Perforated plate of gas turbine burner, gas turbine burner and gas turbine

Abstract

The perforated plate of the gas turbine burner of at least one embodiment is disposed between the inner cylinder and the outer cylinder of the gas turbine burner and is fixedly arranged on the outer peripheral portion of the inner cylinder. In the hole configuration region of the perforated plate where a plurality of through holes are provided, the average value of the frame hole ratio obtained by dividing the distance between the outer peripheral edges of two adjacent holes among the plurality of through holes by the distance between the centers of the two holes is larger in the region closer to the inner cylinder than in the region closer to the outer cylinder.

Description

Technical Field

[0001] The present disclosure relates to a perforated plate for a gas turbine burner, a gas turbine burner, and a gas turbine.

[0002] This application claims priority based on Japanese Patent Application No. 2020-149132 filed with the Japan Patent Office on September 4, 2020, and incorporates its content herein. Background Art

[0003] In a gas turbine burner, in order to suppress the uneven flow of air in the gas turbine burner, a rectifying plate (perforated metal) is sometimes disposed between the inner cylinder and the outer cylinder of the gas turbine burner (for example, refer to Patent Document 1).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-9262 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] For example, when the above-mentioned rectifying plate is welded and fixed to the inner cylinder of the gas turbine burner, the rectifying plate vibrates due to combustion vibration during operation, and the stress acting on the fixing portion on the inner cylinder side of the rectifying plate becomes large. Therefore, deformation of the rectifying plate and breakage such that the holes in the rectifying plate are connected to each other may occur.

[0009] At least one embodiment of the present disclosure has been completed in view of the above circumstances, and an object thereof is to suppress deformation and breakage of a rectifying plate provided between the inner cylinder and the outer cylinder of a gas turbine burner.

[0010] Solutions to the Problems

[0011] (1) The perforated plate of the gas turbine burner according to at least one embodiment of the present disclosure is disposed between the inner cylinder and the outer cylinder of the gas turbine burner and is fixedly arranged on the outer peripheral portion of the inner cylinder.

[0012] In a region of the perforated plate where a plurality of through holes are provided, in a region closer to the inner cylinder side than a region closer to the outer cylinder side, the average value of the frame hole ratio obtained by dividing the distance between the outer peripheral edges of two adjacent holes among the plurality of through holes by the distance between the centers of the two holes is larger.

[0013] (2) The gas turbine burner according to at least one embodiment of the present disclosure includes the perforated plate having the structure of (1) above.

[0014] (3) The gas turbine of at least one embodiment of the present disclosure includes the gas turbine burner having the structure described in (2) above.

[0015] Advantages of the Invention

[0016] According to at least one embodiment of the present disclosure, deformation and breakage of the rectifying plate provided between the inner cylinder and the outer cylinder of the gas turbine burner can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of gas turbines showing several embodiments.

[0018] Figure 2 It is a cross-sectional view of burners showing several embodiments.

[0019] Figure 3 It is a cross-sectional view of the main part of burners showing several embodiments.

[0020] Figure 4 It is a perspective view of the inner cylinder and the rectifying plate regarding several embodiments, observed from the downstream side of the air passage.

[0021] Figure 5 It is regarding the inner cylinder and the rectifying plate of several embodiments, Figure 3 view taken along the line A-A in.

[0022] Figure 6 It is a diagram for explaining the holes of the rectifying plate of several embodiments.

[0023] Figure 7A It is an example of a graph showing the radial distribution of the frame hole ratio.

[0024] Figure 7B It is an example of a graph showing the radial distribution of the increase rate of the frame hole ratio.

[0025] Figure 8A It is an example of a graph showing the radial distribution of the frame hole ratio.

[0026] Figure 8B It is an example of a graph showing the radial distribution of the increase rate of the frame hole ratio.

[0027] Figure 9A It is an example of a graph showing the radial distribution of the frame hole ratio.

[0028] Figure 9B It is an example of a graph showing the radial distribution of the increase rate of the frame hole ratio.

[0029] Figure 10A It is an example of a graph showing the radial distribution of the frame hole ratio.

[0030] Figure 10B This is an example of a graph showing the radial distribution of the increase rate of the cell porosity.

[0031] Figure 11 This is an example of a diagram showing another embodiment regarding the size of the holes.

[0032] Figure 12 This is an example of a diagram showing another embodiment regarding the size of the holes.

[0033] Figure 13 This is an example of a diagram showing another embodiment regarding the size of the holes. Detailed Embodiments

[0034] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. Among them, the dimensions, materials, shapes, relative configurations, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure thereto, but are merely illustrative examples.

[0035] For example, expressions indicating relative or absolute configurations such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only represent such strict configurations, but also represent states in which there are tolerances or relative displacements by angles and distances to such an extent that the same functions can be obtained.

[0036] For example, expressions indicating states where things are equal such as "same", "equivalent", and "homogeneous" not only represent strictly equal states, but also represent states with tolerances or differences to such an extent that the same functions can be obtained.

[0037] For example, expressions indicating shapes such as quadrilateral shape and cylindrical shape not only represent geometrically strict quadrilateral shapes, cylindrical shapes, etc., but also represent shapes including concavo-convex portions, chamfered portions, etc. within a range where the same effects can be obtained.

[0038] On the other hand, expressions such as "comprising", "containing", "equipped with", "including", or "having" a component are not exclusive expressions that exclude the existence of other components.

[0039] (Regarding gas turbine 1)

[0040] Figure 1 This is a schematic structural diagram of a gas turbine showing several embodiments.

[0041] Refer to Figure 1 An example of the application object of a gas turbine burner and a perforated plate of a gas turbine burner in several embodiments, namely a gas turbine, will be described.

[0042] As Figure 1As shown, the gas turbine 1 of several embodiments includes a compressor 2 for generating compressed air as an oxidant, a gas turbine combustor 4 for generating combustion gas using the compressed air and fuel, and a turbine 6 configured to be driven and rotated by the combustion gas. In the case of the gas turbine 1 for power generation, a generator not shown is connected to the turbine 6, and power is generated by the rotation energy of the turbine 6. In the following description, the gas turbine combustor 4 is also simply referred to as the combustor 4.

[0043] Specific configuration examples of each portion in the gas turbine 1 according to several embodiments will be described.

