The Effect of Non-Equilibrium Condensation on Supersonic Air Flows over Rectangular Cavities

数字模拟在开的、矩形的洞上为超声的二维的流动被执行了(length-to-depth 比率是 L/D = 1.0 和 3.0 ) 数以便为流动马赫在洞附近在超声的内部流动上调查潮湿的空气的非平衡冷凝作用的效果 1.83 在洞入口。在现在的计算调查，压缩流动被潮湿的空气的扩大在一张 Laval 嘴生产。计算结果证明没有冷凝作用，在上游的旅行压缩波浪变得比那些弱。因而，更弱的压缩波浪不能强烈使 shear 层激动，没有冷凝作用，在洞的摆动的振幅变得比那些小。在 L/D = 的情况下的非平衡冷凝作用的出现 1.0 强烈与 L/D = 相比在洞影响了摆动的振幅和频率 3.0。

Numerical simulations have been carded out for a supersonic two-dimensional flow over open, rectangular cavities （length-to-depth ratios are L/D = 1.0 and 3.0） in order to investigate the effect of non-equilibrium condensation of moist air on supersonic internal flows around the cavity for the flow Mach number 1.83 at the cavity entrance. In the present computational investigation, a condensing flow was produced by an expansion of moist air in a Laval nozzle. The computational results showed that the upstream traveling compression waves become weaker than those without the condensation. Consequently, the weaker compression waves cannot excite the shear layer strongly and amplitudes of oscillation in the cavity became smaller than those without the condensation. The occurrence of the non-equilibrium condensation in case of L/D = 1.0 affected strongly the amplitude and frequency of oscillation in the cavity compared with L/D = 3.0.