淹没条件下不同结构参数的自激吸气式脉冲射流喷嘴压力变化试验研究

运用自行研制的试验装置对淹没条件下的自激吸气式脉冲射流喷嘴特性进行了大量的试验,研究了吸气对喷嘴内的压力变化和脉冲射流峰值打击力的影响。通过研究淹没条件下10-16-125-75和8-14-85-60结构参数喷嘴在不同吸气根数下的腔套内各测点压力及峰值打击力的变化,得出不同结构喷嘴的压力和峰值打击力随吸气量的增大而逐渐提高,存在最优吸气量使脉冲射流峰值打击力最大。通过研究淹没条件下结构参数分别为8-14-85-60、10-16-105-75、14-28-125-105的喷嘴在不吸气及吸气根数为4情况下的射流峰谷差及峰值打击力,得出三种喷嘴在吸气时的射流峰值打击力分别提高45%~78%、40%~46%、22%~38%。研究表明:对于不同结构参数喷嘴,吸气可提高射流压力波动值和峰值打击力,随上喷嘴直径和振荡腔内容积的增大,该吸气方式对射流打击力的提高程度呈减小趋势。结果对进一步研究淹没条件下自激吸气式脉冲射流喷嘴特性具有指导意义。

Experimental research on the pressure changes of self-excited inspiratory pulsed jet nozzle in submerged condition

Self-developed test equipments in submerged condition are used and a lot of experiments on the features of self-excited air-breathing pulse jet nozzle are conducted to analyze the effect of air suction to nozzle pressure changes and the peak of hitting power.The results obtained indicate that the nozzle pressure of each point increases as the amount of suction decreases;The nozzle pressure of different structures gradually increases with the suction increases,and hitting power with pulse jet peak is also gradually strengthened with the suction increases,but there exists a point of optimal inspiration capacity to make the pulse jet hitting power to the peak maximum.These results meaningfully direct the further study about the features of suction-type self-excited pulsed jet nozzle in submerged condition.