[0044] The compressor 2 of several embodiments includes a compressor chamber 10, an air intake port 12 provided on the inlet side of the compressor chamber 10 and used to take in air, a rotor 8 provided to pass through the compressor chamber 10 and a turbine chamber 22 described later, and various blades provided in the compressor chamber 10. The various blades include an inlet guide vane 14 provided on the side of the air intake port 12, a plurality of stationary blades 16 fixed to the side of the compressor chamber 10, and a plurality of moving blades 18 implanted on the rotor 8 in an alternating arrangement relative to the stationary blades 16. It should be noted that the compressor 2 also includes other components such as an exhaust chamber not shown. In such a compressor 2, the air taken in from the air intake port 12 is compressed by the plurality of stationary blades 16 and the plurality of moving blades 18 to become high-temperature and high-pressure compressed air. Then, the high-temperature and high-pressure compressed air is transported from the compressor 2 to the combustor 4 of the subsequent stage.

[0045] The burner 4 of several embodiments is disposed in the housing 20. Figure 1 As shown, a plurality of burners 4 may be arranged in a ring shape with the rotor 8 as the center in the housing 20. Fuel and compressed air generated by the compressor 2 are supplied to the burner 4, and the fuel is burned to generate combustion gas as the working fluid of the turbine 6. Then, the combustion gas is delivered from the burner 4 to the turbine of the subsequent stage. It should be noted that detailed structural examples of the burners 4 of several embodiments will be described later.

[0046] The turbine 6 of several embodiments includes a turbine chamber 22 and various blades arranged in the turbine chamber 22. The various blades include a plurality of stationary blades 24 fixed to the side of the turbine chamber 22, and a plurality of moving blades 26 implanted on the rotor 8 in an alternating arrangement relative to the stationary blades 24. It should be noted that the turbine 6 may also include other components such as outlet guide vanes. In the turbine 6, the combustion gas passes through the plurality of stationary blades 24 and the plurality of moving blades 26, driving the rotor 8 to rotate. As a result, the generator connected to the rotor 8 is driven.

[0047] On the downstream side of the turbine chamber 22, an exhaust chamber 30 is connected via an exhaust machine chamber 28. The combustion gas after driving the turbine 6 is discharged to the outside via the exhaust machine chamber 28 and the exhaust chamber 30.

[0048] (Regarding the burner 4)

[0049] Figure 2 It is a cross-sectional view of burners showing several embodiments. Figure 3 It is a cross-sectional view of the main part of burners showing several embodiments.

[0050] Refer to Figure 2 and Figure 3 , and the detailed structure of the burner 4 of several embodiments will be described.

[0051] As Figure 2 and Figure 3 shown, a plurality of burners 4 of several embodiments are arranged in a ring shape centered on the rotor 8 (refer to Figure 1 ). Each burner 4 includes a burner liner 46 provided in a burner chamber 40 divided by a housing 20, a pilot burner 50 respectively arranged in the burner liner 46, and a plurality of premixed burners (main burners) 60. The burner 4 also includes an outer cylinder 45 provided on the outer peripheral side of an inner cylinder 47 of the burner liner 46 inside the housing 20. An air passage 43 for compressed air to flow is formed on the outer peripheral side of the inner cylinder 47 and the inner peripheral side of the outer cylinder 45.

[0052] It should be noted that the burner 4 may also have other constituent elements such as a bypass pipe (not shown) for bypassing the combustion gas.

[0053] In the burner 4 of several embodiments, a rectifying plate 100 is arranged in the air passage 43. The rectifying plate 100 is a porous plate provided between the inner cylinder 47 and the outer cylinder 45 and fixedly arranged on the outer peripheral part of the inner cylinder 47, and a plurality of through holes (holes 110) penetrating the rectifying plate 100 are arranged. The rectifying plate 100 of several embodiments will be described in detail later.

[0054] For example, the burner liner 46 has an inner cylinder 47 arranged around the pilot burner 50 and a plurality of premixed burners 60, and a tail cylinder 48 connected to the front end of the inner cylinder 47.

[0055] The pilot burner 50 is arranged along the central axis of the burner liner 46. Moreover, a plurality of premixed burners 60 are arranged separately so as to surround the pilot burner 50.

[0056] The pilot burner 50 has a pilot nozzle (nozzle) 54 connected to the fuel port 52, a pilot cone 56 disposed so as to surround the pilot nozzle 54, and a swirler 58 provided on the outer periphery of the pilot nozzle 54.

[0057] The premix burner 60 has a main nozzle (nozzle) 64 connected to the fuel port 62, a burner cylinder 66 disposed so as to surround the nozzle 64, an extension pipe 65 connecting the burner cylinder 66 and the burner liner 46 (e.g., the inner cylinder 47), and a swirler 70 provided on the outer periphery of the nozzle 64.

[0058] In the burner 4 having the above structure, the high-temperature and high-pressure compressed air generated by the compressor 2 is supplied from the chamber inlet 42 into the burner chamber 40, and then flows from the burner chamber 40 into the burner cylinder 66 via the air passage 43. It should be noted that the compressed air flowing in the air passage 43 is rectified by a plurality of holes 110 formed in the rectifying plate 100. Then, this compressed air is premixed with the fuel supplied from the fuel port 62 in the burner cylinder 66. At this time, the premixed gas mainly forms a swirling flow through the swirler 70 and flows into the burner liner 46. In addition, the compressed air is mixed with the fuel ejected from the pilot burner 50 via the fuel port 52 in the burner liner 46, and is ignited by a pilot flame (not shown) to burn, generating combustion gas. At this time, a part of the combustion gas diffuses around along with the flame, whereby the premixed gas flowing into the burner liner 46 from each premix burner 60 is ignited and burned. That is, by the pilot flame formed by the pilot fuel ejected from the pilot burner 50, a flame holding for stable combustion of the premixed gas (premixed fuel) from the premix burner 60 can be performed.

[0059] (Regarding the rectifying plate (perforated plate) 100)

[0060] Figure 4 is a perspective view of the inner cylinder and the rectifying plate for several embodiments, viewed from the downstream side of the air passage. It should be noted that in Figure 4 the description of the holes 110 described later is omitted.

[0061] Figure 5 is an A-A cross-sectional view of the inner cylinder and the rectifying plate for several embodiments in Figure 3 .

[0062] Figure 6 is a view for explaining the holes of the rectifying plate for several embodiments.

[0063] In the following description, the radial direction centered on the central axis AX of the inner cylinder 47 is referred to as the radial direction of the burner 4, or simply the radial direction. Further, in the following description, the circumferential direction centered on the central axis AX of the inner cylinder 47 is referred to as the circumferential direction of the burner 4, or simply the circumferential direction.

