Supercavitating flow around high-speed underwater projectile near free surface induced by air entrainment

被引:36
作者
Xu, Chang [1 ,2 ]
Huang, Jian [1 ,2 ]
Wang, Yiwei [1 ,2 ]
Wu, Xiaocui [1 ,2 ]
Huang, Chenguang [1 ,2 ]
Wu, Xianqian [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
来源
AIP ADVANCES | 2018年 / 8卷 / 03期
基金
中国国家自然科学基金;
关键词
FRICTION DRAG REDUCTION; CLOUD CAVITATING FLOW; LARGE-EDDY SIMULATION; NUMERICAL-SIMULATION; SPECIAL EMPHASIS; WAVE PATTERN; PREDICTION; TURBULENCE; HYDROFOIL; BUBBLE;
D O I
10.1063/1.5017182
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Cavitating flow near free surface is a complicated issue and may provide new inspiration on high-speed surface cruising. This study observes stable supercavitating flow as a new phenomenon in a launch experiment of axisymmetric projectile when the upper side of the projectile coincides with the free surface. A numerical approach is established using large eddy-simulation and volume-of-fluid methods, and good agreements are achieved between numerical and experimental results. Supercavity formation mechanism is revealed by analyzing the experiment photographs and the iso-surface of 90% water volume fraction in numerical results. The entrainment of a large amount of air into the cavity can cause the pressure inside the cavity to similarly increase with the pressure outside the cavity, which makes the actual cavitation number close to zero and is similar to supercavitation. Cases with various headforms of the projectile and cavitation numbers on the cavitating flow, as well as the drag reduction effects are further examined. Results indicate that the present strategy near the free surface could possibly be a new effective approach for high-speed cruising after vigorous design optimization in the future. (c) 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.
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页数:17
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