Intake casing, axial flow compressor equipped with said intake casing, and gas turbine equipped with said axial flow compressor

Abstract

Reduces intake resistance. [Solution] The intake casing includes an intake chamber casing in which an annular inlet annular passage and an inlet passage capable of introducing air into the inlet annular passage from the outer periphery of the inlet annular passage are formed, a bellmouth in which an annular intake passage capable of introducing air from the inlet annular passage into a compressor casing is formed, a partition plate disposed in the inlet annular passage, and a plurality of struts disposed in the intake passage in a line in a circumferential direction with respect to the axis. The partition plate extends radially inward from the outer periphery of the inlet annular passage and divides the inlet annular passage into one side and the other side in the circumferential direction. The plurality of struts extend radially outward from the inner periphery of the intake passage to the outer periphery of the intake passage. The circumferential position of one of the plurality of struts is within ±2.5° in the circumferential direction with respect to the circumferential position of the partition plate.

Description

[Technical field]

[0001] The present disclosure relates to an intake casing, an axial compressor including the intake casing, and a gas turbine including the axial compressor. [Background technology]

[0002] The gas turbine has an axial compressor capable of compressing air to generate compressed air, a combustor capable of burning fuel in the compressed air to generate combustion gas, a turbine capable of being driven by the combustion gas, an intake casing, and an intermediate casing.

[0003] The axial flow compressor has a compressor rotor rotatable about an axis, a compressor casing that covers the compressor rotor, and an intake casing that guides air into the compressor casing. The turbine is disposed downstream of the compressor along the axis. The turbine has a turbine rotor rotatable about an axis, and a turbine casing that covers the turbine rotor. The turbine rotor is connected to the compressor rotor.

[0004] The intake casing is connected to an axially upstream end of the compressor casing so as to introduce air into the compressor casing. The intermediate casing is disposed between the compressor casing and the turbine casing in the axial direction. The combustor is attached to the intermediate casing so that compressed air discharged from the axial compressor into the intermediate casing can flow into the combustor.

[0005] The following Patent Document 1 describes an intake casing for an axial compressor. The intake casing has an intake chamber casing and a partition plate. The intake chamber casing is formed with an introduction annular flow passage annular around the axis, and an introduction flow passage capable of introducing air into the introduction annular flow passage from the outer periphery of the introduction annular flow passage. The partition plate is disposed in the introduction annular flow passage, in a region on the opposite side of the introduction flow passage with respect to the axis. The partition plate extends from the outer periphery of the annular introduction annular flow passage radially inward with respect to the axis, and divides the introduction annular flow passage into one side and the other side in the circumferential direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2012-207619 A Summary of the Invention [Problem to be solved by the invention]

[0007] The intake casing is required to reduce intake resistance and efficiently guide air into the main casing of the axial flow compressor.

[0008] Therefore, an object of the present disclosure is to provide an intake casing capable of suppressing intake resistance, an axial flow compressor including this intake casing, and a gas turbine including this axial flow compressor. [Means for solving the problem]

[0009] An intake casing as one aspect for achieving the above object is an intake casing capable of introducing air into a compressor casing that covers a compressor rotor that is rotatable about an axis. The intake casing includes an intake annular passage formed around the axis and an intake passage capable of introducing air into the intake annular passage from the outer periphery of the intake annular passage, a bell mouth formed with an intake passage that is annular around the axis and capable of introducing air from the intake annular passage into the compressor casing, a partition plate disposed in a region in the intake annular passage on the opposite side of the axis to the intake passage, and a plurality of struts disposed in the intake passage in a circumferential direction about the axis. The bell mouth is disposed on the downstream side of the axial upstream side and the downstream side in the axial direction in which the axis extends with respect to the intake chamber casing, and is connected to the intake chamber casing so that the intake passage and the intake annular passage can communicate with each other. The partition plate extends from the outer periphery of the annular intake annular passage radially inward with respect to the axis to partition the intake annular passage into one side and the other side in the circumferential direction. The struts each extend radially outward relative to the axis from an inner peripheral edge of the annular intake passage to an outer peripheral edge of the intake passage. The circumferential position of one of the struts is within ±2.5° in the circumferential direction relative to the circumferential position of the partition plate. None of the plurality of struts are connected to the partition plate and are separate from the partition plate.

