摘要
高速航行体肩部附着空泡穿越自由液面过程中发生溃灭现象,将产生巨大的冲击载荷,严重影响航行体出水姿态和结构安全性。该研究采用改进型分离涡模型,建立了水下发射非定常空化特性数值模拟方法。结果表明:航行体附着空泡出水过程自上而下发生溃灭现象,在溃灭末期收缩为较小的孤立空泡,溃灭产生的高速射流冲击结构表面;在出水过程中,水面附近的“反向旋转涡对”导致附着空泡发生了快速溃灭现象,以发卡涡为代表的壁面涡旋结构发展明显受到附着空泡的抑制;空泡溃灭末期的孤立泡产生了巨大的冲击压力峰值,对航行体结构安全性将造成巨大破坏。初期航行体迎流侧空泡溃灭行为也会导致较大的压力峰值出现。
During the process of high-speed underwater vehicle exiting-water,when its shoulder to which cavitation is usually attached moves across the free liquid surface,collapse phenomenon occurs,generating huge impact load,seriously affecting the vehicle exiting-water posture and structural safety.To investigate the evolution details of the cavitation flow field and the collapse load characteristics of the vehicle exiting-water process,an improved delayed detached eddy simulation model was adopted.The results show that:the collapse of the cavitation attached to the vehicle during exiting-water process produces from the top to the bottom,and at the end of the collapse,the cavity shrinks to a smaller isolated bubble,the collapse induced high-speed jet gives impacts on the surface of the structure.During the exiting-water process,the counter-rotating vortex pairs near the water surface lead to the rapid collapse of the attached cavitation,and the development of the wall vortex structure represented by the hairpin vortex is obviously inhibited by the attached cavitation.The isolated bubble collapse generates a huge impact pressure peak,which greatly threaten the structural safety of the vehicle.However,the bubble collapse behavior on the facing flow of the vehicle may also lead to the appearance of larger pressure peaks.
作者
高山
施瑶
潘光
GAO Shan;SHI Yao;PAN Guang(School of marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China;Key Laboratory of Unmanned Underwater Vehicle Technology of Ministry of Industry and Information Technology,Xi’an 710072,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第2期306-314,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(52171324,U21B2055)
基础科研项目(JCKY2021607B031,JCKY2021206B012)
中央高校基本业务费(3102019JC006)。
关键词
航行体
出水
空泡
溃灭载荷
发卡涡
vehicle
exiting-water
cavitation
collapse load
hairpin vortex
