喷嘴几何参数对自激吸气脉冲射流性能影响的正交试验

为确定自激吸气脉冲射流喷嘴的几何参数及其交互作用对其性能影响的显著性及重要性次序,运用正交试验的方法,对自激吸气脉冲射流喷嘴的吸气性能和冲击性能进行试验研究,并通过极差分析和方差分析研究了喷嘴面积比、相对腔内面积、相对腔长等因素及其交互作用对装置的吸气性能和冲击性能影响的敏感性.2种分析方法得到的结果一致表明,自激吸气脉冲射流喷嘴几何参数对吸气性能影响的主次顺序依次为相对腔长、相对腔内面积、相对腔长与相对腔内面积的交互作用、喷嘴面积比与相对腔内面积间的交互作用、喷嘴面积比;几何参数对喷嘴冲击性能影响的主次依次顺序为:喷嘴面积比、相对腔内面积、相对腔长与喷嘴面积比的交互作用、相对腔长,其中前两者对喷嘴冲击性能影响远大于后两者.验证性试验证实了正交试验结论.

Orthogonal experimental on effect of geometrical parameters on self-excited inspiration pulsed jet nozzle performance

In order to determine the geometrical parameters of the self-excited pulsed jet nozzle and the significance and importance of the order that their interactions affect its performance. The experiment on the inspiratory performamce and impact property of the self-excited inspiration pulsed jet nozzle was conducted by the orthogonal experiment method, and the nozzle area ratio, relative oscillation cavity area, relative cavity length and the sensitivity of their interactions to the inspiratory performance and impact property of the device were anedyzed by range analysis and variance analysis. The results show that the geometrical parameters that affect the inspiratory performance in descending order are: relative cavity length, relative oscillation cavity area, the interaction between relative oscillation cavity area and relative cavity length, the interaction between nozzle area ratio and relative oscillation cavity area, nozzle area ratio. The geometrical parameters that affect the impact property in descending order are: nozzle area ratio, relative oscillation cavity area, the interaction between of relative oscillation cavity area and relative cavity lengthis, relative cavity length among them, the former two contribute is much greater the nozzle impact property than the latter two to verifying tests confirmed the conclusions of orthogonal experiment.