自激振荡脉冲射流装置的固有频率特性

The natural frequency characteristic of the self-excited oscillation pulsed water jet device

运用流体网络理论建立了自激振荡脉冲射流装置的相似网络模型 ,数值计算分析了系统频率特性 .计算表明 ,该喷嘴装置具有压力谐振特性和低通滤波特性 ,其固有频率主要由喷嘴的形状、结构参数和波速决定 ,流体压力和振荡腔长对系统的频率特性影响很大 ,存在产生最大谐振峰值的最佳腔长范围 ,计算结果与实验吻合 .另外还提出了喷嘴的设计准则 .

Based on the theory of fluid network, the mathematical model of the self excited oscillation pulsed water jet device is established, and the dynamic response characteristics of the device are analyzed. The numerical results, coinciding with the tests, clearly show that the device has functions of oscillator and lowpass filter, its natural frequency, which is significantly influenced by the length of oscillation cavity and pressure, is determined by the structure of the nozzle and wave speed. At last, the design standard of the device is put forward in this paper.