Combustion chamber flame tube adopting floating segments

Abstract

The invention provides a combustion chamber flame tube adopting floating segments. When cooling gas enters the flame tube from impact holes in the outer wall of the flame tube, the cooling gas impactsand cools the floating segments, then cooling gas flow enters the inside of the floating segments through impact holes in the floating segments, the wall surfaces of cooling gas flow channels in thefloating segments are subjected to impact cooling, and then the cooling gas flow flows to each part of the floating segments via the cooling gas flow channels, convection heat exchange cooling is carried out in the process, the cooling gas flow enters the flame tube through air film holes of the cooling gas flow channel in the process, a layer of gas film is formed on the inner wall surface of each floating segment to serve as gas film cooling, the cooling gas flow can be further reduced on the basis of existing floating segments through the combination of multiple cooling modes, and the cooling efficiency of a cooling structure of the flame tube can be improved.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to a high-efficiency cooling method for a combustion chamber flame tube using floating tiles. Background technique [0002] The gas temperature in the main combustion zone of the combustion chamber can be as high as 2400K, which is the highest temperature zone of the gas turbine. At present, the normal working temperature of the metal material of the flame tube wall does not exceed 1300K, and the material cannot withstand working for a long time in a harsh environment far exceeding its normal working temperature. , so the combustion chamber flame tube must be cooled to prevent the flame tube from being burned out and reduce the life of the combustion chamber, thereby reducing the life of the engine. In order to ensure that the combustion chamber has a long enough service life and reliability, two solutions are usually adopted: one is to increase the allowable working t...

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Problems solved by technology

With the continuous improvement of the performance of aero-engines, the flame cylinder cooling technology is also facing two difficulties: one difficulty is that with the improvement of aero-engine performance, the amount of air required to directly participate in combustion gradually increases; The ratio is also gradually increasing, and the temperature of the air at the outlet of the compressor, that is, the temperature of the air used to cool the wall of the flame tube is also gradually increasing, so the cooling capacity of the air at the inlet of the combustion chamber as a coolant is gradually decreasing

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