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本文利用试验手段研究自激脉冲喷嘴多频敏感的工作特性,针对自激效果对喷嘴及腔体结构及操作参数进行了试验设计和试验,并利用部分析因设计理论对试验数据进行了分析,得出工作压力、上下喷嘴直径、腔长等主因子对自激效果产生重要影响,此外,工作压力与上喷嘴直径,上、下喷嘴直径以及腔长之间具有交互作用。试验条件下,自激脉冲的瞬时打击力可达到连续射流的1.3倍以上,打击力随出流孔径的变化存在最优值。最后利用快速傅里叶变换对打击力的波动频率进行分析。
In this paper, the experimental methods were used to study the multi-frequency sensitive working characteristics of the self-excited pulsed jet nozzle. The design and test of nozzle and cavity structure and operating parameters were carried out according to self-excitation effect. The experimental data were analyzed by using partial factorial design theory. The working pressure, the upper and lower nozzle diameter, cavity length and other major factors have a significant impact on the self-excitation effect, in addition, the working pressure and the nozzle diameter, the upper and lower nozzle diameter and cavity length interaction. Under the experimental conditions, the instantaneous striking force of self-excited pulse can reach over 1.3 times of the continuous jet, and the strike force has the optimal value with the change of outflow aperture. Finally, the use of Fast Fourier Transform to analyze the fluctuation frequency of striking power.