the angle α of the outer peripheral surface 49 of the head 32 with respect to the central axis 101 of the mounting fixture 30 to 30 degrees or more, the head 32 can reliably support the liner 20. Furthermore, by setting the angle α of the outer peripheral surface 49 of the head 32 with respect to the central axis 101 of the mounting fixture 30 to 45 degrees or less, the area of ​​the end face 43 of the head 32 (the surface facing the combustion chamber 11) is reduced, and the head 32 can be prevented from becoming too hot. Note that the angle of the inner peripheral surface 40 of the head 32 with respect to the central axis 101 of the mounting fixture 30 may be the same as or different from the angle α of the outer peripheral surface 49 of the head 32 with respect to the central axis 101 of the mounting fixture 30.

[0020] Furthermore, the inner circumferential surface 40 and the end face 43 (the surface facing the combustion chamber 11) of the head 32 may have a thermal barrier coating (TBC) layer on their surfaces. The TBC layer may be, for example, a layer including a top coat such as a ceramic coating for thermal insulation and a bond coat such as an aluminum diffusion coating for oxidation resistance. By having the TBC layer on the inner circumferential surface 40 and the end face 43 of the head 32, heat is less likely to be transferred from the combustion chamber 11 to the inner circumferential surface 40 and the end face 43 of the head 32, and the head 32 can be prevented from becoming too hot.

[0021] The air intake 39 is an intake port for air into the air flow path 33. The air intake 39 can be used as a swirl generator 34 that swirls the air passing through the air flow path 33. A plurality of air intakes 39 are formed on the side surface of the outer portion 37 of the shaft portion 31. However, the number and positions of the air intakes 39 are not limited. The air intake 39 is a portion that takes in air from outside the mounting fixture 30 into the air flow path 33. In this embodiment, this taken-in air functions as cooling air that cools the mounting fixture 30.

[0022] When the supply direction of air supplied from air inlet 39 to air flow path 33 is inclined relative to the radial direction of air flow path 33, the air taken in from air inlet 39 passes through air flow path 33 while swirling along the wall surface that forms air flow path 33, as shown by the dashed arrow in Figure 3. Note that air inlet 39 extends perpendicular to the central axis direction of mounting fixture 30 (parallel to outer wall 10). Air inlet 39 may be inclined relative to the central axis direction of mounting fixture 30 so that air can easily flow toward combustion chamber 11.

[0023] When the air passes through the air flow path 33 while swirling, the cooling air stays in the air flow path 33 for a long time and comes into close contact with the wall surface that forms the air flow path 33, thereby effectively cooling the mounting fixture 30. In addition, the air can be sent at an angle that makes it easy for it to come into contact with the end surface of the head 32 (the surface facing the combustion chamber 11), so the end surface of the head 32 can be effectively cooled. Note that a spiral groove may be formed in the wall surface that forms the air flow path 33, and this groove may serve as the swirl generating portion 34.

[0024] The shaft groove 35 is a groove located on the outer peripheral surface 48 of the shaft portion 31. In this embodiment, the mounting fixture 30 includes the shaft groove 35, but it is not required to include the shaft groove 35. When the mounting fixture 30 includes the shaft groove 35, as shown in FIG. 2 , multiple shaft grooves 35 are formed on the outer peripheral surface 48 of the shaft portion 31 at equal intervals in the circumferential direction, and the shaft grooves 35 extend linearly along the central axis of the shaft portion 31. However, the shaft grooves 35 do not have to extend linearly, but may extend spirally, and the number of shaft grooves 35 is not limited. The inner end (one end) of the shaft groove 35 is connected to the head groove 36 described below. The outer end (the other end) may be located between the outer wall 10 and the liner 20 or may be located outward of the outer wall 10. If the outer end of the shaft groove 35 is located between the outer wall 10 and the liner 20, the shaft groove 35 can be shortened, which makes it easier to process the mounting fixture 30. When the outer end of the shaft groove 35 is located outward from the outer wall 10, the contact area between the fixture 30 and the cooling air increases, so that the fixture 30 can be cooled effectively.