[0010] The intake casing as another aspect for achieving the above object is an intake casing capable of introducing air into a compressor casing that covers a compressor rotor that is rotatable about an axis. The intake casing includes an intake annular passage formed around the axis and an intake passage capable of introducing air into the intake annular passage from the outer periphery of the intake annular passage, a bell mouth formed with an intake passage that is annular around the axis and capable of introducing air from the intake annular passage into the compressor casing, a partition plate disposed in a region in the intake annular passage on the opposite side of the axis to the intake passage, and a plurality of struts disposed in the intake passage in a circumferential direction about the axis. The bell mouth is disposed on the downstream side of the axial upstream side and the downstream side in the axial direction in which the axis extends with respect to the intake chamber casing, and is connected to the intake chamber casing so that the intake passage and the intake annular passage can communicate with each other. The partition plate extends from the outer periphery of the annular intake annular passage radially inward with respect to the axis to partition the intake annular passage into one side and the other side in the circumferential direction. The struts each extend radially outwardly with respect to the axis from an inner peripheral edge of the annular air intake passage to an outer peripheral edge of the air intake passage, and at least a portion of an existence region of one of the struts in the circumferential direction overlaps with an existence region of the partition plate in the circumferential direction. None of the plurality of struts are connected to the partition plate and are separate from the partition plate.

[0011] In the one aspect and the other aspect, when the air that flows from the introduction flow passage into the introduction annular flow passage and reaches the vicinity of the partition plate moves radially inward and toward the axial downstream side, that is, when the air flows into the intake flow passage, the struts in the intake flow passage hardly obstruct the flow of the air. Therefore, when the air that reaches the vicinity of the partition plate flows into the intake flow passage, almost no vortex flow of the air occurs. In other words, in the intake casing in the one aspect and the other aspect, the air flows smoothly from the intake chamber casing into the bell mouth. Therefore, in the intake casing in the one aspect and the other aspect, the air can be efficiently guided into the compressor casing of the compressor while suppressing the intake resistance.

[0012] An axial flow compressor according to one embodiment of the present invention for achieving the above object comprises: The compressor includes the intake casing according to the one aspect or the other aspect, the compressor rotor, and the compressor casing.

[0013] One aspect of a gas turbine for achieving the above object is as follows: The compressor comprises an axial flow compressor as one aspect of the above, a combustor capable of generating combustion gas by burning fuel in air compressed by the axial flow compressor, and a turbine capable of being driven by the combustion gas. Effect of the Invention

[0014] In one aspect of the present disclosure, intake resistance can be reduced. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic cross-sectional view of a gas turbine in an embodiment according to the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view of an intake casing in one embodiment according to the present disclosure. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view of an intake casing in a comparative example. [Diagram 5] 5 is a cross-sectional view taken along line VV in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of an intake casing, an axial flow compressor including this intake casing, and a gas turbine including this axial flow compressor according to the present disclosure will be described with reference to the drawings.

[0017] "Embodiments of an axial flow compressor and a gas turbine equipped with the axial flow compressor" Hereinafter, an embodiment of the gas turbine according to the present embodiment will be described with reference to FIG.

[0018] The gas turbine in this embodiment includes an axial compressor (hereinafter simply referred to as a compressor) 30 capable of compressing air A to generate compressed air Acom, a plurality of combustors 10 that combust fuel F in the compressed air Acom to generate combustion gas G, a turbine 20 driven by the high-temperature, high-pressure combustion gas G, an intermediate casing 5, a front bearing 2f, and a rear bearing 2b.

[0019] The compressor 30 has a compressor rotor 31 rotatable about an axis Ar, a compressor casing 32 covering the compressor rotor 31, a plurality of compressor stator vane rows 33, an intake air amount regulator 34, and an intake casing 40. The turbine 20 has a turbine rotor 21 rotatable about an axis Ar, a turbine casing 22 covering the turbine rotor 21, a plurality of turbine stator vane rows 23, and an exhaust casing 25.

[0020] In the following description, the direction in which the axis Ar extends is referred to as the axial direction Da, one side in the axial direction Da is referred to as the axial upstream side Dau, and the other side in the axial direction Da is referred to as the axial downstream side Dad. The circumferential direction centered on the axis Ar is simply referred to as the circumferential direction Dc. The direction perpendicular to the axis Ar is referred to as the radial direction Dr, and the side of the radial direction Dr that approaches the axis Ar is referred to as the radial inner side Dri, and the opposite side is referred to as the radial outer side Dro.

[0021] The compressor 30 is disposed on the axial upstream side Dau with respect to the turbine 20. The compressor rotor 31 has a compressor rotor shaft 31s extending in the axial direction Da centered on the axis Ar, and a plurality of compressor rotor blade rows 31b attached to the compressor rotor shaft 31s. The plurality of compressor rotor blade rows 31b are arranged in the axial direction Da. Each compressor rotor blade row 31b is composed of a plurality of rotor blades arranged in the circumferential direction Dc. On the axial downstream side Dad of each of the plurality of compressor rotor blade rows 31b, one of the plurality of compressor stator vane rows 33 is disposed. Each compressor stator vane row 33 is attached to the inside of the compressor casing 32. Each compressor stator vane row 33 is composed of a plurality of stator vanes arranged in the circumferential direction Dc. The intake air regulator 34 has a plurality of inlet guide vanes 34v and a driver 34d that can change the direction of each of the inlet guide vanes 34v. The inlet guide vanes 34v are arranged on the axially upstream side Dau of the compressor rotor blade rows 31b. The inlet guide vanes 34v are arranged side by side in the circumferential direction Dc.

