一种基于三维粘性流场的乘波体生成方法

A design method of waveriders derived from 3D viscous flow

为了便于乘波体的优化设计工作,本文实现了一种基于任意三维粘性流场,在激波面上截取乘波体前缘线来生成乘波体外型的设计方法,并与NASA Langley研究中心的CFL3D软件的算例结果进行了比较检验,误差满足工程计算要求。由于在流场计算中直接计入了粘性,而不像大多数的研究方法那样通过无粘计算再进行粘性修正,而且对于高超声速乘波体设计,可以在程序中考虑真实气体效应、化学反应等因素,因此本文的设计方法更接近工程实际,更具有推广价值。

In order to design and optimize waveriders, a design procedure by solving arbitrary three-dimensional flowfield with full viscous 3-D computation software （NAPA） is presented. Given the solved generating flowfield and a leadingedge curve, the lower surface of a waverider is constructed by tracing the streamtraces from the bow shock downstream to a desired location. The results of test cases are compared with that from CFL3D by NASA Langley Research Center and the validation is quite well. Unlike most other methods which generate waveriders from inviscid flow and then carry on modifications with consideration of viscous interaction, the method described in this paper deals with viscous flowfield directly. Furthermore, considering the high-temperature flow over hypersonic waveriders, real-gas effects, chemically reacting effects, etc, can be added to the software, so this design method is more practical.