[0064] The flow rectifying plate 100 of several embodiments is a perforated plate provided at the inlet portion of the air passage 43 and formed with a large number of holes 110 communicating the upstream side and the downstream side of the air passage 43. The flow rectifying plate 100 of several embodiments is an annular plate member configured to surround the periphery of the inner cylinder 47. In the flow rectifying plate 100 of several embodiments, ribs 161 for fixing the flow rectifying plate 100 are provided at equal intervals in the circumferential direction on the downstream side of the flow rectifying plate 100 in the air passage 43. The ribs 161 are radially arranged in a radial direction such that both ends thereof are in contact with a ring member 163 disposed opposite to the inner peripheral surface of the outer cylinder 45 and the inner cylinder 47. In the following description, the flow rectifying plate 100 is also referred to as the perforated plate 100.

[0065] The perforated plate 100 of several embodiments is joined to the outer peripheral portion of the inner cylinder 47 by welding, for example. That is, the radially inner end portion 101 of the perforated plate 100 of several embodiments is joined to the outer peripheral surface 47b of the inner cylinder 47 by welding.

[0066] In the burner 4 of several embodiments, the radially inner end portion 161a of the rib 161 is joined to the outer peripheral surface 47b of the inner cylinder 47 by fillet welding.

[0067] In the burner 4 of several embodiments, the radially outer end portion 161b of the rib 161 is joined to the inner peripheral surface 163a of the ring member 163 by fillet welding, for example.

[0068] The perforated plate 100 of several embodiments is joined to the rib 161 and the ring member 163 by welding at the fillet weld portion 165 between the end portion 161b of the rib 161 and the inner peripheral surface 163a of the ring member 163 in the radially outer end portion 103 vicinity of the surface 100d on the downstream side of the perforated plate 100 facing the air passage 43.

[0069] If it is fixedly arranged on the outer peripheral portion of the inner cylinder 47 like the perforated plate 100 of several embodiments, due to the combustion vibration during the operation of the gas turbine 1, it vibrates in such a manner that the region on the outer cylinder 45 side of the perforated plate 100 shakes with respect to the fixed portion on the inner cylinder 47 side of the perforated plate 100. Therefore, the stress acting on the perforated plate 100 due to this vibration increases from the radially outer side toward the radially inner side. Therefore, if such vibration of the perforated plate 100 occurs, the stress acting on the fixed portion on the inner cylinder 47 side of the perforated plate 100 increases, and deformation of the perforated plate 100 or breakage such that the holes 110 of the perforated plate 100 are connected to each other may occur.

[0070] In order to reduce such stress, consideration is given to reducing the opening ratio (the area of the holes 110 per unit area) of the holes 110 in the perforated plate 100, thereby increasing the area of the regions that are not the holes 110. However, in a rectifying plate, from the viewpoint of ensuring the air flow rate through the plurality of holes, it is preferable to increase the above-mentioned opening ratio.

[0071] Therefore, in several embodiments, the above-mentioned problem is solved by configuring the perforated plate 100 as follows. That is, in several embodiments, in the hole arrangement region 105 provided with a plurality of through-holes (holes 110), the region (inner region 108a) closer to the inner cylinder 47 side has a larger average value of the ligament ratio (P2 / P1) obtained by dividing the distance P2 between the outer peripheral edges 109 of two adjacent holes 110 among the plurality of through-holes (holes 110) by the center-to-center distance P1 of the two holes than the region (outer region 108b) closer to the outer cylinder 45 side. That is, in several embodiments, the perforated plate 100 is configured such that in the hole arrangement region 105 provided with a plurality of through-holes (holes 110), the average value of the ligament ratio (P2 / P1) becomes larger in the region (inner region 108a) closer to the inner cylinder 47 side than in the region (outer region 108b) closer to the outer cylinder 45 side.

[0072] The above structure will be described below.

[0073] In the perforated plate 100 of several embodiments, as described above, the plurality of ribs 161 are radially arranged. Therefore, in Figure 3 in the A-A direction view, the region where the holes 110 can be provided is the region between two circumferentially adjacent ribs 161 and between the outer peripheral surface 47b of the inner cylinder 47 and the inner peripheral surface 163a of the ring member 163. This partially annular region is referred to as the hole arrangement region 105 (see Figure 6 ).

[0074] The region in the hole arrangement region 105 closer to the inner cylinder 47 side is also referred to as the inner region 108a, and the region in the hole arrangement region 105 closer to the outer cylinder 45 side is also referred to as the outer region 108b.

[0075] For example, in Figure 6 , the region below the imaginary line Lv extending in the left-right direction in the drawing can be taken as the inner region 108a, or the region above the imaginary line Lv can be taken as the outer region 108b. It should be noted that the inner region 108a and the outer region 108b do not need to be adjacent to each other across the imaginary line Lv, and the inner region 108a and the outer region 108b can also be separated in the radial direction. In addition, in Figure 6In this case, a virtual line Lv is illustrated as a straight line extending in the left - right direction in the drawing, but the virtual line Lv may also be a curve. For example, the virtual line Lv may also be an arc shape centered on the central axis AX of the inner cylinder 47.

[0076] In addition, the value (P2 / P1) obtained by dividing the distance P2 between the outer peripheral edges 109 of two adjacent holes 110 among the plurality of holes 110 by the distance P1 between the centers of the two holes 110 is defined as the frame - hole ratio. Therefore, the larger the frame - hole ratio, the larger the distance P2 between the outer peripheral edges 109 of the two holes 110 relative to the distance P1 between the centers of the two adjacent holes 110. Thus, the proportion of the part equivalent to the frame rather than the holes 110 in the perforated plate 100 is larger. Therefore, the larger the frame - hole ratio, the smaller the opening ratio of the holes 110, but the area of the region that is not the holes 110 increases, and the strength of the perforated plate 100 becomes larger.

[0077] Therefore, as described above, by configuring the perforated plate 100 such that the average value of the frame - hole ratio (P2 / P1) of the inner - side region 108a is larger than that of the outer - side region 108b, compared with the perforated plate 100 of the outer - side region 108b, the proportion of the area of the region that is not the holes 110 per unit area in the inner - side region 108a becomes larger. Thus, the strength of the perforated plate 100 is improved. Thereby, while suppressing the influence on the opening ratio of the holes 110, the stress of the perforated plate 100, which has a tendency to increase from the radially outer side toward the radially inner side as described above, can be effectively alleviated.

[0078] In several embodiments, the perforated plate 100 may have a radial distribution in which the frame - hole ratio increases from the radially outer side toward the radially inner side in at least a part of the hole - arrangement region 105.