[0025] The head groove 36 is a groove located on the outer peripheral surface 49 of the head 32. In this embodiment, a plurality of head grooves 36 are formed on the outer peripheral surface 49 of the head 32 corresponding to the axial grooves 35. Furthermore, the outer end (one end) of each head groove 36 is connected to the gap between the outer wall 10 and the liner 20. The inner end (the other end) is connected to the combustion chamber 11. Furthermore, the outer end (one end) of each head groove 36 may be connected to the axial groove 35. When the head groove 36 is connected to the axial groove 35 (i.e., when the mounting fixture 30 includes the axial groove 35), the contact area between the mounting fixture 30 and the cooling air can be increased, thereby enabling the mounting fixture 30 to be cooled effectively. Air that flows into the gap between the outer wall 10 and the liner 20 passes through the head groove 36, or passes through both the axial groove 35 and the head groove 36, and is released into the combustion chamber 11. At this time, the head 32 is cooled by the air passing through the outer peripheral surface 49.

[0026] When the head groove 36 is formed in the head 32 described above (for example, in a truncated cone shape), the head groove 36 becomes longer, increasing the contact area between the head 32 and the air, and enabling the head 32 to be cooled more effectively. The head groove 36 may be arranged so that the outer end and the inner end are located at different circumferential positions when viewed from the central axial direction of the head 32. The head groove 36 may also be curved. In this case, the same effect can be obtained.

[0027] When both the air intake port 39 and the head groove 36 are used, the inside, end face, and outside of the head 32 can be cooled simultaneously, thereby effectively cooling the head 32. Furthermore, when the direction of the air passing through the air intake port 39 is the same as the direction of the air passing through the head groove 36, the air passing through each is less likely to stagnate near the air flow path 33, so that cooling air can be stably sent to the head 32. For example, the air passing through the air intake port 39 and the head groove 36 may each be swirled.

[0028] In the above-described embodiment, the outer end and inner end of the head groove 36 are located at different circumferential positions and are curved, but the shape of the head groove 36 is not limited to the above. For example, as shown in Fig. 4, the outer end and inner end of the head groove 36 may be located at the same circumferential position as viewed from the central axis direction of the head 32, or may be linear. Furthermore, the number of grooves is not limited.

[0029] (Second embodiment) Next, a combustor 200 according to a second embodiment will be described. Fig. 5 is a cross-sectional view of the combustor 200 according to the second embodiment, and corresponds to Fig. 3 of the first embodiment. The combustor 200 according to this embodiment differs from the combustor 100 according to the first embodiment in the configuration of the air flow path 33 of the mounting fixture 30. Other points are basically the same as those of the combustor 100 according to the first embodiment. Hereinafter, the air flow path 33 of the combustor 200 according to this embodiment will be described.

[0030] As shown in FIG. 5, the air flow path 33 of this embodiment has a double structure and includes an inner flow path 51 and an outer flow path 52.

[0031] The inner flow path 51 is a flow path that extends along the central axis direction of the mounting fixture 30. Here, the air intake 39 in this embodiment includes an inner air intake 53 that connects to the inner flow path 51, and an outer air intake 54 that connects to the outer flow path 52. A plurality of inner air intakes 53 that connect to the inner flow path 51 are formed on the side surface of the outer part 37 of the shaft part 31, but the number is not limited. When the central axis of each inner air intake 53 is inclined with respect to the radial direction of the inner flow path 51, the air taken in from the inner air intake 53 passes through the inner flow path 51 while swirling.

[0032] The outer flow passage 52 is a flow passage that surrounds all or part of the inner flow passage 51. The inner flow passage 51 and the outer flow passage 52 are separated by a cylindrical inner wall 55. The outer flow passage 52 may be formed to correspond to part of the inner flow passage 51. A plurality of outer air intake ports 54 connected to the outer flow passage 52 are formed on the side surface of the inner part 38 of the shaft part 31, but the number is not limited. When the central axis of the outer air intake port 54 is inclined with respect to the radial direction of the outer flow passage 52, the air taken in from the outer air intake port 54 passes through the outer flow passage 52 while swirling.

[0033] In the above embodiment, the air flow path 33 has a double structure, but the air flow path 33 may also have only the outer flow path 52.

