Design method of basic flow field of inward turning inlet with controllable flow field parameters of outlet section

Abstract

The invention provides a design method for an internal rotation air inlet basic flow field with controllable outlet section flow field parameters. The shape of the lower boundary of the basic flow field is designed according to one kind of flow field parameter distribution of an outlet section. The method comprises the following steps: firstly, designing an aero-dynamic profile capable of generating reflected shock waves according to wave-back flow field parameters at the vertex of the reflected shock waves; and then, designing an aero-dynamic profile capable of adjusting wave-back dependence domain outlet downstream flow field parameters of the reflected shock waves to be consistent with the outlet section flow field parameters according to one type of flow field parameter distribution of the outlet section. Through adoption of the design method, only one parameter at the outlet section needs to be restrained, and the flow field parameter distribution at the outlet section is hardly restrained, so that the given range of given flow field parameters is enlarged. When the flow field parameter at the vertex of the reflected shock waves is controlled, the reflection of the reflected shock waves in an air inlet isolator can be effectively controlled, and meanwhile the strength of mutual interference between the reflected shock waves and a boundary layer is weakened, so that the aerodynamic performance of the air inlet is improved.

Description

technical field [0001] The invention relates to the design field of an inwardly rotating inlet whose Mach number is greater than 3, in particular to a basic flow field design method of an inwardly rotating inlet with controllable outlet section flow field parameters. Background technique [0002] In the past ten years, the internal rotation inlet has been widely used in the design of high Mach number (3<M<5) and hypersonic (M>5) air-breathing propulsion systems. In the basic flow field of the traditional revolving inlet, the reflected shock wave is generated by the lower boundary of the horizontal basic flow field. In this case, the compression process of the inlet to the incoming flow mainly includes inlet shock wave, isentropic compression, There are four parts of reflected shock wave and isolation section. Due to design reasons, the upper surface of the basic flow field of the traditional inward-turning inlet can not absorb the reflected shock wave well, which m...

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Problems solved by technology

Secondly, on the premise of not considering the existence, although the method of completely determining the basic flow field according to the outlet parameters is relatively simple, this method also limits the compression law of the flow field at the same time. bring some difficulties

In addition, the compression law of the flow field also has a great influence on the development of the boundary layer, so it is difficult to control the viscous loss of the inlet by using this method, and it is difficult to control the mutual interference between the reflected shock wave and the boundary layer

It can be seen that how to adjust the compression law of the flow field according to the outlet parameter distribution is another major obstacle that limits the application of this method.

[0006] Based on the above two reasons, the method of designing the basic flow field according to the distribution of outlet parameters is currently limited to the binary inlet, and the application in the design of the inlet of the internal rotation meter needs to be further studied

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