Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile

doi:10.1016/j.oceaneng.2021.109682

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile
	Xu C(徐畅)3; Huang J(黄荐)1,2; Yu C(余超)1,2; Wang YW(王一伟)1,2; Huang CG(黄晨光)1,2; Khoo, Boo Cheong 3
刊名	OCEAN ENGINEERING
	2021-10-15
卷号	238 页码:16
关键词	Unsteady cloud cavitation Moderate cavitation number Free surface effect Near-wall effect
ISSN号	0029-8018
DOI	10.1016/j.oceaneng.2021.109682
通讯作者	Xu, Chang(e0348786@u.nus.edu) ; Wang, Yiwei(wangyw@imech.ac.cn)
英文摘要	For high-speed underwater vehicles, cavitation can be one of the most important speed barriers. The cavitating flow can be even complex when an underwater vehicle is sailing close to the free surface/wall. In this study, the mutual effects of the free surface and near-wall on the cloud cavitating flow that surrounds an axisymmetric projectile are investigated by water tank experiment and the computational fluids dynamics (CFD). The Split-Hopkinson pressure bar (SHPB) technology is applied in the experiment to accelerate the projectile in a short time. In our numerical approach, the volume of fluid (VOF) method, the large eddy simulation (LES) turbulence model, and the Zwart-Gerber-Belamri (ZGB) cavitation model are used. The cloud cavitating flow under the free surface/wall effect is investigated by changing the distance between the projectile and free surface (d(f)) or wall (d(w)). Both the experiment and the simulation show that the unstable cavity evolution includes four stages induced by the re-entrant jet: cavity growth, re-entrant jet, cavity shedding and collapsing. The results further show that as d(f) decreases, the cavity length is shorter and the cavity becomes more stable; as d(w) decreases, the cavity length is longer and the cavity becomes less stable. By understanding the free surface/wall effect on the stability of the cloud cavitating flow, the parameters space spanned by d(f) and d(w) can be divided into several distinct flow regimes, in which the entire shedding cavity (symmetry/asymmetry), steady and non-shedding cavity, partial cavity shedding, and ventilated cavity are identified.
分类号	一类
资助项目	National Natural Science Foundation of China[11772340] ; National Natural Science Foundation of China[11672315] ; Youth Innovation Promotion Association CAS[2015015]
WOS关键词	LARGE-EDDY SIMULATION ; NUMERICAL-SIMULATION ; HYDROFOIL ; VORTICITY ; DYNAMICS
WOS研究方向	Engineering ; Oceanography
语种	英语
WOS记录号	WOS:000696802000003
资助机构	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
其他责任者	Xu, Chang ; Wang, Yiwei
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87447]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 3.Natl Univ Singapore, Dept Mech Engn, Singapore 119260, Singapore;
推荐引用方式 GB/T 7714	Xu C,Huang J,Yu C,et al. Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile[J]. OCEAN ENGINEERING,2021,238:16.
APA	徐畅,黄荐,余超,王一伟,黄晨光,&Khoo, Boo Cheong.(2021).Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile.OCEAN ENGINEERING,238,16.
MLA	徐畅,et al."Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile".OCEAN ENGINEERING 238(2021):16.