Composite cooling structure for wall of combustion chamber flame tube of aero-engine

Abstract

The invention discloses a composite cooling structure for the wall of a combustion chamber flame tube of an aero-engine. The composite cooling structure is composed of a bottom plate wall (2) and a cover plate wall (3). The interior of the bottom plate wall (2) is cut into six parallel-connection micro-scale channel grooves (6) in the flowing direction of the flame tube, and six small air outlet through holes (5) are formed in the center line of each cut micro-scale channel groove (6). Large air inlet through holes (4) are formed in the position, corresponding to each cut micro-scale channel groove (6), of the cover plate wall (3). The bottom plate wall (2) and the cover plate wall (3) are welded into a whole, after welding is finished, bending treatment is carried out in the circumferential direction of the flame tube, and the side wall of the bottom plate wall (2) is coated with a heat barrier coating (7). According to the cooling structure, micro-scale channel cooling and diffusion hole air film cooling are combined, the micro-scale structure is fully utilized for enhancing heat transfer, and the cooling capacity of cooling air flow is achieved. The structural design and machining are simple, and the cooling structure can be achieved easily in actual machine types.

Description

technical field [0001] The invention belongs to the technical field of engineering heat and mass transfer, and in particular relates to a tile-like structure applied to composite cooling of the wall surface of a flame tube of an aeroengine combustion chamber. Background technique [0002] The combustor flame tube is the area where the aero-engine organizes combustion, and the temperature of the gas in this area is the highest. The cooling technology of the flame tube is directly related to the life and reliability of the combustion chamber, and affects the thermal efficiency of the entire engine. There are a lot of design research at home and abroad. [0003] The early combustion chamber flame tube cooling structure generally adopts a single-layer wall structure, and the overall cooling efficiency of such a structure is not high. The more advanced combustor flame tubes in the prior art mostly adopt a double-wall cooling structure, and the overall layout of the combustor fl...

AI Technical Summary

Problems solved by technology

However, the effective heat exchange area of ​​impingement cooling does not increase much, and the cooling airflow cannot be effectively heated up, and the utilization level of cooling capacity is not high.

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