低压自激脉冲射流装置频率设计

Frequency design of low pressure self-excited pulsation-jet

自激脉冲喷嘴是一种利用流体内部特性产生脉冲效果的装置,因此其打击力、频率、振幅等效果参数受到运行参数和结构参数的影响,为得到影响自激脉冲效果的重要参数,探索自激现象产生的内在机理,利用Fluent软件对工作压力、上喷直径、腔径、腔长4个因素进行了3水平共计24组实验,并利用JMP软件对打击力、频率和振幅进行了定性分析,得出本次实验的最佳结构配比,通过腔体内部流场分析进一步完善了空化产生的机理,并对结构做出一定优化,提高了自激效果.

Self-excited pulsation jet is a pulse generator using fluid internal characteristics;so its parameters of effect such as hitting force,frequency and amplitude can be affected by operating parameters and structural parameters.In order to get the major parameters influencing the effect of self-excited,explore the intrinsic motivation of the self-excited phenomenon,24 groups of experiments are performed in 3 levels about the four factors：operating pressure,topnozzle diameter,cavity diameter,cavity length.Qualitative analysis about the hitting force,frequency and amplitude is done using the software JMP;as a result,the best structure ratio is obtained;the mechanism of the cavitation is improved by the analysis of the inner flow field;the structure is optimized and the effect of the self-excitation is increased.