[0079] Thereby, in at least the above - mentioned part of the hole - arrangement region 105, as moving from the radially outer side toward the radially inner side, the proportion of the area of the region that is not the holes 110 per unit area of the perforated plate 100 becomes larger. Thus, the strength of the perforated plate 100 is improved. Therefore, while suppressing the influence on the opening ratio of the holes 110, the stress of the perforated plate 100, which has a tendency to increase from the radially outer side toward the radially inner side as described above, can be effectively alleviated.

[0080] In several embodiments, the perforated plate 100 has a plurality of support members (ribs 161) extending in the radial direction in the circumferential direction. The hole - arrangement region 105 is a partial - circular - ring - shaped region divided by adjacent support members (ribs 161) in the circumferential direction. As at least a part of the hole - arrangement region 105, the perforated plate 100 preferably has a radial distribution in which the frame - hole ratio increases from the radially outer side toward the radially inner side at the circumferential center of the above - mentioned partial - circular - ring - shaped region (hole - arrangement region 105).

[0081] Thus, at least in the circumferential center of the hole arrangement region 105, as moving from the radially outer side toward the radially inner side, the ratio of the area of the region of the perforated plate 100 that is not the hole 110 per unit area becomes larger, and thus the strength of the perforated plate 100 is improved. Therefore, while suppressing the influence on the aperture ratio of the hole 110, the stress of the perforated plate 100 that has a tendency to increase from the radially outer side toward the radially inner side as described above can be effectively alleviated.

[0082] It should be noted that in several embodiments, the perforated plate 100 may be configured as follows: in at least the circumferential center region 107 of the partial circular hole arrangement region 105 in which a plurality of through holes (holes 110) are arranged, it has a radial distribution in which the frame hole ratio (P2 / P1) increases from the radially outer side toward the radially inner side.

[0083] Thus, in at least the circumferential center region 107 of the hole arrangement region 105, as moving from the radially outer side toward the radially inner side, the ratio of the area of the region of the perforated plate 100 that is not the hole 110 per unit area becomes larger, and thus the strength of the perforated plate 100 is improved. Thus, while suppressing the influence on the aperture ratio of the hole 110, the stress of the perforated plate 100 that has a tendency to increase from the radially outer side toward the radially inner side as described above can be effectively alleviated.

[0084] It should be noted that in Figure 6 the illustrated embodiment, for each hole 110, in the hole arrangement region 105, multiple layers of columns of holes 110 arranged linearly in the illustrated left - right direction are arranged in the illustrated up - down direction.

[0085] More specifically, in Figure 6 the illustrated embodiment, the illustrated left - right direction coincides with the extending direction (tangent direction) of the tangent line at the circumferential central position of the hole arrangement region 105 within the tangent line of an imaginary circle (not shown) centered on the central axis AX of the inner cylinder 47. That is, in Figure 6 the illustrated embodiment, each hole 110 is arranged along this tangent direction.

[0086] Moreover, in Figure 6 the illustrated embodiment, it is configured such that the frame hole ratio in the lower three - layer columns within the columns of multiple layers of holes 110 is larger than the frame hole ratio in the upper four - layer columns within the columns of multiple layers of holes 110.

[0087] For example, in Figure 6In the illustrated embodiment, among the three holes 110 existing within the circle enclosed by the dashed line, the hole 110 on the left side in the illustration among the two holes 110 arranged in the above-mentioned tangential direction is referred to as the left hole 110L, and the hole 110 on the right side in the illustration among the two holes 110 arranged in the above-mentioned tangential direction is referred to as the right hole 110R. Additionally, among the three holes 110 existing within the circle enclosed by the dashed line, the hole 110 above the illustration of the two holes 110 arranged in the above-mentioned tangential direction is referred to as the upper hole 110U.

[0088] Regarding the three holes 110 existing within the circle enclosed by the dashed line, the aperture ratio (P2a / P1a) regarding the left hole 110L and the right hole 110R, the aperture ratio (P2b / Plb) regarding the left hole 110L and the upper hole 110U, and the aperture ratio (P2c / P1c) regarding the right hole 110R and the upper hole 110U can be the same.

[0089] Additionally, regarding the above three aperture ratios, one aperture ratio can be different from the other two aperture ratios, or all three aperture ratios can be different.

[0090] In several embodiments, in the perforated plate 100, it is preferable that the average value of the aperture ratio in the circumferential direction, i.e., the circumferential aperture ratio, increases from the radially outer side toward the radially inner side in at least a part of the hole arrangement region 105.

[0091] Thereby, in the above-mentioned part of the region, as moving from the radially outer side toward the radially inner side, the area of the region that is not the hole 110 becomes larger, and the strength of the perforated plate 100 is improved.

[0092] In several embodiments, in the perforated plate 100, it is preferable that the average value of the aperture ratio in the circumferential direction, i.e., the circumferential aperture ratio, increases from the radially outer side toward the radially inner side.

[0093] Thereby, even in the case where it is assumed that the aperture ratio decreases from the radially outer side toward the radially inner side in a part of the circumferential direction in the perforated plate 100, in the entire circumferential direction, the aperture ratio increases from the radially outer side toward the radially inner side. Thereby, in the entire circumferential direction, as moving from the radially outer side toward the radially inner side, the area of the region that is not the hole 110 becomes larger, and the strength of the perforated plate 100 is improved.

[0094] Figure 7A is an example of a graph showing the radial distribution of the aperture ratio, for example, showing Figure 6 the radial distribution of the aperture ratio in the illustrated embodiment. In Figure 7A the graph shown, the horizontal axis represents the radial position, and the vertical axis represents the aperture ratio.

[0095] Figure 7B is showing Figure 7A an example of a graph showing the radial distribution of the increase rate of the aperture ratio in the graph shown, for example, showingFigure 6 The radial distribution of the increase rate of the cell aperture ratio in the illustrated embodiment. In Figure 7B the illustrated graph, the horizontal axis represents the radial position, and the vertical axis represents the increase rate of the cell aperture ratio.

[0096] Here, the increase rate of the cell aperture ratio refers to the ratio of the change amount of the cell aperture ratio to the change amount of the radial position. More specifically, the increase rate of the cell aperture ratio refers to the ratio of the increase amount of the cell aperture ratio to the change amount of the radial position toward the radial inside.

[0097] It should be noted that in Figure 7A and Figure 7B the illustrated graph and each graph described later, the radial position of the radial inner end 105a of the hole arrangement region 105 (see Figure 6 ) is set to 0%, and the radial position of the radial outer end 105b of the hole arrangement region 105 is set to 100%.

[0098] As Figure 7A shown, for example, in Figure 6 the illustrated embodiment, with a certain boundary position in the radial direction as the boundary, the cell aperture ratio is different in the radial inner side and the radial outer side, but in the region closer to the radial inside than this boundary position, the cell aperture ratio is constant regardless of the position in the radial direction. Similarly, in the region closer to the radial outside than this boundary position, the cell aperture ratio is constant regardless of the position in the radial direction.

