Dynamics of isolated vortex cavitation

被引：69
作者：
Pennings, P. C. [1 ,2 ]
Bosschers, J. [3 ]
Westerweel, J. [2 ]
van Terwisga, T. J. C. [1 ,3 ]
机构：
[1] Delft Univ Technol, Dept Mech Maritime & Mat Engn, Lab Ship Hydrodynam, NL-2628 CD Delft, Netherlands
[2] Delft Univ Technol, Dept Mech Maritime & Mat Engn, Lab Aero & Hydrodynam, NL-2628 CD Delft, Netherlands
[3] Maritime Res Inst Netherlands, NL-6708 PM Wageningen, Netherlands
来源：
JOURNAL OF FLUID MECHANICS | 2015年 / 778卷
关键词：
cavitation; hydrodynamic noise; vortex dynamics; EMISSION;
D O I：
10.1017/jfm.2015.379
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The dynamic behaviour of vortex cavitation on marine propellers may cause inboard noise and vibration, but is not well understood. The main goal of the present study is to experimentally analyse the dynamics of an isolated tip vortex cavity generated at the tip of a wing of elliptical planform. Detailed high-speed video shadowgraphy was used to determine the cavity deformations in combination with force and sound measurements. The cavity deformations can be divided in different modes, each of which show a distinct dispersion relation between frequency and wavenumber. The dispersion relations show good agreement with an analytical formulation. Finally, experimental support is given to the hypothesis that the resonance frequency of the cavity volume variation is related to a zero group velocity.
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收藏
页码：288 / 313
页数：26
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