Experimental studies on open cavity flows at supersonic speed of M = 2.0 were carried out. Oil flow visualization tests were made to understand the steady features of the surface flow field. Unsteady pressure measurements were done at five locations inside the cavity and pressure spectrum of these measurements were obtained. Cavity floor was made inclined to influence the flow directing towards the cavity leading edge with both, a favourable and adverse slope, by giving a positive and negative inclination angles to the floor, respectively. It is observed that the negative inclinations to the cavity floor behaves in a similar way to the base cavity, but a positive inclination helps to reduce the fluctuating pressures by 80% and reduce OASPL to the order of 14 dB and more.

进行了超声速为M = 2.0时开腔流动的实验研究。进行油流可视化测试以了解表面流场的稳定特征。在型腔内部的五个位置进行了非稳态压力测量，并获得了这些测量的压力谱。使空腔地板倾斜，以分别通过给地板正负的倾斜角度来影响流向空腔前缘的流量，有利和不利的斜率。可以看到，腔底的负倾角与基础腔的倾角相似，但是正倾角有助于将波动压力降低80％，并将OASPL降低到14 dB甚至更高。