[0099] As Figure 7B shown, for example, in Figure 6 the illustrated embodiment, the increase rate of the cell aperture ratio is a relatively large positive value at the above-mentioned boundary position, but at other radial positions, its value is 0.

[0100] Figure 8A is another example of a graph showing the radial distribution of the cell aperture ratio. In Figure 8A the illustrated graph, the horizontal axis represents the radial position, and the vertical axis represents the cell aperture ratio.

[0101] Figure 8B is a graph showing Figure 8A an example of the radial distribution of the increase rate of the cell aperture ratio in the illustrated graph. In Figure 8B the illustrated graph, the horizontal axis represents the radial position, and the vertical axis represents the increase rate of the cell aperture ratio.

[0102] For example, in Figure 8A the illustrated graph, the cell aperture ratio increases linearly toward the radial inside. That is, in Figure 8A the illustrated graph, as Figure 8B shown, the increase rate of the cell aperture ratio is a positive constant value regardless of the position in the radial direction.

[0103] Figure 9A This is another example of a graph showing the radial distribution of the frame hole ratio. In Figure 9A the graph shown, the horizontal axis represents the radial position and the vertical axis represents the frame hole ratio.

[0104] Figure 9B This is a graph showing Figure 9A an example of the radial distribution of the increase rate of the frame hole ratio in the graph shown. In Figure 9B the graph shown, the horizontal axis represents the radial position and the vertical axis represents the increase rate of the frame hole ratio.

[0105] For example, in Figure 9A the graph shown, in each curve represented by a thin line and a thick line, as the direction approaches the radial inside, the frame hole ratio increases, and the proportion of its increase also increases as the direction approaches the radial inside.

[0106] In Figure 9A the curve represented by the thin line is, for example, Figure 9B the curve in the case where the increase rate of the frame hole ratio increases linearly as the direction approaches the radial inside, as represented by the thin solid line in

[0107] Figure 9A In Figure 9B the curve represented by the thick line is, for example, the curve in the case where the increase rate of the frame hole ratio increases as the direction approaches the radial inside and the proportion of its increase also increases as the direction approaches the radial inside, as represented by the thick solid line curve in

[0108] It should be noted that, for example, Figure 9B like the curves shown by the dashed line and the single-dot dash line in

[0109] Figure 10A the increase rate of the frame hole ratio does not increase monotonically as the direction approaches the radial inside, but is constant regardless of the radial position in a certain radial region. Figure 10A This is another example of a graph showing the radial distribution of the frame hole ratio. In

[0110] Figure 10B the graph shown, the horizontal axis represents the radial position and the vertical axis represents the frame hole ratio. Figure 10A This is an example of a graph showing the radial distribution of the increase rate of the frame hole ratio in Figure 10B the graph shown. In

[0111] For example, it can also be that, as Figure 10A shown, the frame hole ratio increases as the direction approaches the radial inside, but the proportion of its increase decreases as the direction approaches the radial inside.

[0112] For example, it may also be that, as Figure 10B shown, the increase rate of the cell aperture ratio decreases as it approaches the radially inner side while taking a positive value.

[0113] It should be noted that, regarding the increase rate of the cell aperture ratio, that is, the ratio (Δr / Δd) of the change amount Δr of the cell aperture ratio to the change amount Δd of the radial position, preferably, for example, as Figure 9B shown by the respective curves, the second ratio in the second radial range R2 closer to the radially inner side than the first radial range R1 is larger than the first ratio in the first radial range R1.

[0114] Thus, compared with the region closer to the radially outer side (for example, the first range R1), the above ratio (increase rate of the cell aperture ratio) of the region closer to the radially inner side (for example, the second range R2) becomes larger. Therefore, it is possible to ensure the above-mentioned opening ratio in the region closer to the radially outer side and ensure the flow rate of air passing through the plurality of holes 110, while increasing the strength of the perforated plate 100 in the region closer to the radially inner side.

[0115] In addition, preferably, for example Figure 9B shown by the solid line curve, the increase rate of the cell aperture ratio, that is, the ratio (Δr / Δd) of the change amount Δr of the cell aperture ratio to the change amount Δd of the radial position, gradually increases as it moves from the radially outer side toward the radially inner side.

[0116] Thus, as it approaches the radially inner side, the above ratio becomes larger. Therefore, it is possible to ensure the above-mentioned opening ratio in the region closer to the radially outer side and ensure the flow rate of air passing through the plurality of holes 110, while increasing the strength of the perforated plate 100 in the region closer to the radially inner side.

[0117] It should be noted that preferably, the increase rate of the cell aperture ratio gradually increases as it moves from the radially outer side toward the radially inner side at least in the circumferential central region 107.

[0118] It should be noted that when the radial position of the radially inner end 105a of the hole arrangement region 105 ( Figure 6 refer to) is set to 0% and the radial position of the radially outer end 105b of the hole arrangement region 105 is set to 100%, the cell aperture ratio in several embodiments may also be the following values.

[0119] For example, in the range where the radial position in the hole arrangement region 105 is 0% or more and 50% or less, the cell aperture ratio is preferably 0.10 or more.

[0120] For example, in the range where the radial position in the hole arrangement region 105 is 0% or more and 25% or less, the cell aperture ratio is preferably 0.11 or more.

[0121] For example, in the radial position within the hole configuration region 105 that is 0% or more and 12.5% or less, the frame hole ratio is preferably 0.15 or more.

[0122] (Regarding the opening ratio)

[0123] In the following description, the opening ratio of the holes 110 in the porous plate 100, more specifically, the opening ratio of the plurality of holes 110 in the hole configuration region 105, is a value obtained by summing the areas of the plurality of holes 110 per unit area of the hole configuration region 105 and expressing it as a percentage.

[0124] In several embodiments, the opening ratio of the plurality of holes 110 in the hole configuration region 105 is preferably 45% or more and 70% or less.

[0125] If the above opening ratio is less than 45%, it may have an adverse effect on the flow rate of air passing through the plurality of holes 110, that is, ensuring the amount of air required in the burner 4. In addition, if the above opening ratio exceeds 70%, it may have an adverse effect on the strength of the porous plate 100.

[0126] Therefore, by making the above opening ratio 45% or more and 70% or less, it is possible to ensure the flow rate of air passing through the plurality of holes 110 while ensuring the strength of the porous plate 100.

