初始扰动对高速射弹尾拍过程流体动力特性与弹道特性的影响  

The Influence of Initial Disturbance on the Hydrodynamic and Ballistic Characteristics of High-speed Projectile during Tail Slapping

作　　者：姚忠[1] 王瑞[1] 祁晓斌 徐保成[1] 王佳雯[1] 梁景奇 YAO Zhong;WANG Rui;QI Xiaobin;XU Baocheng;WANG Jiawen;LIANG Jingqi(Northwest Institute of Mechanical&Electrical Engineering,Xianyang 712099,Shaanxi,China)

机构地区：[1]西北机电工程研究所,陕西咸阳712099

出　　处：《兵工学报》2020年第S01期46-53,共8页Acta Armamentarii

基　　金：陕西省自然科学基金项目(2019JQ-944)。

摘　　要：为研究初始扰动对超空泡射弹尾拍过程中流体动力特性和弹道特性的影响规律,进行了射弹流场与弹道耦合计算。基于有限体积法和流体体积函数多相流模型,考虑水相的压缩性,应用刚体动力学理论构建3自由度运动模型,并结合动网格技术建立耦合求解流场和射弹运动的非定常仿真模型。计算分析了射弹在相同初始速度、不同初始扰动角速度下流体动力和弹道特性的变化规律。研究结果表明:不同初始扰动角速度使得射弹尾拍运动的俯仰角、俯仰角速度、流体动力系数呈周期性变化,随着尾拍动态稳定的形成,其幅值和周期最终趋于恒定值;初始扰动对射弹的水平速度影响较小,但对垂直位移影响较大,最终影响弹道特性。The influence of initial disturbance on the hydrodynamic and ballistic characteristics of supercavitating projectiles in the process of tail-slapping is studied.Based on the finite volume method and VOF multiphase flow model,a three-degree-of-freedom(3DOF)motion model is constructed by using rigid body dynamics theory in considering the compressibility of water phase.And a coupled simulation model of tail-slapping flow field and trajectory of supercavitating projectile is established by combining the dynamic grid technology.The influence of initial disturbance angular velocity on the evolution of flow field,hydrodynamic characteristics and trajectory parameters of projectile in underwater tail-slapping motion is studied.The results show that the pitch angle,pitch angular velocity and hydrodynamic coefficient of projectile's tail-slapping motion change periodically with different initial disturbance angular velocity.And with the formation of dynamic stability of tail slapping,its amplitude and period eventually tend to constant value;the initial disturbance has little effect on the horizontal velocity of projectile,but has great effect on the vertical displacement,and finally affects the ballistic characteristics.

关 键 词：超空泡射弹 尾拍运动 初始扰动 流场与弹道耦合计算 流体动力特性 弹道特性 

分 类 号：TJ413.9[兵器科学与技术—火炮、自动武器与弹药工程]