自激振荡腔空化特性的数值仿真及试验研究

针对空化效应的剧烈程度，采用亥姆霍兹自振腔喷嘴结构，通过引入3项无量纲结构参数比值，探究了一种恒空化强度下自激振荡腔空化器的结构设计方法。基于Fluent对自激振荡腔进行空化数值仿真研究，重点考察3项无量纲结构参数比值对空化的影响，最后通过试验进行验证，并与多孔孔板空化器进行对比。结果表明：自激振荡腔内明显发生剧烈空化，且在入口压力为1 MPa时，结构参数配比为d2/d1=2，D/d2=5~6，D/L=2，空化效果较好。试验结果与仿真结果较为吻合，且在同一等效通流直径下，该自激振荡空化器比多孔孔板空化器的空化效果好，该研究对自激振荡空化器结构的设计与优化提供一定的借鉴。

Numerical Simulation and Experimental Research on Cavitation of Self-excited Oscillating Cavity

Aimed at the intensity of cavitation effect, the structure design method of self-excited oscillating cavity cavitation device with constant cavitation intensity is studied by using Helmholtz self-oscillating cavity nozzle structure and introducing three dimensionless structural parameters ratio. The cavitation numerical simulation of self-excited oscillating cavity is carried out based on Fluent. The effect of three dimensionless structural parameters on cavitation is investigated by numerical simulation. Finally, it is verified by experiments and compared with the porous orificeplate cavitation device. The results show that the cavitation is intense in the self-excited oscillatingcavity.When the inlet pressure is 1 MPa and the ratio of structural parameters is d2/d1=2, D/d2=5~6 and D/L=2, the cavitation effect is better. The experimental results are in good agreement with the simulation results, and the cavitation effect of the self-excited oscillation cavity cavitation device is better than that of the porous orifice plate cavitation deviceunder the same equivalent flow diameter. This study provides some reference for the structuredesign and optimization of the self-excited oscillating cavitation device.