[0022] The intake casing 40 is disposed on the axial upstream side Dau of the compressor casing 32 and is connected to an end of the axial upstream side Dau of the compressor casing 32. The intake casing 40 is configured to be able to introduce air A from the outside into the compressor casing 32.

[0023] The turbine rotor 21 has a turbine rotor shaft 21s extending in an axial direction Da about an axis Ar, and a plurality of turbine rotor blade rows 21b attached to the turbine rotor shaft 21s. The plurality of turbine rotor blade rows 21b are aligned in the axial direction Da. Each turbine rotor blade row 21b is composed of a plurality of rotor blades aligned in a circumferential direction Dc. On the axial upstream side Dau of each of the plurality of turbine rotor blade rows 21b, one of the plurality of turbine stator blade rows 23 is disposed. Each turbine stator blade row 23 is attached to the inside of the turbine casing 22. Each turbine stator blade row 23 is composed of a plurality of stator blades aligned in the circumferential direction Dc.

[0024] The exhaust casing 25 is connected to an end of the turbine casing 22 on the axial upstream side Dau. The exhaust casing 25 has an exhaust inner casing 25i, an exhaust outer casing 25o, and a plurality of exhaust struts 26. The exhaust inner casing 25i is cylindrical about the axis Ar and covers a portion of the turbine rotor shaft 21s on the axial downstream side Dad of the plurality of turbine blade rows 21b. The exhaust outer casing 25o is cylindrical about the axis Ar and is disposed at a distance from the exhaust inner casing 25i on the radial outer side Dro. The axial upstream end Dau of the exhaust outer casing 25o is connected to an end of the turbine casing 22 on the axial downstream side Dad. The space between the exhaust inner casing 25i and the exhaust outer casing 25o in the radial direction Dr forms an exhaust passage through which exhaust gas, which is the combustion gas G exhausted from the turbine casing 22, flows. The exhaust struts 26 are arranged in the circumferential direction Dc between the exhaust inner casing 25i and the exhaust outer casing 25o. The radially inner ends Dri of the exhaust struts 26 are connected to the exhaust inner casing 25i. The radially outer ends Dro of the exhaust struts 26 are connected to the exhaust outer casing 25o.

[0025] The intermediate casing 5 is disposed between the compressor casing 32 of the compressor 30 and the turbine casing 22 in the axial direction Da. An end on the axial upstream side Dau of the intermediate casing 5 is connected to an end on the axial downstream side Dad of the compressor casing 32. An end on the axial downstream side Dad of the intermediate casing 5 is connected to an end on the axial upstream side Dau of the turbine casing 22. The multiple combustors 10 are attached to the intermediate casing 5 aligned in the circumferential direction Dc.

[0026] The compressor rotor 31 and the turbine rotor 21 are located on the same axis Ar and are connected to each other to form a gas turbine rotor 1. For example, a rotor of a generator GEN is connected to this gas turbine rotor 1. An axial upstream portion Dau of the gas turbine rotor 1 is rotatably supported by a front bearing 2f. An axial downstream portion Dad of the gas turbine rotor 1 is rotatably supported by a rear bearing 2b. The front bearing 2f is disposed at a position in the axial direction Da where the intake casing 40 exists. The rear bearing 2b is disposed at a position in the axial direction Da where multiple exhaust struts 26 exist. This rear bearing 2b is supported by the multiple exhaust struts 26 via an exhaust inner casing 25i.

[0027] The compressor 30 draws in air A and compresses the air A. The compressed air A, i.e., compressed air Acom, flows from the compressor 30 into the intermediate casing 5. The compressed air Acom flows into the multiple combustors 10 attached to the intermediate casing 5. Fuel F is supplied from the outside into the multiple combustors 10. In the multiple combustors 10, the fuel F is combusted in the compressed air Acom, and high-temperature, high-pressure combustion gas G is generated. This combustion gas G flows into the turbine casing 22. The turbine rotor 21 is rotated by the combustion gas G that has flowed into the turbine casing 22. The combustion gas G exhausted from the turbine casing 22 is exhausted to the outside via the exhaust casing 25 as exhaust gas.

[0028] "Embodiment of Intake Casing" The above-described intake casing 40 will be described in detail below with reference to FIGS.

[0029] As shown in Figures 2 and 3, the intake casing 40 in this embodiment comprises an intake chamber casing 41 into which air A can flow from the outside, a bellmouth 51 into which air A from the intake chamber casing 41 can be introduced into the compressor casing 32, a partition plate 47 arranged in the intake casing 40, and a plurality of intake struts (hereinafter simply referred to as struts) 56 arranged in the bellmouth 51.

