双腔室自激振荡喷嘴频率特性研究

Self-excited oscillation frequency feature of a pulsed water jet nozzle with double-chamber

作为对双腔室自激振荡喷嘴这一新型喷嘴的探索,基于流体网络理论建立了双腔室自激振荡脉冲射流喷嘴的相似网络模型,理论分析了双腔室自激振荡喷嘴频率特性。模型计算结果表明:双腔室自激振荡喷嘴结构参数对系统的固有频率有重要的影响,系统结构参数间存在最优匹配关系,并与文献中介绍的单腔室结构参数的最佳配比关系有较大的不同,双腔室自激振荡喷嘴较单腔室自激振荡喷嘴可以提高脉冲射流峰值压力。分析结果对双腔室自激振荡喷嘴结构设计具有一定的借鉴价值。

As an exploration,based on the theory of fluid network,the mathematical model of self-excited oscillation of a pulsed water jet nozzle with double-chamber was established.Its frequency characteristics were analyzed.The result showed that the structural parameters greatly affect the natural frequencies of the device;and also,the optimized ranges among the structural parameters,they are different from those of the nozzles with single chamber;the pulsed water jet nozzle with double-chamber can raise the surge pressure more than the nozzle with single chamber in the same condition.The result was useful to design of pulsed jet nozzles with double-chamber.