A waverider design method and medium based on gas density variable search

Abstract

A waverider design method based on gas density variable search, adjust the shock wave flow field by designing the shock wave generator, and conduct a density gradient search along the normal direction at each station point in the space flow field to find the density The grid point with the maximum gradient compresses the spatial grid so that the outermost grid falls at the grid point with the largest density gradient; the outermost grid surface is smoothed using the Akima spline interpolation method; According to the aspect ratio constraints of the target aircraft, the mesh surface is cut to obtain the waverider front edge, and the waverider surface is obtained by streamline tracing method. Compared with the positive design method of the waverider, the present invention can change the shape of the shock wave by adjusting the shape of the shock wave generator, and can break through the limitation of the lift-to-drag ratio; in addition, the calculation of the space flow field adopts the shock wave capture method, compared with the shock wave The wave assembly method has the advantages of fast convergence and strong robustness.

Description

technical field [0001] The invention relates to a waverider design method and medium based on gas density variable search, and belongs to the field of aircraft aerodynamic layout design. Background technique [0002] Advanced aerodynamic layout is one of the core technologies in the development of hypersonic vehicles. The waverider is a typical hypersonic aerodynamic configuration, and its notable feature is that the shock wave is completely attached to the leading edge of the entire vehicle in the design state. The pressure on the windward side increases rapidly after the shock, resulting in a higher lift-to-drag ratio. The lift-to-drag ratio is a very important parameter that reflects the aerodynamic characteristics of a hypersonic vehicle. It is directly related to key combat technical indicators such as the flight range and lateral maneuverability that the aircraft can achieve. The waverider design is one of the key points and hotspots in the current research on the ae...

AI Technical Summary

Problems solved by technology

Positive design methods such as cone-guided waveriders are based on quasi-two-dimensional flow fields, and the flow field simulation is accurate, but the shape of the shock wave is relatively fixed, and there is a lift-to-drag ratio limit

Although the inverse design method can specify the shape of the shock wave and expand the design space, the flow field ignores the lateral flow, and the scope of application is small, so it is difficult to accurately guarantee the waveriding performance

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