[0030] The intake chamber casing 41 is formed with an introduction annular passage 43 annular about the axis Ar, and an introduction passage 42 capable of introducing air A into the introduction annular passage 43 from the outer periphery of the introduction annular passage 43. The introduction passage 42 is on the outer periphery of the introduction annular passage 43, is located above the introduction annular passage 43, and extends in the vertical direction. Thus, the introduction passage 42 is disposed vertically above the axis Ar. The vertical upper edge of the introduction passage 42 forms an intake port 42i through which air A flows in from the outside.

[0031] The intake chamber casing 41 has a front plate 44 that defines the edge of the axial upstream side Dau of the introduction flow passage 42 and the introduction annular flow passage 43, a rear plate 45 that defines the edge of the axial downstream side Dad of the introduction flow passage 42, and a side peripheral plate 46 that defines the edge of the side peripheral of the introduction flow passage 42 and the introduction annular flow passage 43. The front plate 44 and the rear plate 45 are arranged at an interval in the axial direction Da. The side peripheral plate 46 connects the side peripheral edge of the front plate 44 and the side peripheral edge of the rear plate 45. The above-mentioned intake port 42i is defined by the upper edge of the front plate 44, the upper edge of the rear plate 45, and the upper edge of the side peripheral plate 46. The front plate 44 has a circular opening 44o centered on the axis Ar. The rear plate 45 also has a circular opening 45o centered on the axis Ar. The radius of the circular opening 45 o of the rear plate 45 is larger than the radius of the circular opening 44 o of the front plate 44 .

[0032] The bellmouth 51 is formed with an intake passage 52 that is annular about the axis Ar and capable of guiding air A from the introduction annular passage 43 into the compressor casing 32. The bellmouth 51 is disposed on the axial downstream side Dad of the intake chamber casing 41, and is connected to the intake chamber casing 41 so that the intake passage 52 and the introduction annular passage 43 in the intake chamber casing 41 can communicate with each other.

[0033] The bell mouth 51 has an inner bell mouth 54 that defines an inner peripheral edge 52i of the annular intake passage 52, and an outer bell mouth 55 that defines an outer peripheral edge 52o of the annular intake passage 52. The inner bell mouth 54 is cylindrical about the axis Ar and covers the portion of the compressor rotor shaft 31s that is on the axial upstream side Dau from the inlet guide vane 34v. This inner bell mouth 54 is formed so as to gradually move toward the radially outer side Dro as it moves toward the axial upstream side Dau. The edge of the axial upstream side Dau of the inner bell mouth 54 is connected to the edge of the opening 44o of the front plate 44. The outer bell mouth 55 is cylindrical about the axis Ar and is disposed at a distance from the inner bell mouth 54 on the radially outer side Dro. This outer bell mouth 55 is also formed so as to gradually move toward the radially outer side Dro as it moves toward the axial upstream side Dau. The edge of the axial upstream side Dau of the outer bell mouth 55 is connected to the edge of the opening 45o of the rear plate 45. In addition, the edge of the axial downstream side Dad of the outer bell mouth 55 is connected to the edge of the axial upstream side Dau of the compressor casing 32. The outer peripheral edge 43o of the introduction annular passage 43 is located radially outward Dro of the outer peripheral edge 52o of the intake passage 52 at the connection position of the bell mouth 51 with the intake chamber casing 41. In other words, the outer peripheral edge 43o of the introduction annular passage 43 is located radially outward Dro of the edge of the axial upstream side Dau of the outer bell mouth 55.

[0034] The multiple struts 56 are arranged side by side in the circumferential direction Dc relative to the axis Ar in the intake passage 52. The radially inner edge Dri of each strut 56 is connected to the inner bellmouth 54. Moreover, the radially outer edge Dro of each strut 56 is connected to the outer bellmouth 55. That is, the multiple bellmouths 51 each extend radially outward Dro from an inner peripheral edge 52i of the annular intake passage 52 to an outer peripheral edge 52o of the intake passage 52.

[0035] The front bearing 2f described above is disposed on the inner peripheral side of the inner bellmouth 54 and attached to this inner bellmouth 54. This front bearing 2f is supported by a plurality of struts 56 via the inner bellmouth 54.

