任意边界船艏入水的PIV测试与流动特性研究  

PIV measurements and flow characteristics of water entry of arbitrary bow

作　　者：佘文轩 郭春雨[2] 周广利[2] 吴铁成[2,3] 郐云飞 SHE Wen-xuan;GUO Chun-yu;ZHOU Guang-li;WU Tie-cheng;KUAI Yun-fei(School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China;College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China;School of Marine Engineering and Technology,Sun Yat-sen University,Zhuhai 51900,China)

机构地区：[1]浙江大学航空航天学院,杭州310027 [2]哈尔滨工程大学船舶工程学院,哈尔滨150001 [3]中山大学海洋工程与技术学院,广东珠海519000

出　　处：《船舶力学》2021年第11期1452-1460,共9页Journal of Ship Mechanics

基　　金：装备预先研究项目(41407010501);基础产品创新科研项目(CZ380);中央高校基本科研业务费专项资金资助项目(3072020CFT0104);中央高校基本科研业务费项目(3072020CF0108)。

摘　　要：为了探究曲率复杂的任意边界船艏入水过程中细节流场结构的动态演变与砰击过程中流动分离、卷气等复杂现象的发生机理,本文应用高频响的时间解析PIV(TR-PIV)技术对船艏模型以不同初速度入水过程中的流场进行动态捕捉,详细分析了其运动响应与流场结构。测试结果表明:较低入水初速度时,初次砰击到二次砰击有缓慢过渡过程,船艏内凹壁面会引导射流形成低速回流,而船艏外飘部分压迫水体产生流动鞍点,并由于无滑移壁面作用,会在内凹壁面处形成强剪切层;较高入水初速度时,会发生剧烈的二次砰击作用,主要是由于高速的射流发生流动分离,直接脱离船艏底端,与外飘部分相互作用,形成闭合气腔,并在气腔顶端形成流动鞍点,同时椭圆形气腔受压缩逐渐向圆形发展。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.

关 键 词：任意边界船艏 时间解析PIV技术 二次砰击 鞍点 射流 

分 类 号：U661.31[交通运输工程—船舶及航道工程]