Double-layer wall cooling structure with transverse corrugated impact pore plate for vectoring exhaust nozzle

Abstract

The invention discloses a double-layer wall cooling structure composed of a transverse corrugated impact plate and a flat plate type gas film plate. According to the double-layer wall cooling structure, impact holes and gas film holes are distributed in a crossed mode, the impact holes are formed in wave troughs of the corrugated impact pore plate, the gas film holes in the gas film pore plate arearranged at wave peaks just opposite to the corrugated impact pore plate, and the corrugated impact pore plate and the gas film pore plate are in a plurality of unit cycle structures in the axial direction. Small impact distances are formed between the wave troughs and the gas film pore plate so that impact heat exchange can be enhanced, larger spaces can be formed between the wave peaks and thegas film pore plate, so that the cold gas flow can be fully developed, flowing out of the cold gas can be facilitated, the flow resistance can be reduced, the cold gas utilization rate can be improved, and the contradiction that the impact distances are reduced so as to enhance the heat exchange, but the impact distances need to be increased so as to reduce the flow resistance is solved. Meanwhile, the gas film plate is a flat plate, so that the adhesion of a gas film is facilitated, then effective heat protection is formed, the thermal stress is reduced, and the problem of non-uniform thermalstress of a corrugated heat insulation screen is solved.

Description

technical field [0001] The invention belongs to the field of cooling of aero-engine vectoring nozzles, and is also used for cooling of engine combustion chambers and afterburner heat shields, in particular to a double-layered transverse corrugated impact orifice plate for vectoring nozzles wall cooling structure. Background technique [0002] The vector nozzle plays an important role in improving the maneuverability of the aircraft. The temperature of the gas in the nozzle can reach above 2000K. Let it cool. Since the cooling air of the nozzle is extracted from the compressor of the engine, this part of the cold air will not be able to participate in the entire thermal cycle of the engine, which will reduce the thermal efficiency and thrust of the engine. Therefore, when designing a high-performance nozzle, it is necessary to achieve as much as possible It is possible to achieve a higher cooling effect with less cold air. [0003] The double-walled cooling structure is an...

AI Technical Summary

Problems solved by technology

This structure can solve the contradiction between reducing the impact distance in order to enhance heat transfer, but increasing the impact distance in order to reduce flow resistance, and at the same time solve the problem of uneven thermal stress of the corrugated heat shield

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