JP-2026075512-A - Intake casing, axial compressor equipped with this intake casing, gas turbine equipped with this axial compressor

JP2026075512AJP 2026075512 AJP2026075512 AJP 2026075512AJP-2026075512-A

Abstract

[Challenge] Reduce intake resistance. [Solution] The intake casing comprises an intake chamber casing having an annular introduction passage and an introduction passage from the outer circumferential side of the introduction passage into the introduction passage; a bell mouth having an annular intake passage into which air can be introduced from the introduction passage into the compressor casing; a partition plate disposed within the introduction passage; and a plurality of struts arranged in the intake passage in a circumferential direction with respect to the axis. The partition plate extends radially inward from the outer circumferential edge of the introduction passage, dividing the introduction passage into one side and the other in the circumferential direction. The plurality of struts extend radially outward from the inner circumferential edge of the intake passage to the outer circumferential edge 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. [Selection Diagram] Figure 3

Inventors

下条健悟
奥井英貴
森田大輔

Assignees

三菱重工業株式会社

Dates

Publication Date: 20260508
Application Date: 20241022

Claims (6)

In an intake casing capable of introducing air into a compressor casing that covers a compressor rotor rotatable around an axis, An intake chamber casing having an annular introduction channel around the aforementioned axis and an introduction channel that allows air to be introduced into the introduction channel from the outer circumference side of the introduction channel, A bell mouth is formed which an intake passage is annular around the aforementioned axis, and which allows air to be introduced into the compressor casing from the introduction annular passage. A partition plate is located within the aforementioned annular inlet channel, in a region opposite to the inlet channel with respect to the axis, A plurality of struts arranged in the circumferential direction with respect to the axis within the intake passage, Equipped with, The bell mouth is positioned on the downstream side of the axial direction in which the axis extends relative to the intake chamber casing, and is connected to the intake chamber casing so that the intake passage and the introduction annular passage can communicate with each other. The partition plate extends radially inward from the outer edge of the annular introduction channel with respect to the axis, and divides the inside of the introduction channel into one side and the other side in the circumferential direction. Each of the plurality of struts extends radially outward with respect to the axis from the inner periphery of the annular intake passage to the outer periphery of the intake passage, Of the plurality of struts, the circumferential position of one strut is within ±2.5° in the circumferential direction with respect to the circumferential position of the partition plate. Intake casing.
In an intake casing capable of introducing air into a compressor casing that covers a compressor rotor rotatable around an axis, An intake chamber casing having an annular introduction channel around the aforementioned axis and an introduction channel that allows air to be introduced into the introduction channel from the outer circumference side of the introduction channel, A bell mouth is formed which an intake passage is annular around the aforementioned axis, and which allows air to be introduced into the compressor casing from the introduction annular passage. A partition plate is located within the aforementioned annular inlet channel, in a region opposite to the inlet channel with respect to the axis, A plurality of struts arranged in the circumferential direction with respect to the axis within the intake passage, Equipped with, The bell mouth is positioned on the downstream side of the axial direction in which the axis extends relative to the intake chamber casing, and is connected to the intake chamber casing so that the intake passage and the introduction annular passage can communicate with each other. The partition plate extends radially inward from the outer edge of the annular introduction channel with respect to the axis, and divides the inside of the introduction channel into one side and the other side in the circumferential direction. Each of the plurality of struts extends radially outward with respect to the axis from the inner periphery of the annular intake passage to the outer periphery of the intake passage, Of the plurality of struts, at least a portion of the area of existence of one strut in the circumferential direction overlaps with the area of existence of the partition plate in the circumferential direction. Intake casing.
In the intake casing according to claim 1 or 2, the outer peripheral edge of the introduction annular passage is located radially outward from the outer peripheral edge of the intake passage at the connection position of the bell mouth with the intake chamber casing, The partition plate extends radially outward from the outer edge of the introduction annular passage to a position within the position of the outer edge of the intake passage at the connection point. Intake casing.
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.
An intake casing according to claim 1 or 2, The compressor rotor and, The compressor casing and, Having, Axial flow compressor.
The axial flow compressor according to claim 5, A combustor capable of generating combustion gas by burning fuel in air compressed by the aforementioned axial flow compressor, A turbine that can be driven by the aforementioned combustion gas, A gas turbine equipped with a gas turbine.

