An integrated casing for a combined engine

Abstract

The invention discloses an integrated casing for a combined engine, which belongs to the technical field of combined engine structure design. The outer shape of the casing is a hollow annular cavity structure. The two ends of the annular cavity structure are respectively provided with a gas collecting cavity. The gas collecting cavity communicates with the outside world through the through hole structure on the outer circumference of the annular cavity structure. The cavity is the helium outlet and the gas inlet respectively. The through hole structure corresponding to the helium outlet is the helium inlet, and the through hole structure corresponding to the gas inlet is the gas outlet. The gas inlet is connected to the external combustion chamber outlet casing, and the helium inlet It is connected to the high temperature heat exchanger pipeline. The invention can meet the requirements of compact structure and low flow resistance of the combined engine by coupling the helium gas inlet flow pipe with the gas casing.

Description

technical field [0001] The invention belongs to the technical field of combined engine structure design, and in particular relates to an engine casing structure using two working media. Background technique [0002] In the field of hypersonic air-breathing combined engines, the third medium fluid (usually helium) is used to cool high-temperature incoming air to reduce the airflow temperature before the air compressor. An important development direction. In such engine solutions, a helium turbine is usually used instead of a gas turbine to drive the air compressor. The traditional gas exhaust casing and the helium intake casing are loose in structure, and the size of the components is large, which will lead to an air compressor-helium turbine. The increase in the length of the shafting is not conducive to the reliable operation of the shafting, and at the same time, the axial dimension of the engine will be greatly increased, which cannot meet the requirements of the high-com...

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Problems solved by technology

[0002] In the field of hypersonic air-breathing combined engines, using the third medium fluid (usually helium) to cool the high-temperature incoming air to reduce the airflow temperature before the air compressor, and the scheme of widening the working speed range of the turbine engine is the current hypersonic engine. An important development direction, such engine schemes usually use a helium turbine instead of a gas turbine to drive the air compressor. The traditional gas exhaust casing and helium intake casing have a loose structure and large component sizes, which will lead to air compressor-helium turbine The increase in the length of the shaft system is not conducive to the reliable operation of the shaft system. At the same time, it will greatly increase the axial size of the engine, which cannot meet the design requirements of the high-compact engine structure

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