超声速气流中凹腔对液体射流穿透深度的影响

采用高速摄影对凹腔上游液体垂直射入超声速气流中的穿透深度展开了试验研究。进行了不同喷注位置和液气动量通量比条件下,平板射流和带凹腔射流的试验,研究了凹腔对射流穿透深度的影响。试验发现,射流穿透深度在凹腔前缘降低,射流边界曲线向凹腔内弯曲；射流穿透深度在凹腔后缘增大。凹腔对射流液雾的卷吸作用使穿透深度降低,剪切层撞击凹腔后缘形成的高压波传递使得穿透深度在后缘增大。减小液气动量通量比是增大凹腔对射流卷吸作用的途径之一。喷注在凹腔上游3倍凹腔深度的距离上,凹腔对穿透深度降低最大。 

Effect of cavity on liquid jet penetration in supersonic crossflow

An experimental investigation on the penetration of cavity upstream liquid jet was conducted with high speed camera. Experiments of plate jet and cavity jet were performed on the different conditions of jet positions and momentum flux ratios to investigate the influence of the cavity on the jet penetration. Results indicated that the jet penetration decreased at the inlet of the cavity and the jet boundary bent to the cavity because of the entrainment of the cavity. Jet penetration increased at the outlet of the cavity due to the shear layer impinging the cavity outlet edge, forming a high pressure field. The decrease of momentum flux ratio led to a strong cavity enterainment. The penetration decreased to the lowest at the cavity front edge when the jet position was 3D(where D is the cavity depth).