Description

This disclosure relates to an intake casing, an axial compressor comprising the intake casing, and a gas turbine comprising the axial compressor. A gas turbine comprises an axial compressor capable of compressing air to produce compressed air, a combustor capable of burning fuel in the compressed air to produce combustion gases, a turbine driven by the combustion gases, an intake casing, and an intermediate casing. An axial-flow compressor comprises a compressor rotor rotatable about an axis, a compressor casing enclosing the compressor rotor, and an intake casing that guides air into the compressor casing. The turbine is positioned downstream of the compressor. This turbine comprises a turbine rotor rotatable about an axis and a turbine casing enclosing the turbine rotor. The turbine rotor is connected to the compressor rotor. The intake casing is connected to the upstream end of the compressor casing to allow air to enter the compressor casing. The intermediate casing is positioned axially between the compressor casing and the turbine casing. The combustor is mounted in the intermediate casing to allow compressed air discharged from the axial compressor into the intermediate casing. The following Patent Document 1 describes an intake casing for an axial flow compressor. This intake casing comprises an intake chamber casing and a partition plate. The intake chamber casing has an annular intake channel formed around the axis, and an intake channel into which air can be introduced from the outer periphery of the intake channel. The partition plate is located within the intake channel, in a region opposite to the intake channel with respect to the axis. This partition plate extends radially inward from the outer edge of the annular intake channel relative to the axis, dividing the intake channel into one side and the other side in the circumferential direction. Japanese Patent Publication No. 2012-207619 This is a schematic cross-sectional view of a gas turbine in one embodiment relating to this disclosure.This is a cross-sectional view of an intake casing in one embodiment of the present disclosure.This is a cross-sectional view taken along line III-III in Figure 2.This is a cross-sectional view of the intake casing in the comparative example.This is a cross-sectional view taken along line V-V in Figure 4. The following describes embodiments of the intake casing, the axial compressor equipped with this intake casing, and the gas turbine equipped with this axial compressor, with reference to the drawings. "An embodiment of an axial flow compressor and a gas turbine equipped with the axial flow compressor" Hereinafter, an embodiment of the gas turbine in this embodiment will be described with reference to Figure 1. The gas turbine in this embodiment comprises an axial flow compressor (hereinafter simply referred to as "compressor") 30 capable of compressing air A to generate compressed air Acom, a plurality of combustors 10 that burn 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. The compressor 30 includes a compressor rotor 31 rotatable about its axis Ar, a compressor casing 32 covering the compressor rotor 31, a plurality of compressor stator blade rows 33, an intake volume regulator 34, and an intake casing 40. The turbine 20 includes a turbine rotor 21 rotatable about its axis Ar, a turbine casing 22 covering the turbine rotor 21, a plurality of turbine stator blade rows 23, and an exhaust casing 25. In the following, the direction in which the axis Ar extends is defined as the axial direction Da, one side of the axial direction Da is defined as the upstream side Dau, and the other side of the axial direction Da is defined as the downstream side Dad. The circumferential direction centered on the axis Ar is simply defined as the circumferential direction Dc. Furthermore, the direction perpendicular to the axis Ar is defined as the radial direction Dr, the side of the radial direction Dr approaching the axis Ar is defined as the radially inward Dri, and the opposite side is defined as the radially outward Dr. The compressor 30 is positioned upstream of the turbine 20 on the axis Da. The compressor rotor 31 has a compressor rotor shaft 31s extending in the axial direction Da with the axis Ar as the center, and a plurality of compressor rotor blade rows 31b attached to this 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. One of the plurality of compressor stator blade rows 33 is positioned downstream of each of the plurality of compressor rotor blade rows 31b on the axis Da. Each compressor stator blade row 33 is mounted inside the compressor casing 32. Each c