[0036] The partition plate 47 is disposed in the inlet annular passage 43 in a region opposite to the inlet passage 42 with respect to the axis Ar. In this embodiment, the partition plate 47 is disposed vertically below the axis Ar. This partition plate 47 extends radially inward Dri from the outer peripheral edge 43o of the annular inlet annular passage 43 to a position within the position of the outer peripheral edge 52o of the intake passage 52, and divides the inlet annular passage 43 into one side and the other side in the circumferential direction Dc. For this reason, the edge 47i of the radially inward Dri of the partition plate 47, that is, the upper edge of the partition plate 47, is located at the position of the edge of the axial downstream side Dad of the outer bell mouth 55 in the radial direction Dr, or is located radially outward Dro from the position of the edge of the axial downstream side Dad of the outer bell mouth 55. The edge 47u of the axial upstream side Dau of the partition plate 47 is connected to the front plate 44. An edge 47o of the partition plate 47 on the radially outer side Dro, i.e., the lower edge of the partition plate 47, is connected to the side peripheral plate 46. An edge 47d of the partition plate 47 on the axial downstream side Dad is connected to the rear plate 45. An edge 47i of the partition plate 47 on the radially inner side Dri, i.e., the upper edge of the partition plate 47, is not connected to any member.

[0037] The maximum thickness of the partition plate 47, i.e., the maximum thickness of the partition plate 47 in the circumferential direction Dc, is thinner than the maximum thickness of each strut 56, i.e., the maximum width of each strut 56 in the circumferential direction Dc. For this reason, the rigidity of the partition plate 47 is lower than the rigidity of each strut 56. A reinforcing beam 48 is provided on the surface of the partition plate 47 facing the circumferential direction Dc. The reinforcing beam 48 extends from a position on the axial downstream side Dad and on the radially outer side Dro of the partition plate 47 to a position on the axial upstream side Dau and on the radially inner side Dri of the partition plate 47.

[0038] 3, the position in the circumferential direction Dc of one strut 56a among the multiple struts 56 is within a range of a predetermined angle α in the circumferential direction Dc with respect to the position in the circumferential direction Dc of the partition plate 47. This predetermined angle is ±2.5°. Furthermore, at least a part of the existence region of this one strut 56a in the circumferential direction Dc is an overlap region 57 that overlaps in the circumferential direction Dc with the existence region of the partition plate 47 in the circumferential direction Dc.

[0039] Next, the effects of the intake casing 40 in this embodiment will be described while describing an intake casing 40C in a comparative example shown in FIG. 4 and FIG.

[0040] Like the intake casing 40 in this embodiment, the intake casing 40C in the comparative example also includes an intake chamber casing 41, a bellmouth 51, a partition plate 47, and a plurality of struts 56. However, the relative position in the circumferential direction Dc of one of the plurality of struts 56 with respect to the partition plate 47 is different between the intake casing 40 in this embodiment and the intake casing 40C in the comparative example. Furthermore, the position of an edge 47i of the radially inner side Dri of this partition plate 47, i.e., the position of the upper edge of the partition plate 47, is also different between the intake casing 40 in this embodiment and the intake casing 40C in the comparative example.

[0041] In the intake casing 40C of the comparative example, the position in the circumferential direction Dc of one of the multiple struts 56 is outside the range of a predetermined angle α in the circumferential direction Dc with respect to the position in the circumferential direction Dc of the partition plate 47. Furthermore, the presence region of this one strut 56 in the circumferential direction Dc does not overlap at all with the presence region of the partition plate 47 in the circumferential direction Dc.

[0042] 5, in the intake casing 40C of the comparative example, when the air A that has flowed from the introduction passage 42 into the introduction annular passage 43 and reached the vicinity of the partition plate 47 moves toward the radially inner side Dri and the axial downstream side Dad, that is, when the air A flows into the intake passage 52, the struts 56 in the intake passage 52 become an obstacle to the flow of the air A. Therefore, when the air A that has flowed near the partition plate 47 flows into the intake passage 52, a vortex flow of the air A occurs. Therefore, in the intake casing 40C of the comparative example, the vortex flow increases the intake resistance.

[0043] On the other hand, in the intake casing 40 of this embodiment, as shown in FIG. 3, when the air A that has flowed into the inlet annular passage 43 from the inlet passage 42 and reached the vicinity of the partition plate 47 moves toward the radially inner side Dri and the axial downstream side Dad, that is, when the air A flows into the intake passage 52, the struts 56 in the intake passage 52 hardly obstruct the flow of the air A. Therefore, when the air A that has flowed into the vicinity of the partition plate 47 flows into the intake passage 52, almost no vortex flow of the air A occurs. That is, in the intake casing 40 of this embodiment, the air A flows smoothly from the intake chamber casing 41 into the bell mouth 51. Therefore, in the intake casing 40 of this embodiment, the air A can be efficiently guided into the compressor casing 32 of the compressor 30 while suppressing the intake resistance.

[0044] The partition plate 47 in the comparative example extends from the outer peripheral edge 43o of the annular inlet annular flow passage 43 to a position Dri that is radially inward from the position of the outer peripheral edge 52o of the intake flow passage 52. For this reason, the edge 47i of the radially inner Dri of the partition plate 47 in the comparative example, i.e., the upper edge of the partition plate 47, is located radially inward Dri from the position of the edge of the outer bell mouth 55 on the axial downstream side Dad.

