Double Wall Big Elbow

Abstract

The invention discloses a double-walled large elbow. The double-walled large elbow comprises an inner wall component and an outer wall component which are arranged inside and outside in sequence. The inlet ends of the inner wall assembly and the outer wall assembly are connected to form a supporting structure, which is used to support the diffuser in the axial direction, and then the inlet end of the double-walled large elbow is axially limited by the diffuser. , and at the same time make the inlet end of the double-walled large elbow have free thermal expansion along the radial direction. The supporting structure is also used to support the outlet of the flame tube, so that the outlet of the flame tube is sealed and connected with the double-walled large elbow, and at the same time, the outlet of the flame tube has free thermal expansion along the axial direction. The outlet ends of the outer wall assembly and the inner wall assembly are connected to form an open overlapping structure, so that the inner wall assembly has free thermal expansion in the axial and radial directions, and the extension portion of the outlet end of the outer wall assembly forms a fixed structure. The fixing structure is also used to support the guide so that the guide has free thermal expansion in the axial direction.

Description

technical field [0001] The invention relates to the technical field of aero-engine return combustion chambers, in particular, to a double-walled large elbow. Background technique [0002] Small and medium gas turbine engines rotate at very high speeds. In order to avoid rotor dynamics problems, the compressor and turbine must be compactly arranged to shorten the wheelbase. In order to organize efficient combustion in a limited space, annular return combustion chambers are used in small and medium gas turbine engines. is widely used. Compared with the direct-flow combustion chamber, there are more exhaust elbows at the outlet of the flame tube of the reflux combustion chamber. The inner and outer profiles of the exhaust elbows are respectively large elbows and small elbows. Therefore, it can be said that the large elbow is the return flow. Unique structure on the combustion chamber. The high-temperature and high-pressure gas flows from the outlet of the flame tube into the ...

AI Technical Summary

Problems solved by technology

[0010] The invention provides a double-wall large elbow to solve the problem that the existing double-wall large elbow is often caused by poor design of the connection structure of the two-layer wall, so that the internal stress of the part cannot be released, resulting in local cracks, and then Technical issues affecting engine life and safety

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