PIV measurements and flow characteristics of water entry of arbitrary bow

被引：0
|
作者：
She W.-X. [1 ,2 ]
Guo C.-Y. [2 ]
Zhou G.-L. [2 ]
Wu T.-C. [2 ,3 ]
Kuai Y.-F. [2 ]
机构：
[1] School of Aeronautics and Astronautics, Zhejiang University, Hangzhou
[2] College of Shipbuilding Engineering, Harbin Engineering University, Harbin
[3] School of Marine Engineering and Technology, Sun Yat-sen University, Zhuhai
来源：
Chuan Bo Li Xue/Journal of Ship Mechanics | 2021年 / 25卷 / 11期
关键词：
Arbitrary bow; Saddle point; Secondary impact; Time-resolved PIV; Water jet;
D O I：
10.3969/j.issn.1007-7294.2021.11.002
中图分类号：
学科分类号：
摘要：
In order to study the dynamic evolution of flow field and the causes of complex phenomenon such as flow separation and gas entrainment during the water entry of arbitrary bow, the high frequency time-resolved PIV (TR-PIV) technique was used to dynamically capture the flow field of bow model at different initial velocities. Its motion response and flow field structure were analyzed in detail. The results show that there is a slow transition process from the initial impact to the secondary impact, and the concave bow surface guides the water jet to form a low-speed reflow, while the bow flare forces the fluid to generate a flow saddle point, and a strong shear layer is formed at the inner bow wall because of the effect of no-slip wall when the initial velocity of bow model is lower. However, with the rapid increase of the initial velocity, a severe secondary impact occurs in that the high-speed water jet is separated from the bottom of bow model and directly interacts with the bow flare. Therefore, a closed air cavity is formed, and a flow saddle point appears at the top of the air cavity. Meanwhile, the elliptical air cavity is gradually compressed toward a circular shape. © 2021, Editorial Board of Journal of Ship Mechanics. All right reserved.
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页码：1452 / 1460
页数：8
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