Double Wall Cooling Structure with Longitudinal Corrugated Impact Orifice Plates for Vector Nozzles

Abstract

The present invention uses a longitudinal corrugated impingement plate and a flat air film plate to form a double-wall cooling structure. Both the impact holes and the air film holes are distributed in fork rows; the impact holes are arranged at the troughs of the corrugated impact orifice plate, and the air film holes on the air film orifice plate are arranged at the crests of the corrugated impact orifice plate; the corrugated impact orifice plate Both the air film orifice plate and the air film have a multi-unit periodic structure in the axial direction. A small impact distance is formed between the wave trough and the air film orifice plate, which can enhance the impact heat transfer, and a large space can be formed between the wave crest and the air film orifice plate, which is conducive to the full development of the cold air flow and the outflow, which can reduce the flow It improves the utilization rate of cold air, and solves the contradiction between reducing the impact distance in order to enhance heat transfer, but increasing the impact distance in order to reduce flow resistance. At the same time, the air film panel is a flat plate, which is conducive to the attachment of the air film, forming effective thermal protection, reducing thermal stress, and solving the problem of uneven thermal stress of the corrugated heat shield.

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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