过渡式空腔流动数值计算

摘要

采用雷诺平均N-S方程数值模拟了长深比L/D=12的空腔流动，分别计算了0.85Ma和1.5Ma两种速度下的流场，得到了空腔内压力、速度、涡量等分布图，分析了空腔内部流动特性。从计算结果可以看出，空腔流动明显表现出过渡式空腔流动特性，空腔前缘和后缘都有明显的涡流区域，而且当来流速度不同时，空腔内部流动分别表现出了闭式-过渡式和开式-过渡式的空腔流动特性。%Unsteady reynolds average N-S was adopted to simulate the lfow ifeld of aL/D=12(length to depth ratio, L/D),calculated the lfow ifeld of cavity at 0.85Ma and 1.5Ma. The characteristics of cavity lfow were analyzed by the results of pressure, velocity and vorticity distributions. The results indicate that there is a transformation that the cavity lfow type changes from close-transitional to open-transitional lfow when mach number changes.