Experimental and numerical investigation of ventilated cavitating flow with special emphasis on gas leakage behavior and re-entrant jet dynamics

被引:75
作者
Wang, Zhiying [1 ]
Huang, Biao [1 ]
Wang, Guoyu [1 ]
Zhang, Mindi [1 ]
Wang, Fufeng [1 ,2 ]
机构
[1] Beijing Inst Technol, Sch Mech & Vechicular Engn, Beijing 100081, Peoples R China
[2] Acad Equipment, Sch Changing Noncommissioned Officers, Beijing 1002249, Peoples R China
基金
中国国家自然科学基金;
关键词
Ventilated cavitating flow; High-speed camera; Gas leakage behavior; Re-entrant jet dynamics; LARGE-EDDY SIMULATION; HYDROFOIL DRAG REDUCTION; UNSTEADY CAVITATION; COMPUTATIONS; MODEL; FLUID;
D O I
10.1016/j.oceaneng.2015.07.063
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
The objective of this paper is to investigate the ventilated cavitating flow structure by combining experimental and numerical methods. A high-speed camera technique is used to record cavity evolution patterns. The numerical simulation is performed by CFX with a free surface model and a filter-based model, and the gravity effect is considered. The results show when the gas entrainment coefficient Q(v), is constant, two typical mechanisms of the gas leakage exist at different Fround numbers Fr, namely toroidal vortices mode and two hollow tube vortices mode. With the increasing of Fr, the cavity would transfer from the two hollow tube vortices to the toroidal vortices. Moreover, when the Fr number keeps constant, the enlargement of the cavity causes the gravitational effect to be more significant for the case of larger value of Q(v). The detail analysis of re-entrant behaviors is also conducted. One type of re-entrant flow is unsteady with air cluster being periodically rejected at the rear of the cavity. The other type of the re-entrant flow shows that the majority of the cavity is transparent, only the region at the tail of the cavity is nontransparent, due to the re-circulation of water back into the cavity. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:191 / 201
页数:11
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