六类高超声速激波-激波干扰的数值模拟研究

Numerical investigation for six types of hypersonic turbulent shock-shock interaction

基于粘性全N S方程,利用有限体积法进行数值离散,对Ⅰ到Ⅵ六种类型的激波-激波干扰现象进行了数值模拟,其中采用了二阶Harten TVD格式,LU隐式算法以及Baldwin Lomax代数湍流模型。每种类型都得到了清晰的干扰流场结构,其中Ⅳ型干扰的模拟结果与实验结果进行了比较,符合较好。数值模拟结果的对比指出,由入射位置差异引起的不同类型激波-激波干扰结构有很大不同,对壁面压强分布的影响也存在较大差异。

Hypersonic turbulent shock-shock interaction of six types (from I to VI), with different impinging shock conditions, is simulated numerically by solving full N-S equations. Finite volume method, second-order Harten-TVD scheme, lower-upper numerical method and algebraic Baldwin- Lomax model are used. Fluid structure of every type could be seen clearly from the flow field. The simulation result of type IV is compared with experimental data, and makes a good agreement. And from the result, it is observed that fluid structure and wall pressure distribution have obvious differences of different types of interaction.