[0045] Therefore, the distance from the edge 47o of the radially outer side Dro of the partition plate 47 connected to the side peripheral plate 46, i.e., the lower edge of the partition plate 47, to the edge 47i of the radially inner side Dri of the partition plate 47 not connected to any member, i.e., the upper edge of the partition plate 47, is shorter in the partition plate 47 in this embodiment than in the partition plate 47 in the comparative example. Therefore, the moment acting on the edge 47o of the radially outer side Dro of the partition plate 47 connected to the side peripheral plate 46, i.e., the lower edge of the partition plate 47, which is the base point, on the edge 47i of the radially inner side Dri of the partition plate 47, i.e., the upper edge of the partition plate 47, is smaller in the partition plate 47 in this embodiment than in the partition plate 47 in the comparative example. Therefore, in the partition plate 47 in this embodiment, damage to the edge 47i of the radially inner side Dri of the partition plate 47, i.e., the upper edge of the partition plate 47, can be suppressed. Furthermore, in the partition plate 47 of this embodiment, damage to the radially inner portion Dri of the connection portion between the front plate 44 and the edge 47u of the axial upstream side Dau of the partition plate 47, and damage to the radially inner portion Dri of the connection portion between the rear plate 45 and the edge 47d of the axial downstream side Dad of the partition plate 47 can be suppressed.

[0046] "Variations" In the above embodiment, the partition plate 47 is disposed immediately below the axis Ar. However, the partition plate 47 does not have to be disposed immediately below the axis Ar as long as it is disposed in a region on the opposite side of the introduction flow passage 42 with respect to the axis Ar.

[0047] In the above embodiment, the introduction flow passage 42 is located on the outer periphery of the introduction annular flow passage 43, above the introduction annular flow passage 43, and extends in the vertical direction. However, the introduction flow passage 42 may be located on the outer periphery of the introduction annular flow passage 43, laterally of the introduction annular flow passage 43, and extend in the lateral direction.

[0048] Furthermore, the present disclosure is not limited to the embodiments described above. Various additions, modifications, substitutions, partial deletions, etc. are possible within the scope of the conceptual idea and intent of the present invention derived from the contents defined in the claims and their equivalents.

[0049] "Additional Notes" The intake casing 40 in each of the above embodiments can be understood, for example, as follows. (1) In the first embodiment, the intake casing 40 is an intake casing capable of introducing air A into a compressor casing 32 that covers a compressor rotor 31 that is rotatable around an axis Ar. The intake casing 40 comprises an intake chamber casing 41 in which an intake annular passage 43 is formed around the axis Ar and an intake passage 42 capable of introducing air A into the intake annular passage 43 from the outer circumferential side of the intake annular passage 43, a bellmouth 51 in which an intake passage 52 is formed around the axis Ar and capable of introducing air A from the intake annular passage 43 into the compressor casing 32, a partition plate 47 arranged in a region within the intake annular passage 43 on the opposite side to the intake passage 42 with respect to the axis Ar, and a plurality of struts 56 arranged in the intake passage 52 in a circumferential direction Dc relative to the axis Ar. The bellmouth 51 is disposed on the axial downstream side Dad of the axial upstream side Dau and the axial downstream side Dad in the axial direction Da along which the axis Ar extends with respect to the intake chamber casing 41, and is connected to the intake chamber casing 41 so that the intake passage 52 and the introduction annular passage 43 can communicate with each other. The partition plate 47 extends from an outer peripheral edge 43o of the annular introduction annular passage 43 toward a radially inner side Dri with respect to the axis Ar, and divides the introduction annular passage 43 into one side and the other side in the circumferential direction Dc. The struts 56 each extend from an inner peripheral edge 52i of the annular intake passage 52 to an outer peripheral edge 52o of the intake passage 52 toward a radially outer side Dro with respect to the axis Ar. Of the plurality of struts 56, the position of one strut 56a in the circumferential direction Dc is within ±2.5° in the circumferential direction Dc with respect to the position of the partition plate 47 in the circumferential direction Dc.

[0050] In this embodiment, when the air A, which has flowed into the inlet annular passage 43 from the inlet passage 42, approaches the partition plate 47 toward the radially inner side Dri and the axial downstream side Dad, that is, when the air A flows into the intake passage 52, the struts 56a in the intake passage 52 hardly obstruct the flow of the air A. Therefore, when the air A, which has flowed into the vicinity of the partition plate 47, flows into the intake passage 52, almost no vortex flow of the air A occurs. In other words, in the intake casing 40 in this embodiment, the air A flows smoothly from the intake chamber casing 41 into the bell mouth 51. Therefore, in the intake casing 40 in this embodiment, the air A can be efficiently guided into the compressor casing 32 of the compressor 30 while suppressing the intake resistance.

