脉冲射流作用下驻点压力特性的试验研究

EXPERIMENTAL STUDY ON STAGNATION PRESSURE OF PULSE JET

利用自行研制的自激振荡脉冲射流发生装置对脉冲射流垂直冲击靶盘产生的驻点压力进行了试验研究,实测了不同参数下驻点压力的瞬时变化,分析了驻点压力的脉冲特性和沿程变化特性,探讨了喷嘴直径d、喷嘴出口速度V和靶距H对驻点压力的影响,并与相同工况下连续射流的打击力做了比较。试验结果表明,脉冲射流峰值打击力明显高于连续射流,驻点压力峰值持续时间随d增大而增长,同一喷嘴直径下,驻点压力峰值与V成正比,与H成反比。

The pulse characteristic and distributions of stagnation pressure produced by pulse jet impinging plate was investigated, and the instantaneous change of stagnation pressure were experimentally determined under different conditions. The effect of nozzle diameter d, nozzle export-speed V and nozzle-to-plate space H on stagnation pressure was analyzed. Through the comparison of pulse jet and continuous jet, the following conclusions were drawn. The stagnation pressure of pulse jet was much greater than that of continuous jet. The duration of peak value pressure increased with d. The peak value of stagnation pressure had direct ratio with V and reverse ratio with H.