基于渗透边界的Bump型面反设计方法

Bump Surface Design Based On Permeable Boundary Inverse Method

为克服乘波体方法设计Bump型面灵活性不足的问题,发展出一套可适用于三维非结构网格的渗透边界反问题设计方法。融合渗透边界和运动边界的处理方法,应用扩展的流线追踪技术将渗透边界的反问题设计技术扩展到三维非结构网格。在激波面上将渗透速度与激波切向速度组合成"虚拟渗透速度",通过追踪该速度获得修正后的激波面形状。在24325的网格量下得到最终的Bump型面及其激波形状只需3min左右,与正圆锥流场截取的Bump型面相比误差为1.5%左右。通过数值计算表明渗透边界的反问题方法设计的Bump型面可以有效地排除前体低能流。从而为Bump型面的设计提供了一个新的方法。

To overcome the problem of insufficient flexibility in waverider method on Bump surface design,This paper develops a permeable boundary inverse method which can be used on threedimensional unstructured grid.The method composited the treatment of permeable boundary and moving boundary methods,and utilized extension streamline tracing technique which could expand the application field to three-dimensional unstructured grids.The shape of shock wave surface was calculated out by tracing 'virtual penetrating velocity' which was combined by permeable velocity and tangential velocity on shock surface.The calculation for ultimate bump surface and shock wave shape on girds with 24325 elements just needed 3 minutes,and the relative error just about 1.5% comparing with accurate cone flowfield.The numerical simulation showed that the Bump surface which design by permeable inverse design method could efficiently remove the forebody low-kinetic energy flow.Thus it can provide a new method for bump surface design.