CN106907738B

CN106907738B - Combustion chamber

Info

Publication number: CN106907738B
Application number: CN201710084587.2A
Authority: CN
Inventors: 曹阳; 柴昕; 赵传亮; 边际; 田中礼
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2017-02-16
Filing date: 2017-02-16
Publication date: 2019-12-20
Anticipated expiration: 2037-02-16
Also published as: CN106907738A

Abstract

The invention provides a combustion chamber, which comprises an outer combustion chamber casing (1), an inner combustion chamber casing (2), a final-stage stator (3) of a gas compressor and a diffuser (4), wherein the final-stage stator (3) of the gas compressor is provided with the diffuser (4), and the outer combustion chamber casing (1) is connected with the inner combustion chamber casing (2) through the final-stage stator (3) of the gas compressor, so that the force borne by the inner combustion chamber casing (2) is transmitted to the outer combustion chamber casing (1) through the final-stage stator (3) of the gas compressor. According to the combustion chamber, the diffuser (4) is not stressed any more, the diffuser (4) occupies a larger total volume of the combustion chamber, high-temperature alloy materials with high density are not needed, and only high-temperature resistant composite materials or light metal materials with low density are needed, so that the total weight of the combustion chamber is reduced.

Description

Combustion chamber

Technical Field

The invention belongs to the field of design of aero-engines, and particularly relates to a combustion chamber.

Background

One of the difficulties in the design of advanced gas turbine engines is reducing the weight of the engine and increasing its thrust-to-weight ratio. As shown in fig. 1, many combustors use a multi-channel diffuser configuration to meet combustor performance requirements. The multi-channel diffuser operates at temperatures above 500 degrees and also experiences significant torque and bending moments from the inner casing, necessitating the use of high temperature alloy steel materials with relatively high densities (about 8g/cm 3). Compared with a multi-channel diffuser, the final-stage stator of the gas compressor is smaller in total volume, and in order to ensure reliability under a high-temperature condition, a high-temperature alloy material is also adopted, so that the total weight of a combustion chamber is larger finally.

Disclosure of Invention

The invention aims to provide a combustion chamber, so as to reduce the weight of the combustion chamber.

The purpose of the invention is realized by the following technical scheme: a combustion chamber comprises a combustion chamber outer casing, a combustion chamber inner casing, a gas compressor final-stage stator and a diffuser, wherein the combustion chamber outer casing is connected with the combustion chamber inner casing through the gas compressor final-stage stator so that force borne by the combustion chamber inner casing is transmitted to the combustion chamber outer casing through the gas compressor final-stage stator, and the diffuser is arranged on the gas compressor final-stage stator.

Preferably, the compressor last stage stator is composed of tens of small blades.

Preferably, the diffuser is a three-channel diffuser.

Preferably, the combustion chamber outer casing, the combustion chamber inner casing and the compressor final stage stator are fixed together by welding, and the diffuser is fixed on the combustion chamber inner casing by bolts.

Preferably, the diffuser is made of high-temperature-resistant composite materials or light metal materials.

The combustion chamber provided by the invention has the beneficial effects that the axial force and the torsion bending moment on the casing in the combustion chamber are both transmitted to the outer casing by the last-stage stator of the compressor with smaller total volume, and the multichannel diffuser with larger total volume is not stressed any more, occupies the multichannel diffuser with larger total volume in the combustion chamber, does not need to use high-temperature alloy materials with large density, and only needs to use high-temperature resistant composite materials or light metal materials with lighter density, so that the total weight of the combustion chamber is reduced.

Drawings

FIG. 1 is a schematic structural view of a conventional combustor;

fig. 2 is a schematic view of the structure of the combustion chamber of the present invention.

Reference numerals:

1-combustion chamber outer casing, 2-combustion chamber inner casing, 3-compressor final stator and 4-diffuser.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The combustion chamber of the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 2, a combustion chamber comprises a combustion chamber outer casing 1, a combustion chamber inner casing 2, a compressor last-stage stator 3 and a diffuser 4, wherein the combustion chamber outer casing 1 is connected with the combustion chamber inner casing 2 through the compressor last-stage stator 3, the compressor last-stage stator 3 is composed of dozens of small blades to ensure that the strength requirement is met, the diffuser 4 is arranged on the compressor last-stage stator 3, and the diffuser 4 is preferably a three-channel diffuser 4. The connection relationship among the parts is described in detail with reference to fig. 2, the upper end of the last-stage stator 3 of the compressor is connected with the combustion chamber casing 1, the lower end of the last-stage stator 3 of the compressor is connected with the combustion chamber casing 2, the combustion chamber casing 1, the combustion chamber casing 2 and the last-stage stator 3 of the compressor are fixed together in a welding mode, a diffuser 4 is arranged on the right side of the last-stage stator 3 of the compressor, the diffuser 4 is in lap joint with the combustion chamber casing 1, meanwhile, the diffuser 4 is fixed on the combustion chamber casing 2 through bolts, and the bolts are also fixedly connected with the last-stage stator 3 of the compressor, namely, the diffuser 4, the last-stage stator 3 of the compressor and the casing 2 in the combustion chamber are fixed together through the bolts.

The force borne by the casing 2 in the combustion chamber is transmitted to the casing 1 outside the combustion chamber through the last-stage stator 3 of the gas compressor, and the diffuser 4 is only connected with the casing in the combustion chamber or the outer casing independently, so that the diffuser 4 does not bear mechanical force (the stress transmission route is shown in the position A in figure 2), the multi-channel diffuser 4 occupying a large total volume of the combustion chamber is formed, high-temperature alloy materials with high density (about 8g/cm3) are not needed, only high-temperature-resistant composite materials with low density or light metal materials with low density are needed (the density is only 1/3-1/5 of steel, and light titanium alloy materials can be preferentially adopted), and the total weight of the combustion chamber is reduced.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A combustion chamber comprises an outer combustion chamber casing (1), an inner combustion chamber casing (2), a final-stage stator (3) of a gas compressor and a diffuser (4), and is characterized in that the upper end of the final-stage stator (3) of the gas compressor is connected with the outer combustion chamber casing (1), the lower end of the final-stage stator (3) of the gas compressor is connected with the inner combustion chamber casing (2), the outer combustion chamber casing (1), the inner combustion chamber casing (2) and the final-stage stator (3) of the gas compressor are fixed together, so that force borne by the inner combustion chamber casing (2) is transmitted to the outer combustion chamber casing (1) through the final-stage stator (3) of the gas compressor, the last-stage stator (3) of the gas compressor is provided with the diffuser (4), the diffuser (4) is in lap joint with the outer combustion chamber casing (1), and the diffuser (4) is made of light titanium alloy materials.

2. The combustion chamber according to claim 1, characterised in that the compressor last stage stator (3) consists of tens of small blades.

3. The combustion chamber according to claim 1, wherein the diffuser (4) is a three-channel diffuser.

4. The combustion chamber as claimed in claim 1, characterised in that the combustion chamber outer casing (1), the combustion chamber inner casing (2) and the compressor last stage stator (3) are fixed together by welding, while the diffuser (4) is bolted to the combustion chamber inner casing (2).