不可压缩剪切层入口影响的实验研究

The Influence of Incompressible Shear Layer Inflow Conditions on Mixing Layer Development

为了研究不可压缩剪切层入口对混合层空间发展的影响,通过实验手段,对流场不同站位的流向速度进行测量。对比不同状态以及不同入口速度型条件下各个站位的速度型,结果显示:入口速度型对剪切层空间发展状况起决定作用,相似的入口速度型,在剪切层充分混合之前,各个站位的速度型是相似的。入口速度型会影响混合层的充分发展状态,速度比或速度差会影响混合层中速度最小值,同时影响剪切层充分混合开始的位置。

Mean velocity profiles with different stations of incompressible shear-layer flow experiments are used to analyze the effects of different inflow velocity profiles on the shear layer development. Mean velocity profiles with different stations vary from flow states and inflow velocity profiles, the results show that： inflow conditions dominate the development of shear layer. When shear layer have similar inflow velocity profiles, velocity profiles at the same station are similar before it fully developed. Inflow velocity profiles also influence the mixing layer development, ve- locity ratio or velocity differences between two streams change the minimum velocity of mixing layer and the flow di- rection position of full-developed region of shear layer.