流体机械2025，Vol.53Issue(2)：41-49,9.DOI:10.3969/j.issn.1005-0329.2025.02.006
超声振动边界下亥姆赫兹腔室空化性能及涡行为分析
Analysis of cavitation performance and vortex behavior in Helmholtz cavity under ultrasonic vibration boundary
摘要
Abstract
To improve the working ability of Helmholtz self-excited waterjets,LES was used in the flow of the cavity using UDF dynamic grid-driven ultrasonic focusing vibration boundary,and the reliability of the model was verified by comparing the simulated and experimental values of the outlet pressure.The study explored how external ultrasonic vibration and varying frequencies influenced self-excited frequency,velocity,and cavitation.From the perspective of energy conversion,the reason for the enhanced shear characteristics inside the chamber is revealed.The vapor phase distribution in the lower chamber under various conditions was compared,and the jet performance of each section of the jet structure was analyzed.Explained the development process of periodic vortex structures under ultrasonic excitation.The results show that when the ultrasonic excitation at 25 kHz compared to ordinary jet,the natural oscillation frequency soared 3.14-fold,main frequency and amplitude became more pronounced,though jet speed marginally decreased(1.89%).Higher excitation frequencies didn't significantly curb speed.The ultrasonic excitation bolstered energy transfer and vortex feedback,intensifying shear and raising vapor phase content(0.5≤y/r2≤0.81)in the outlet.The ability of self-excited oscillating cavitation waterjets can be significantly improved.The research results can provide theoretical basis for the application of Helmholtz type self oscillating jet.关键词
自振空化射流/超声聚焦振动/动网格技术/涡结构Key words
self oscillating cavitation waterjets/ultrasonic focused vibration/dynamic mesh/vortex structure分类
数理科学引用本文复制引用
侯博文,方珍龙..超声振动边界下亥姆赫兹腔室空化性能及涡行为分析[J].流体机械,2025,53(2):41-49,9.基金项目
国家自然科学基金青年项目(51706161) （51706161）
海南省重大科技计划项目(ZDKJ202015) （ZDKJ202015）
