Double-wall cooling structure having longitudinal corrugated impact hole plate for thrust-vectoring nozzle

Abstract

In the invention, a longitudinal corrugated impact pore plate and a flat plate type air film plate are used to constitute a double-wall cooling structure. Impact holes and air film holes are distributed in a staggered manner respectively; impact holes are formed in wave troughs of the corrugated impact hole plate and air film holes in the air film hole plate directly face wave peaks of the corrugated impact hole plate; and each of the corrugated impact pore plate and the air film hole plate is a plurality of unit period structures in the axial direction. A relatively small impact distance is formed between the wave trough and the air film hole plate, so that the heat exchange by impact may be increased; a relatively larger space may be formed between the wave peak and the air film hole plate, full development of cool air flowing is facilitated, outflowing is facilitated, the flow resistance may be reduced, the utilization ratio of cold air is increased and the contradiction between themethod of impact distance reduction for heat exchange enhancement and the method of impact distance increase for flow resistance reduction is solved; and meanwhile, the air film plate is a flat plate, so that air film attachment is facilitated to form effective heat protection, heat stress is reduced and the problem of uneven heat stress of a corrugated heat shield 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 heat shields of afterburner chambers, in particular to a double-layered longitudinal corrugated impact orifice 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 structu...

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Problems solved by technology

[0004] The technical problem solved by the present invention is: the present invention proposes a novel double-walled cooling structure with longitudinal corrugated impact orifice for the nozzle, which can solve the problem of reducing the impact distance in order to enhance heat transfer, but in order to reduce the flow resistance The contradiction between the two methods needs to be increased to increase the impact distance, and at the same time solve the problem of uneven thermal stress of the corrugated heat shield

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