A Study of Under-expanded Moist Air Jet Impinging on a Flat Plate

当气体通过在的一张会聚的嘴膨胀时比率对停滞压力周围比批评的，从嘴的发出的喷气是下面膨胀的的高。如果一个扁平的盘子是到在从嘴的某个距离的喷气的放的正常，一个分开的冲击波在在嘴出口和板之间的一个区域被形成。一般来说，有非平衡冷凝作用的超声的潮湿的空气喷气技术很经常被用于工业生产过程。尽管有在侵犯到稳固的身体的超声的潮湿的空气喷气的主要特征的重要性，它的质的特征不令人满意地被知道。在现在的学习，在一个垂直扁平的盘子上侵犯的下面膨胀的空气喷气上的非平衡冷凝作用的效果与非平衡冷凝作用在情况中数字地被调查，没有非平衡冷凝作用，为流动领域的摆动的频率变得比那大，并且静态的压力的振幅干燥空气与那些相比变得小。而且，数字结果与试验性的相比。关键词可压缩的流动 - 非平衡冷凝作用 - 侵犯喷气 - 模拟 CLC 数字

When a gas expands through a convergent nozzle in which the ratio of the ambient to the stagnation pressures is higher than that of the critical one, the issuing jet from the nozzle is under-expanded. If a flat plate is placed normal to the jet at a certain distance from the nozzle, a detached shock wave is formed at a region between the nozzle exit and the plate. In general, supersonic moist air jet technologies with non-equilibrium condensation are very often applied to industrial manufacturing processes. In spite of the importance in major characteristics of the supersonic moist air jets impinging to a solid body, its qualitative characteristics are not known satisfactorily. In the present study, the effect of the non-equilibrium condensation on the under-expanded air jet impinging on a vertical flat plate is investigated numerically in the case with non-equilibrium condensation, frequency of oscillation for the flow field becomes larger than that without the non-equilibrium condensation, and amplitudes of static pressure become small compared with those of dry air. Furthermore, the numerical results are compared with experimental ones.