| Free surface and near-wall effects on the cloud cavitating flow over an axisymmetric projectile | |
Xu C(徐畅)1; Huang J(黄荐)2,3; Yu C(余超)2,3; Wang YW(王一伟)2,3 ; Huang CG(黄晨光)2,3; Khoo, Boo Cheong1
| |
| Corresponding Author | Xu, Chang([email protected]) ; Wang, Yiwei([email protected]) |
| Source Publication | OCEAN ENGINEERING
 |
| 2021-10-15 | |
| Volume | 238Pages:16 |
| ISSN | 0029-8018 |
| Abstract | 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. |
| Keyword | Unsteady cloud cavitation Moderate cavitation number Free surface effect Near-wall effect |
| DOI | 10.1016/j.oceaneng.2021.109682 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000696802000003 |
| WOS Keyword | LARGE-EDDY SIMULATION ; NUMERICAL-SIMULATION ; HYDROFOIL ; VORTICITY ; DYNAMICS |
| WOS Research Area | Engineering ; Oceanography |
| WOS Subject | Engineering, Marine ; Engineering, Civil ; Engineering, Ocean ; Oceanography |
| Funding Project | National Natural Science Foundation of China[11772340] ; National Natural Science Foundation of China[11672315] ; Youth Innovation Promotion Association CAS[2015015] |
| Funding Organization | National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Xu, Chang ; Wang, Yiwei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/87448 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 1.Natl Univ Singapore, Dept Mech Engn, Singapore 119260, Singapore; 2.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation 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.Rp_Au:Xu, Chang, Wang, Yiwei |
| 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2021F401.pdf（14699KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment