A serpentine channel cross-flow air-to-air heat exchanger structure for aero-engine

Abstract

The invention provides a meandering channel cross flow air-air heat exchanger structure of an aeroplane engine. Extending triangular fins are arranged in a heat flow channel of a heat exchanger. The triangular fins arranged in the heat flow channel in a staggered mode. A folding line type heat flow outer channel is formed by the outer surfaces of the triangular fins. Cross flow heat transfer is adopted for the heat flow outer channel and a cold flow channel of the heat exchanger. The triangular fins have certain thicknesses and are hollow inside. A heat flow inner channel is formed by series connection of the hollow inner channels of the triangular fins. The heat flow inner channel is arranged in an N shape and conducts downstream and countercurrent heat exchange with fluid in the cold flow channel of the heat exchanger sequentially. The heat flow inner channel is separated from the heat flow outer channel by partitioning plates. The partitioning plates are arranged on two sides of theheat flow channel. An inlet of the heat flow inner channel is formed in one side of one of the partitioning plates. The lateral side of the other partitioning plate is a sealed surface. The heat exchanging effect is effectively improved, and weight of the heat exchanger is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of aero-engine heat exchangers, in particular to a meandering channel cross-flow air-to-air heat exchanger structure for aero-engines. Fluid direction, providing impact heat transfer effect on the primary heat transfer surface. Background technique [0002] The cold and hot flows of the aero-engine heat exchanger come from the low-temperature gas in the external duct and the bleed air of the high-pressure compressor respectively. The high-temperature and high-pressure hot gas passes through a flat channel to exchange heat with the cold air. The cold air channel is a rectangular channel, and the hot gas channel is connected to the The cold air passages intersect in a cross shape, and the hot air passages repeatedly shuttle through the cold air passages. Usually, parallel straight fins are arranged in the cold and hot air passages to enhance heat exchange, but this will increase the weight of the heat exchang...

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Problems solved by technology

Liu Yinze published a paper titled "Flow Heat Exchange Performance Analysis of Primary Surface Heat Exchangers of Aeroengines" on aero-engines, in which 4 different structural forms of primary surface heat exchangers were proposed, but the present invention involves using There are no papers or patents published on the structure of the meandering channel for impinging heat exchange on the primary heat exchange surface.

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