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CLC number: TH161.12

On-line Access: 2017-07-04

Received: 2016-07-29

Revision Accepted: 2016-10-09

Crosschecked: 2017-06-12

Cited: 0

Clicked: 3039

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jun Zou

http://orcid.org/0000-0003-2443-3516

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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.7 P.545-552

http://doi.org/10.1631/jzus.A1600537


Experimental investigation of vortex-ring cavitation


Author(s):  Chen Ji, Fang-ye Lin, Jun Zou

Affiliation(s):  State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   junzou@zju.edu.cn

Key Words:  Cavitation, Toroidal cavity, Oscillation period, Impinging on wall


Chen Ji, Fang-ye Lin, Jun Zou. Experimental investigation of vortex-ring cavitation[J]. Journal of Zhejiang University Science A, 2017, 18(7): 545-552.

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Abstract: 
Vortex-ring cavitation occurs when the pressure inside a torus-shaped core of a vortex ring falls below the vapor pressure of the ambient liquid. By generating a vapor bubble in a rigid tube, a toroidal cavity can be produced outside the tube. The pulsation and propagation behaviors of vortex-ring cavitation are studied using a high-speed video camera and a hydrophone. The experimental results show that the cavity continues to oscillate with a period that depends heavily on the maximal cross-section radius of the cavity and circulation of the vortex flow, under the influence of the surrounding vortex flow field. It is also shown that the cross-radial oscillation of the toroidal cavity can be measured both by a high-speed camera and hydrophone. Moreover, three different methods for estimating the circulation are compared to propose an accurate model of toroidal cavity oscillation. The phenomenon of a toroidal cavity impinging on a fixed wall is also investigated.

涡环空化的实验研究

目的:研究涡环空化产生的环状空泡的振荡周期及其冲击壁面溃灭的动态过程。
创新点:1. 通过实验方法,比较几种不同的速度环量计算模型在环状空泡振荡控制方程中的适用性。2. 通过声学方法,得到环状空泡在撞击壁面溃灭过程中的频谱特征。
方法:1. 通过管内空泡膨胀产生高速射流;高速射流在管口处形成涡环并发生涡环空化。2. 基于高速摄像进行流体分析。
结论:1. 在管内空泡溃灭后,环状空泡以恒定速度沿管的轴向运动,且其振荡周期几乎保持不变。2. 环状空泡的振荡周期基本上满足规律:τ~R0(ρP)0.5[ln(8/ε)]0.5。3. 在空泡振荡的最小直径为特征直径;根据空心涡核模型,可以计算得到最接近实验结果的速度环量值。4. 当空泡冲击壁面时,空泡的环向直径将变大。5. 环向直径的最大扩张比α与其截面直径与环向直径的比ε相关:α~ε0.25

关键词:空化;环状空泡;振荡周期;壁面冲击

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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