[0127] (Regarding the arrangement of the holes 110)

[0128] For example, as Figure 6 shown, in several embodiments, for each hole 110, it may be that the radial positions of two adjacent holes 110 in the circumferential direction are different, and multiple rows of holes 110 arranged linearly in the left - right direction in the drawing are arranged in multiple layers in the up - down direction in the drawing. That is, for example, as Figure 6 shown, in several embodiments, the plurality of holes 110 may also have a pair of holes 110 arranged adjacent to each other in the circumferential direction and having different radial positions.

[0129] Thereby, it is possible to make the arrangement density of the holes 110 relatively large and ensure the flow rate of air passing through the plurality of holes 110.

[0130] (Regarding the shape of the holes 110)

[0131] For example, as Figure 6 shown, in several embodiments, at least in the circumferential central region 107, the plurality of holes 110 are preferably circular holes.

[0132] If each hole 110 is a circular hole, it is easier to process compared to the case where each hole 110 is a square hole or the like.

[0133] (Regarding the size of the holes 110)

[0134] Figure 11 This is a diagram showing an example of another embodiment regarding the size of the hole 110.

[0135] In the perforated plate 100 of several embodiments, for example, as Figure 11 shown, the plurality of holes 110 may include a plurality of first holes 111 and at least one second hole 112 having an opening area larger than that of the first holes 111.

[0136] For example, in the embodiment Figure 11 shown, within the hole arrangement region 105 (see Figure 6 ), two layers of columns of the second holes 112 arranged linearly in the horizontal direction in the drawing are arranged in the vertical direction in the drawing. The number of the second holes 112 in the radially inner column is, for example, two, and the number of the second holes 112 in the radially outer column is, for example, four.

[0137] It should be noted that even when one of the two adjacent holes 110 is a first hole 111 and the other is a second hole 112, it is preferable that the frame hole ratio of these two holes 111 and 112 increases from the radially outer side toward the radially inner side in the radial distribution.

[0138] For example, it is preferable that, as in the embodiment Figure 11 shown, the centers C1 of at least a part of the plurality of first holes 111 are located at positions radially inside and radially outside the outer peripheral edge 109 within the circumferential range 141 where the opening edge (outer peripheral edge 109) of the second hole 112 exists.

[0139] Generally, the air flow through the hole with a relatively small opening area is more likely to maintain the speed in the radial central region of the air flow after flowing out of the hole than the air flow through the hole with a relatively large opening area. Therefore, for example, according to the embodiment Figure 11 shown, the first holes 111 with an opening area smaller than that of the second hole 112 are arranged radially outside and radially inside the second hole 112. Therefore, the difference in the flow velocity (pressure difference) between the air passing through the first holes 111 and the air passing through the second hole 112 becomes large, and a secondary flow is generated. Therefore, the mixing of the air passing through the first holes 111 and the air passing through the second hole 112 is promoted, and the uneven flow of air in the burner 4 can be suppressed.

[0140] For example, when the radial position of the radially inner end portion 105a of the hole arrangement region 105 ( Figure 6 see) is set to 0% and the radial position of the radially outer end portion 105b of the hole arrangement region 105 is set to 100%, the radial position of the center C2 of at least one second hole 112 preferably exists within the range of 25% or more and 75% or less.

[0141] When the radial position of the center C2 of at least one second hole 112 deviates from the above range, the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above may be insufficient.

[0142] Therefore, if it is configured such that the radial position of the center C2 of at least one second hole 112 is within the above range, the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above can be promoted, and the uneven flow of air in the burner 4 can be suppressed.

[0143] For example, the aperture of at least one second hole 112 is preferably 2.0 times or more and 3.0 times or less the aperture of the first hole 111.

[0144] If the aperture of the second hole 112 is less than 2.0 times the aperture of the first hole 111, the difference between the aperture of the second hole 112 and the aperture of the first hole 111 is small, and the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above may be insufficient.

[0145] In addition, if the aperture of the second hole 112 exceeds 3.0 times the aperture of the first hole 111, the difference in the flow velocity (pressure difference) between the air passing through the first hole 111 and the air passing through the second hole 112 becomes further larger. Therefore, the pressure loss caused by the generated secondary flow becomes larger, and the influence of this pressure loss cannot be ignored.

[0146] Therefore, if it is configured such that the aperture of at least one second hole 112 is 2.0 times or more and 3.0 times or less the aperture of the first hole 111, the influence of the pressure loss caused by the secondary flow can be suppressed while promoting the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above.

[0147] Figure 12 It is a diagram showing an example of another embodiment regarding the size of the hole 110.

[0148] Figure 13 It is a diagram showing an example of another embodiment regarding the size of the hole 110.

[0149] In the perforated plate 100 of several embodiments, for example, as Figure 12 shown, the plurality of holes 110 may also include a plurality of first holes 111, at least one second hole 112 having an opening area larger than the opening area of the first hole 111, and at least one third hole 113 having an opening area smaller than the opening area of the first hole 111.

[0150] In the perforated plate 100 of several embodiments, for example, as Figure 13As shown, the plurality of holes 110 may also include a plurality of first holes 111 and at least one third hole 113 having an opening area smaller than that of the first holes 111.

[0151] The aperture diameter of the third hole may, for example, also be 0.3 times or more and 0.8 times or less the aperture diameter of the first hole.

[0152] It should be noted that, for example, as Figure 12 shown, the third hole 113 is preferably disposed in Figure 11 the region of the perforated plate 100 shown where there are no first holes 111 and second holes 112. Additionally, for example, as Figure 13 shown, the third hole 113 is preferably disposed in Figure 6 the region of the perforated plate 100 shown where there are no first holes 111. Thereby, the opening area in the perforated plate 100 can be increased, and the flow rate of the compressed air passing through the perforated plate 100 can be increased.

[0153] It should be noted that even when one of two adjacent holes 110 is a first hole 111 and the other is a third hole 113, they may have a radial distribution in which the frame hole ratio of these two holes 111, 113 increases from the radially outer side toward the radially inner side.

[0154] Similarly, even when one of two adjacent holes 110 is a second hole 112 and the other is a third hole 113, they may have a radial distribution in which the frame hole ratio of these two holes 112, 113 increases from the radially outer side toward the radially inner side.

[0155] The burner 4 of several embodiments includes the perforated plate 100 of any of the above embodiments. Thereby, a burner 4 can be realized that ensures the amount of air passing through the perforated plate 100 while improving the durability of the perforated plate 100.

[0156] The gas turbine 1 of several embodiments includes the above burner 4. Thereby, the reliability of the gas turbine 1 can be improved.

[0157] The present disclosure is not limited to the above embodiments, and also includes modes obtained by deforming the above embodiments and modes obtained by appropriately combining these modes.