[0051] (2) In the second embodiment, the intake casing 40 is an intake casing capable of introducing air A into the compressor casing 32 that covers the compressor rotor 31 that is rotatable around the axis Ar. The intake casing 40 comprises an intake chamber casing 41 in which an intake annular passage 43 is formed around the axis Ar and an intake passage 42 capable of introducing air A into the intake annular passage 43 from the outer circumferential side of the intake annular passage 43, a bellmouth 51 in which an intake passage 52 is formed around the axis Ar and capable of introducing air A from the intake annular passage 43 into the compressor casing 32, a partition plate 47 arranged in a region within the intake annular passage 43 on the opposite side to the intake passage 42 with respect to the axis Ar, and a plurality of struts 56 arranged in the intake passage 52 in a circumferential direction Dc relative to the axis Ar. The bellmouth 51 is disposed on the axial downstream side Dad of the axial upstream side Dau and the axial downstream side Dad in the axial direction Da along which the axis Ar extends with respect to the intake chamber casing 41, and is connected to the intake chamber casing 41 so that the intake passage 52 and the introduction annular passage 43 can communicate with each other. The partition plate 47 extends from an outer peripheral edge 43o of the annular introduction annular passage 43 toward a radially inner side Dri with respect to the axis Ar, and divides the introduction annular passage 43 into one side and the other side in the circumferential direction Dc. The struts 56 each extend from an inner peripheral edge 52i of the annular intake passage 52 to an outer peripheral edge 52o of the intake passage 52 toward a radially outer side Dro with respect to the axis Ar. At least a portion of an area in the circumferential direction Dc of one strut 56a among the plurality of struts 56 overlaps in the circumferential direction Dc with an area in the circumferential direction Dc of the partition plate 47.

[0052] In this embodiment, when the air A, which has flowed into the inlet annular passage 43 from the inlet passage 42, approaches the partition plate 47 toward the radially inner side Dri and the axial downstream side Dad, that is, when the air A flows into the intake passage 52, the struts 56 in the intake passage 52 hardly obstruct the flow of the air A. Therefore, when the air A, which has flowed into the vicinity of the partition plate 47, flows into the intake passage 52, almost no vortex flow of the air A occurs. In other words, in the intake casing 40 in this embodiment, the air A flows smoothly from the intake chamber casing 41 into the bell mouth 51. Therefore, in the intake casing 40 in this embodiment, the air A can be efficiently guided into the compressor casing 32 of the compressor 30 while suppressing the intake resistance.

[0053] (3) The intake casing 40 in the third embodiment is In the intake casing 40 in the first or second embodiment, the outer peripheral edge 43o of the introduction annular passage 43 is located radially outward Dro of the outer peripheral edge 52o of the intake passage 52 at the connection position of the bell mouth 51 with the intake chamber casing 41. The partition plate 47 extends radially outward from the outer peripheral edge 43o of the introduction annular passage 43 to a position within the position of the outer peripheral edge 52o of the intake passage 52 at the connection position. Medial Dri It has been extended to.

[0054] Here, a comparative example is an example in which the partition plate 47 extends from the outer peripheral edge 43o of the introduction annular passage 43 radially inward Dri of the position of the outer peripheral edge 52o of the intake passage 52. In this embodiment, the moment acting on the edge 47i of the radially inward Dri of the partition plate 47, with the edge 47o of the radially outward Dro of the partition plate 47 as the base point, is smaller than in the comparative example. Therefore, in this embodiment, damage around the edge 47i of the radially inward Dri of the partition plate 47 can be suppressed.

[0055] (4) The intake casing 40 in the fourth aspect is In the intake casing 40 according to any one of the first to third embodiments, the rigidity of the partition plate 47 is lower than the rigidity of each of the plurality of struts 56 .

[0056] The axial flow compressor 30 in each of the above embodiments can be understood, for example, as follows. (5) The axial flow compressor 30 in the fifth aspect is The compressor has an intake casing 40 according to any one of the first to fourth aspects, the compressor rotor 31, and the compressor casing 32.

[0057] The gas turbine in each of the above embodiments can be understood, for example, as follows. (6) A gas turbine in a sixth aspect, The compressor includes an axial compressor 30 according to the fifth aspect, a combustor 10 capable of burning fuel F in air compressed by the axial compressor 30 to generate combustion gas G, and a turbine 20 capable of being driven by the combustion gas G. [Explanation of symbols]