[0034] In this way, the outer flow passage 52 of the air flow passage 33 of this embodiment allows the fitting 30 to be cooled by air passing through the outer flow passage 52, so that the entire fitting 30 can be cooled effectively.

[0035] The flow path area of ​​the outer flow path 52 at the end on the combustion chamber 11 side may be smaller than the flow path area of ​​the inner flow path 51 at the end on the combustion chamber 11 side. Also, the flow path area of ​​the outer flow path 52 at the end on the combustion chamber 11 side may be smaller than the flow path area of ​​the air intake 39 (outer air intake 54) of the outer flow path 52. Because the air flow velocity is maintained at the end on the combustion chamber 11 side of the outer flow path 52, the air can flow close to the wall surface that forms the air flow path 33 in the portion of the air flow path 33 that corresponds to the head 32. As a result, the head 32 can be cooled effectively.

[0036] In the above-described embodiment, the angle α of the outer peripheral surface 49 of the head 32 of the inner flow passage 51 and the outer peripheral surface 50 of the head 32 of the outer flow passage 52 with respect to the central axis 101 of the mounting fixture 30 may be 30 degrees or more and 45 degrees or less. Furthermore, the inner peripheral surface 44 and the end face 46 (the surfaces facing the combustion chamber 11) of the head 32 of the inner flow passage 51, and the inner peripheral surface 45 and the end face 47 (the surfaces facing the combustion chamber 11) of the head 32 of the outer flow passage 52 may have a thermal barrier coating (TBC) layer on their surfaces.

[0037] (summary) A first item disclosed in this specification is a combustor for a gas turbine, comprising: an outer wall surrounding a combustion chamber; a liner located inside the outer wall and facing the combustion chamber; and a mounting fixture that attaches the liner to the outer wall with a gap between the outer wall and the liner, the mounting fixture including a shaft portion that penetrates the outer wall, a head that supports the liner, and an air flow path that is located inside the mounting fixture, connects to the combustion chamber, and includes a shape that corresponds to the shape of the head.

[0038] This configuration reduces the thickness of the head, making it less likely for heat to accumulate, and increases the contact area between the airflow path and the cooling air at the head, thereby preventing the head in particular from becoming too hot.

[0039] A second item disclosed in this specification is a combustor for a gas turbine according to the first item, wherein the liner includes a ceramic matrix composite material.

[0040] This configuration can improve the heat resistance of the combustor.

[0041] A third item disclosed in this specification is a combustor for a gas turbine according to the first or second item, wherein the head and the air flow passage both include a frustoconical shape.

[0042] According to this configuration, in a fixture having a head with a truncated cone shape, an air flow path can be formed that corresponds to the shape of the head, so that the fixture, particularly the head, can be cooled effectively.

[0043] A fourth item disclosed in this specification is a combustor of a gas turbine according to any one of the first to third items, wherein the mounting fixture includes an air intake that takes in air into the air flow path.

[0044] This configuration allows a continuous air flow to be generated in the air flow path.

[0045] A fifth item disclosed in this specification is a combustor for a gas turbine according to any one of the first to third items, wherein the mounting fixture includes a swirl generating portion that swirls air passing through the air flow path.

[0046] With this configuration, the cooling air stays in the air flow path for a long time and is in close contact with the wall surfaces that form the air flow path, so the fixture can be cooled effectively.

[0047] A sixth item disclosed in this specification is a combustor for a gas turbine according to the fifth item, wherein the swirl generating section supplies air to the air flow path in a direction inclined with respect to a central axis direction of the mounting fixture.

[0048] This configuration allows the air in the air flow passage to flow more easily toward the combustion chamber.

[0049] The seventh item disclosed in this specification is that the air flow path has an inner flow path located on the central axis of the mounting fixture and an outer flow path surrounding all or part of the inner flow path.

[0050] According to this configuration, the cooling air can be caused to flow close to the wall surfaces that form the air flow paths, so that the fixture can be cooled effectively.

[0051] An eighth item disclosed in this specification is a combustor for a gas turbine according to the seventh item, wherein a flow path area of ​​an end of the outer flow path on a combustion chamber side is smaller than a flow path area of ​​an end of the inner flow path on a combustion chamber side.

