充液腔体中气体射流冲击压力的实验测量

PRESSURE MEASUREMENTS OF GAS IMPINGING JETS IN A CYLINDRICAL CAVITY FILLED WITH WATER

对充液腔体中气体射流的冲击效应进行了实验研究.测量结果表明了冲击压力的瞬态最大值、稳态平均值和脉动值随喷管进口压比的增加而增加,冲击区是主要的噪声源和动态压力承载部位.通过充气与充水两种状态的对比实验,还揭示了腔体充水时气体射流冲击压力出现一个上冲阶段,其瞬态最大值比充气值有显著的增加.

This paper describes the experimental study on gas impinging jets in a cylindrical cavity filled with water. Measurements of the maximum instantaneous pressure in the initiative phase as well as the averaging and fluctuating pressures in the steady phase indicate that, at the stagnation point of the impinging region,these three pressures increase with increasing the nozzle inlet pressure ratio. The obtained results show that the impinging region, bearing the most intensive dynamic load, is the main noise source. Through a comparative approach, it is found that there is a pressure overshoot phenomenon in the water-filling case and its maximum instantaneous pressure is much higher than that in the corresponding gas-filling case.