摘要
针对超空泡航行体领域亟待明确的航行体机动过程中空泡形态和流体动力特性开展数值模拟研究。基于Logvinovich独立扩张原理建立了离心力作用下的回转运动理论模型和用于求解超空泡航行体回转运动的三维数值计算模型,通过两种计算模型下获得的计算结果进行对比,验证了数值模拟方法的有效性。利用数值模拟方法研究了离心力"拉直"作用对空泡内航行体流体动力特性的影响规律,分析了不同回转角速度下航行体表面压力分布特性。结果表明:随着回转角速度增加,空泡轴线的外移量增大,离心力拉直空泡作用越强烈,将会对回转半径内外两侧空泡的发展的产生较大影响;升力系数和力矩系数呈现"正弦"形态分布,当回转角速度小于1 rad/s时,产生的俯仰力矩对航行体起到"抬头"作用,反之,则产生的俯仰力矩对航行体起到"低头"作用。
Here, numerical simulation was performed for cavitation shape and hydrodynamic characteristics of a natural super-cavitating vehicle in its maneuver process. Based on Logvinovich’s principle of independent expansion, the theoretical model of its rotating motion under action of centrifugal force and the 3-D numerical calculation model for solving rotating motion of the super-cavitating vehicle were established. By comparing calculation results of these two models, the effectiveness of the numerical simulation method was verified. The numerical simulation method was used to study influence laws of centrifugal force’s "straightening" action on hydrodynamic characteristics of the vehicle in cavitation, and analyze pressure distribution characteristics on the surface of the vehicle at different rotating angular velocities. Results showed that with increase in rotating angular velocity, cavitation axis’ s external displacement increases, the centrifugal force’s straightening cavitation action becomes stronger to have greater influence on development of cavitation on both sides of the vehicle’s rotation radius;lift coefficient and moment coefficient present a sinusoidal distribution;when rotating angular velocity is less than 1 rad/s, the generated pitching moment has a "head up" effect on the vehicle;when rotating angular velocity is larger than 1 rad/s, the generated pitching moment has a "head down" effect on the vehicle.
作者
王瑞
刘传龙
赵三飞
祁晓斌
WANG Rui;LIU Chuanlong;ZHAO Sanfei;QI Xiaobin(Northwest Institute of Mechanical and Electrical Engineering,Xianyang 712099,China;China Ship Development and Design Center,Wuhan 430064,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第21期65-70,共6页
Journal of Vibration and Shock
基金
陕西省自然科学基金资助项目(2019JQ-944)。
关键词
回转运动
离心力
泡内压力
数值模拟
rotating motion
centrifugal force
cavitation internal pressure
numerical simulation
作者简介
第一作者:王瑞,男,博士,高级工程师,1984年生;通信作者:刘传龙,男,博士,工程师,1988年生。
