Front output shaft engine helicopter air inlet channel configuration design method

Abstract

The invention discloses a front output shaft engine helicopter air inlet channel configuration design method. The method comprises the steps of determining basic design elements, constructing a trumpet-shaped virtual appearance curved surface wrapping a power output shaft, constructing a main air inlet channel virtual curved surface, cutting the virtual appearance curved surface, and materializing the remaining cut part to form an air inlet channel inner curved surface, cutting the virtual curved surface of the main air inlet channel, and materializing the remaining cut part to form an outer curved surface of the air inlet channel, establishing a curved surface between the air inlet channel inner curved surface and the air inlet channel outer curved surface, and enabling the curved surface to be tangentially continuous with the connection part of the air inlet channel inner curved surface and the air inlet channel outer curved surface, and guiding in the shape of the fairing, conducting chamfering on the shape of the fairing and the air inlet channel outer curved surface, and forming the final air inlet channel configuration. The design method provided by the invention is simple and fast, is successfully applied to a certain large transport helicopter, and has a great engineering application value.

Description

technical field [0001] The invention relates to the field of overall design of helicopters, in particular to a design method for the configuration design of a helicopter inlet of a front output shaft engine. Background technique [0002] The air intake of the helicopter connects the air intake of the engine with the external atmosphere of the power cabin to supply the air required by the engine. The air intake directly affects the working efficiency of the engine. It is an important part for the normal operation of the engine and plays an important role in the performance of the helicopter. [0003] The front output shaft engine needs to extend a power shaft from the engine air inlet to enter the final drive, and transmit the engine power to the final drive. The engine inlet needs to wrap the power shaft and at the same time provide the engine air intake smoothly. A reasonable inlet shape design is a key factor to meet the engine intake flow and flow field requirements and e...

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Problems solved by technology

[0004] At present, there is no such inlet configuration design method in China. It is mainly realized by means of surveying and mapping, which cannot meet the design requirements of new products.

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