[0158] For example, the holes 110 of the above several embodiments may be arranged in the circumferential direction centered on the central axis AX of the inner cylinder 47, or may be randomly arranged.

[0159] The content described in the above respective embodiments can be understood as follows, for example.

[0160] (1) The perforated plate 100 of the gas turbine burner 4 according to at least one embodiment of the present disclosure is disposed between the inner cylinder 47 and the outer cylinder 45 of the gas turbine burner 4 and is fixedly arranged on the outer peripheral portion of the inner cylinder 47. In the hole arrangement region 105 of the perforated plate 100 where a plurality of through holes (holes 110) are provided, the average value of the frame hole ratio obtained by dividing the distance P2 between the outer peripheral edges 109 of two adjacent holes 110 among the plurality of through holes (holes 110) by the center-to-center distance P1 of the two holes is larger in the region closer to the inner cylinder 47 (inner region 108a) than in the region closer to the outer cylinder 45 (outer region 108b).

[0161] According to the structure of the above (1), in the hole arrangement region 105, the ratio of the area of the region that is not the hole 110 per unit area of the perforated plate 100 is larger in the region closer to the inner cylinder 47 (inner region 108a) than in the region closer to the outer cylinder 45 (outer region 108b). Therefore, the strength of the perforated plate 100 is improved. Thus, it is possible to effectively relieve the stress of the perforated plate 100 that has a tendency to increase from the radially outer side toward the radially inner side as described above while suppressing the influence on the opening ratio of the hole 110.

[0162] (2) In several embodiments, in the structure of the above (1), preferably, the perforated plate 100 has a radial distribution in which the frame hole ratio increases from the radially outer side toward the radially inner side in at least a part of the hole arrangement region 105.

[0163] According to the structure of the above (2), in at least the above-mentioned part of the hole arrangement region 105, as going from the radially outer side toward the radially inner side, the ratio of the area of the region that is not the hole 110 per unit area of the perforated plate 100 becomes larger. Therefore, the strength of the perforated plate 100 is improved. Thus, it is possible to effectively relieve the stress of the perforated plate 100 that has a tendency to increase as going from the radially outer side toward the radially inner side as described above while suppressing the influence on the opening ratio of the hole 110.

[0164] (3) In several embodiments, in the structure of the above (2), the perforated plate 100 has a plurality of support members (ribs 161) extending in the radial direction in the circumferential direction. The hole arrangement region 105 is a partial circular ring-shaped region divided by adjacent support members (ribs 161) in the circumferential direction. Preferably, the perforated plate 100 has the above-mentioned radial distribution at the circumferential center of the above-mentioned partial circular ring-shaped region as the above-mentioned part of the region.

[0165] According to the structure of (3) above, at least in the circumferential center of the hole arrangement region 105, as moving from the radially outer side toward the radially inner side, the ratio of the area of the region that is not the hole 110 per unit area of the perforated plate 100 becomes larger, and thus the strength of the perforated plate 100 is increased. Thereby, while suppressing the influence on the opening ratio of the hole 110, the stress of the perforated plate 100 that has a tendency to increase as moving from the radially outer side toward the radially inner side as described above can be effectively alleviated.

[0166] (4) In several embodiments, in the structure of (2) or (3) above, preferably, in the perforated plate 100, the average circumferential frame hole ratio, that is, the circumferential frame hole ratio, increases from the radially outer side toward the radially inner side in at least a part of the hole arrangement region 105.

[0167] According to the structure of (4) above, in the above-mentioned part of the region, as moving from the radially outer side toward the radially inner side, the area of the region that is not the hole 110 becomes larger, and the strength of the perforated plate 100 is increased.

[0168] (5) In several embodiments, in any of the structures of (2) to (4) above, preferably, the above-mentioned radial distribution is such that the ratio (Δr / Δd) of the change amount Δr of the frame hole ratio to the change amount Δd of the radial position is larger in the second radial range R2 closer to the radially inner side than the first ratio in the first radial range R1.

[0169] According to the structure of (5) above, the above-mentioned ratio (Δr / Δd) is larger in the region closer to the radially inner side than in the region closer to the radially outer side. Thereby, the above-mentioned opening ratio can be ensured in the region closer to the radially outer side to ensure the flow rate of the air passing through the plurality of holes 110, and at the same time, the strength of the perforated plate 100 can be increased in the region closer to the radially inner side.

[0170] (6) In several embodiments, in the structure of (5) above, preferably, the above-mentioned radial distribution is such that the above-mentioned ratio (Δr / Δd) gradually increases as moving from the radially outer side toward the radially inner side.

[0171] According to the structure of (6) above, as approaching the radially inner side, the above-mentioned ratio (Δr / Δd) becomes larger. Thereby, the above-mentioned opening ratio can be ensured in the region closer to the radially outer side to ensure the flow rate of the air passing through the plurality of holes 110, and at the same time, the strength of the perforated plate 100 can be increased in the region closer to the radially inner side.

[0172] (7) In several embodiments, in any of the structures of (1) to (6) above, preferably, the opening ratio of the plurality of through holes (holes 110) in the hole arrangement region 105 is 45% or more and 70% or less.

[0173] If the above-mentioned opening ratio is less than 45%, it may have an adverse effect on the flow rate of air passing through the plurality of holes 110, that is, ensuring the amount of air required in the burner 4. In addition, if the above-mentioned opening ratio exceeds 70%, it may have an adverse effect on the strength of the perforated plate 100.

[0174] According to the structure of the above-mentioned (7), it is possible to ensure the strength of the perforated plate 100 while ensuring the flow rate of air passing through the plurality of holes 110.

[0175] (8) In several embodiments, in any of the structures of the above-mentioned (1) to (7), preferably, the plurality of through holes (holes 110) have a pair of holes 110 arranged adjacent to each other in the circumferential direction and having different radial positions.

[0176] According to the structure of the above-mentioned (8), the arrangement density of the holes 110 can be relatively large, and the flow rate of air passing through the plurality of holes 110 can be ensured.

[0177] (9) In several embodiments, in any of the structures of the above-mentioned (1) to (8), preferably, the plurality of through holes (holes 110) include a plurality of first holes 111 and at least one second hole 112 having an opening area larger than that of the first holes 111. At least a part of the centers C1 of the plurality of first holes 111 are located at positions radially inside and radially outside the opening edge (outer peripheral edge 109) within the circumferential range 141 where the opening edge (outer peripheral edge 109) of the second hole 112 is present.