[0052] With this configuration, the flow rate of the cooling air is maintained even in the portion of the outer flow path corresponding to the head, so that the cooling air flows close to the wall surface that defines the air flow path, thereby effectively cooling the head.

[0053] A ninth item disclosed in the present specification is a combustor for a gas turbine according to the seventh item, wherein a flow path area of ​​an end of the outer flow path on the combustion chamber side is smaller than a flow path area of ​​an air intake of the outer flow path.

[0054] Even in this configuration, the flow rate of the cooling air is maintained in the portion of the outer flow path corresponding to the head, so the cooling air flows close to the wall surface that defines the air flow path, thereby effectively cooling the head.

[0055] A tenth item disclosed in this specification is a combustor for a gas turbine according to any one of the first to ninth items, wherein the mounting fixture includes a head groove located on an outer peripheral surface of the head for discharging air into the combustion chamber, and the direction of the air passing through the head groove is the same as the direction of the air passing through the air flow path.

[0056] With this configuration, the air passing through the head groove and the air flow path is less likely to stagnate near the air flow path, so that cooling air can be sent to the head in a stable manner.

[0057] An eleventh item disclosed in this specification is a combustor for a gas turbine according to any one of the first to tenth items, wherein an angle of an outer peripheral surface of the head with respect to a central axis of the mounting fixture is equal to or greater than 30 degrees and equal to or less than 45 degrees.

[0058] This configuration allows the head to firmly support the liner and also prevents the head from becoming too hot.

[0059] An eleventh item disclosed in the present specification is a combustor for a gas turbine according to any one of the first to tenth items, wherein an inner circumferential surface and an end surface of the head have a thermal barrier coating layer on the surface.

[0060] This configuration makes it difficult for heat to be transferred from the combustion chamber to the inner circumferential surface and end surface of the head, thereby preventing the head from becoming too hot. [Explanation of symbols]

[0061] 10 Outer wall 11 Combustion chamber 20 Liner 30 Mounting fixture 31 Shaft 32 heads 33 Air flow path 34 Swirl generating section 35 Shaft groove 36 Head groove 39 Air intake 51 Inner flow path 52 Outer channel 100 Combustor 200 Combustor

Claims

1. an outer wall surrounding the combustion chamber; a liner located inside the outer wall and facing the combustion chamber; a fixture for attaching the liner to the outer wall with a gap between the outer wall and the liner, The mounting fixture is a shaft portion that penetrates the outer wall; a head supporting the liner; an air flow passage located within the fitting and connected to the combustion chamber, the air flow passage including a shape corresponding to a shape of the head; the air flow path has an inner flow path located on a central axis of the mounting fixture and an outer flow path surrounding all or a part of the inner flow path, a flow passage area of ​​the outer flow passage at an end of the outer flow passage on a combustion chamber side is smaller than a flow passage area of ​​the inner flow passage at an end of the inner flow passage on a combustion chamber side.

2. an outer wall surrounding the combustion chamber; a liner located inside the outer wall and facing the combustion chamber; a fixture for attaching the liner to the outer wall with a gap between the outer wall and the liner, The mounting fixture is a shaft portion that penetrates the outer wall; a head supporting the liner; an air flow passage located within the fitting and connected to the combustion chamber, the air flow passage including a shape corresponding to a shape of the head; the air flow path has an inner flow path located on a central axis of the mounting fixture and an outer flow path surrounding all or a part of the inner flow path, A combustor for a gas turbine, wherein a flow path area of ​​the outer flow path at an end of the outer flow path on a combustion chamber side is smaller than a flow path area of ​​an air intake of the outer flow path.

3. an outer wall surrounding the combustion chamber; a liner located inside the outer wall and facing the combustion chamber; a fixture for attaching the liner to the outer wall with a gap between the outer wall and the liner, The mounting fixture is a shaft portion that penetrates the outer wall; a head supporting the liner; an air flow passage located within the fitting and connected to the combustion chamber, the air flow passage including a shape corresponding to a shape of the head; the mounting fixture includes a head groove located on an outer peripheral surface of the head for discharging air into the combustion chamber; A combustor for a gas turbine, wherein a direction of air passing through the head groove is along a direction of air passing through the air flow path.

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