[0058] 1: Gas turbine rotor 2f: Front bearing 2b: Rear bearing 5: Intermediate casing 10: Combustor 20: Turbine 21: Turbine rotor 21s: Turbine rotor shaft 21b: Turbine blade row 22: Turbine casing 23: Turbine stator blade row 25: Exhaust casing 25i: Exhaust inner casing 25o: Exhaust outer casing 26: Exhaust strut 30: Axial flow compressor (or simply compressor) 31: Compressor rotor 31s: Compressor rotor shaft 31b: Compressor blade row 32: Compressor casing 33: Compressor stator blade row 34: Intake volume regulator 34v: Inlet guide vane 34d: Driver 40, 40C: Intake casing 41: Intake chamber casing 42: Inlet channel 42i: Air intake 43: Inlet annular passage 43o: (the outer periphery of the inlet annulus) 44: Front panel 44o: opening 45: Rear plate 45o: opening 46: Side circumferential plate 47: Partition 47i: (diametric inner edge of partition plate) 47o: (radial outer edge of partition plate) 47u: (upstream edge of the axis of the partition plate) 47d: (Downstream edge of the axis of the partition plate) 48: Reinforcement beam 51: Bellmouth 52: Intake passage 52i: Inner edge of intake passage 52o: Outer edge of intake passage 54: Inner bell mouth 55: Outer bell mouth 56, 56a: Intake strut (or simply strut) 57: Overlap area A: Air Acom: Compressed air F:Fuel G: Combustion gas Ar: Axis line Da: Axial direction Dau: Axis upstream side Dad: Downstream of axis Dc: Circumferential direction Dr: Radial direction Dri: Radial inner direction Dro: Radial outer side

Claims

1. In an intake casing capable of introducing air into a compressor casing that covers a compressor rotor that is rotatable about an axis, an intake annular passage formed around the axis and an intake passage capable of introducing air into the intake annular passage from an outer circumferential side of the intake annular passage; a bell mouth having an intake passage formed annularly around the axis and capable of introducing air from the introduction annular passage into the compressor casing; a partition plate disposed in a region of the inlet annular passage on an opposite side of the inlet passage with respect to the axis; a plurality of struts arranged in a circumferential direction about the axis in the intake passage; Equipped with the bell mouth is disposed on the axial downstream side of an axial upstream side and an axial downstream side with respect to the intake chamber casing in an axial direction in which the axis extends, and is connected to the intake chamber casing so as to enable communication between the intake flow path and the introduction annular flow path, the partition plate extends radially inward with respect to the axis from an outer circumferential edge of the annular inlet annular passage and divides the inside of the inlet annular passage into one side and the other side in the circumferential direction, Each of the struts extends radially outward relative to the axis from an inner circumferential edge of the annular intake passage to an outer circumferential edge of the intake passage, a circumferential position of one of the struts is within ±2.5° in the circumferential direction with respect to a circumferential position of the partition plate, None of the plurality of struts are connected to the partition plate and are separate from the partition plate. Intake casing.

2. In an intake casing capable of introducing air into a compressor casing that covers a compressor rotor that is rotatable about an axis, an intake annular passage formed around the axis and an intake passage capable of introducing air into the intake annular passage from an outer circumferential side of the intake annular passage; a bell mouth having an intake passage formed annularly around the axis and capable of introducing air from the introduction annular passage into the compressor casing; a partition plate disposed in a region of the inlet annular passage on an opposite side of the inlet passage with respect to the axis; a plurality of struts arranged in a circumferential direction about the axis in the intake passage; Equipped with the bell mouth is disposed on the axial downstream side of an axial upstream side and an axial downstream side with respect to the intake chamber casing in an axial direction in which the axis extends, and is connected to the intake chamber casing so as to enable communication between the intake flow path and the introduction annular flow path, the partition plate extends radially inward with respect to the axis from an outer circumferential edge of the annular inlet annular passage and divides the inside of the inlet annular passage into one side and the other side in the circumferential direction, Each of the struts extends radially outward relative to the axis from an inner circumferential edge of the annular intake passage to an outer circumferential edge of the intake passage, At least a portion of an existence region of one of the plurality of struts in the circumferential direction overlaps with an existence region of the partition plate in the circumferential direction, None of the plurality of struts are connected to the partition plate and are separate from the partition plate. Intake casing.

3. In the intake casing according to claim 1 or 2, an outer circumferential edge of the introduction annular passage is located radially outward of an outer circumferential edge of the intake passage at a connection position of the bell mouth with the intake chamber casing, The partition plate extends radially inward from the outer circumferential edge of the introduction annular passage to a position within a position of the outer circumferential edge of the intake passage at the connection position. Intake casing.

4. In the intake casing according to claim 1 or 2, The rigidity of the partition plate is lower than the rigidity of each of the plurality of struts. Intake casing.

5. An intake casing according to claim 1 or 2; The compressor rotor; The compressor casing; having Axial flow compressor.

6. The axial flow compressor according to claim 5 ; a combustor capable of burning fuel in the air compressed by the axial flow compressor to generate combustion gas; a turbine that can be driven by the combustion gas; A gas turbine comprising:

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