[0178] Generally, the air flow passing through a hole with a relatively small opening area is more likely to maintain the speed in the radial central region of the air flow after flowing out of the hole compared to the air flow passing through a hole with a relatively large opening area. According to the structure of the above-mentioned (9), the first holes 111 with an opening area smaller than that of the second hole 112 are arranged radially outside and radially inside the second hole 112, so the difference in flow velocity (pressure difference) between the air passing through the first holes 111 and the air passing through the second hole 112 becomes larger, generating a secondary flow. Therefore, the mixing of the air passing through the first holes 111 and the air passing through the second hole 112 is promoted, and the uneven flow of air in the burner 4 can be suppressed.

[0179] (10) In several embodiments, in the structure of the above-mentioned (9), preferably, when the radial position of the radially inner end 105a of the hole arrangement region 105 is set to 0% and the radial position of the radially outer end 105b of the hole arrangement region 105 is set to 100%, the radial position of the center C2 of at least one second hole 112 is within the range of 25% or more and 75% or less.

[0180] When the radial position of the center C2 of at least one second hole 112 deviates from the above range, the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above may be insufficient.

[0181] According to the structure of the above (10), the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above can be promoted, and the uneven flow of air in the burner 4 can be suppressed.

[0182] (11) In several embodiments, in the structure of the above (9) or (10), preferably, the aperture of at least one second hole 112 is 2.0 times or more and 3.0 times or less the aperture of the first hole 111.

[0183] If the aperture of the second hole 112 is less than 2.0 times the aperture of the first hole 111, the difference between the aperture of the second hole 112 and the aperture of the first hole 111 is small, and the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above may be insufficient.

[0184] In addition, if the aperture of the second hole 112 exceeds 3.0 times the aperture of the first hole 111, the difference in the flow velocity (pressure difference) between the air passing through the first hole 111 and the air passing through the second hole 112 further increases. Therefore, the pressure loss caused by the generated secondary flow becomes large, and the influence of this pressure cannot be ignored.

[0185] According to the structure of the above (11), while suppressing the influence of the pressure loss caused by the secondary flow, the mixing of the air passing through the first hole 111 and the air passing through the second hole 112 as described above can be promoted.

[0186] (12) The gas turbine burner 4 of at least one embodiment of the present disclosure includes the perforated plate 100 having the structure of any one of the above (1) to (11).

[0187] According to the structure of the above (12), a gas turbine burner 4 can be realized that can improve the durability of the perforated plate 100 while ensuring the air volume passing through the perforated plate 100.

[0188] (13) The gas turbine 1 of at least one embodiment of the present disclosure includes the gas turbine burner 4 having the structure of the above (12).

[0189] According to the structure of the above (13), the reliability of the gas turbine 1 can be improved.

[0190] Explanation of reference numerals:

[0191] 1... Gas turbine;

[0192] 4... Gas turbine burner (burner);

[0193] 43… Air passage;

[0194] 45… Outer cylinder;

[0195] 46… Burner liner;

[0196] 47… Inner cylinder;

[0197] 100… Rectifying plate (perforated plate);

[0198] 105… Hole configuration area;

[0199] 107… Circumferential central area;

[0200] 110… Through hole (hole);

[0201] 111… First hole;

[0202] 112… Second hole;

[0203] 113… Third hole.

Claims

1. A perforated plate of a gas turbine combustor, which is disposed between an inner cylinder and an outer cylinder of the gas turbine combustor and is fixedly arranged on the outer peripheral portion of the inner cylinder, wherein, in a region of the perforated plate where a plurality of through-holes are provided and which is closer to the inner cylinder side than a region closer to the outer cylinder side in a hole arrangement region, the average value of the frame hole ratio obtained by dividing the distance between the outer peripheral edges of two adjacent holes among the plurality of through-holes by the distance between the centers of the two holes is larger, the perforated plate has a radial distribution in which the frame hole ratio increases from the radially outer side toward the radially inner side in at least a part of the hole arrangement region, the radial distribution is such that, with respect to the ratio of the change amount of the frame hole ratio to the change amount of the radial position, the second ratio in a second radial range closer to the inner side than the first range is larger than the first ratio in a first radial range in the radial direction.

2. The perforated plate of the gas turbine combustor according to claim 1, wherein, the perforated plate has a plurality of support members extending in the radial direction in the circumferential direction, the hole arrangement region is a partial circular ring-shaped region circumferentially divided by adjacent support members, the perforated plate has the radial distribution in the circumferential center of the partial circular ring-shaped region as the part of the region.

3. The perforated plate of the gas turbine combustor according to claim 1, wherein, in the perforated plate, the average value of the circumferential frame hole ratio, that is, the circumferential frame hole ratio, increases from the radially outer side toward the radially inner side in the part of the region.

4. The perforated plate of the gas turbine combustor according to claim 1, wherein, the radial distribution is such that the ratio gradually increases from the radially outer side toward the radially inner side.

5. The perforated plate of the gas turbine combustor according to any one of claims 1 to 4, wherein, the opening ratio of the plurality of through-holes in the hole arrangement region is 45% or more and 70% or less.

6. The perforated plate of the gas turbine combustor according to any one of claims 1 to 4, wherein, the plurality of through-holes have a pair of holes arranged adjacent to each other in the circumferential direction and having different radial positions.

7. A perforated plate of a gas turbine combustor, which is disposed between an inner cylinder and an outer cylinder of the gas turbine combustor and is fixedly arranged on the outer peripheral portion of the inner cylinder, wherein, in a region of the perforated plate where a plurality of through-holes are provided and which is closer to the inner cylinder side than a region closer to the outer cylinder side in a hole arrangement region, the average value of the frame hole ratio obtained by dividing the distance between the outer peripheral edges of two adjacent holes among the plurality of through-holes by the distance between the centers of the two holes is larger, the plurality of through-holes include a plurality of first holes and at least one second hole having an opening area larger than that of the first holes, at least a part of the centers of the plurality of first holes are located at positions radially inside and radially outside the opening edge in the circumferential range where the opening edge of the second hole exists.

8. The perforated plate of the gas turbine combustor according to claim 7, wherein, When the radial position of the radially inner end of the hole arrangement region is set to 0% and the radial position of the radially outer end of the hole arrangement region is set to 100%, the radial position of the center of the at least one second hole exists within a range of 25% or more and 75% or less.

9. The perforated plate of a gas turbine burner according to claim 7 or 8, wherein the aperture of the at least one second hole is 2.0 times or more and 3.0 times or less the aperture of the first hole.

10. A gas turbine burner, wherein the gas turbine burner includes the perforated plate according to any one of claims 1 to 9.

11. A gas turbine, wherein the gas turbine includes the gas turbine burner according to claim 10.

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