结构参数对自激式脉冲射流装置性能的影响

Effect of Structural Parameters on the Self-oscillating Pulse Jet Device Performance

运用自行研制的脉冲射流试验装置,就自激式脉冲射流装置的上下喷嘴直径、腔长和腔径等结构参数对其性能的影响进行了试验,分析了上喷嘴直径一定时,其他结构参数对射流打击力的影响.研究表明,在一定工作压力下,不同下喷嘴直径下的射流打击力随腔长的变化和不同腔径下的射流打击力随下喷嘴直径的变化不同;在不同工作压力下,某一下喷嘴直径下的射流打击力随腔长的变化规律和某一腔径下的射流打击力随下喷嘴直径的变化规律基本相同;一定喷嘴直径下不同腔长的射流打击力随工作压力的增大基本呈线性上升,但不同喷嘴直径下的某一腔长的射流打击力随工作压力的变化有差异.最后,给出了自激式脉冲射流装置性能较优的结构参数的最佳范围.研究结果为进一步研究自激式脉冲射流装置性能提供了依据.

The pulse jet test device has been developed independently.It was used to test the effect of structural parameters,such as the upper and lower nozzle diameter,cavity length and lumen diameter,etc.on self-excited pulse jet device performance,and other structural parameters on jet strike force when upper nozzle diameter is constant.Studies have shown that under a certain working pressure conditions,the striking force under different lower nozzle diameter will change with the different cavity length,and that under different cavity diameter will change with the different nozzle diameter.Under the different working pressure condition,the laws of jet strike force with the different cavity length under certain nozzle diameter and with the different nozzle diameter under certain cavity length are similar.The jet strike force under certain nozzle diameter almost linearly rises with the increase of working pressure,while there are some differences under different nozzle diameters.Finally,the optimum ranges of structural parameters which have the better influence of the self-excited pulse jet device have been given.This can provide some evidences for further studying the performance of the self-excited pulse jet device.