基于嵌套网格的超声速子母弹分离数值分析  

Numerical Analysis of Separation of Supersonic Submunition Based on Nested Grid

作　　者：张曼曼 姜毅[1] 程李东 杨桦 刘琦[2] ZHANG Manman;JIANG Yi;CHENG Lidong;YANG Hua;LIU Qi(School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;Beijing Institute of Space Launch Technology, Beijing 100071, China)

机构地区：[1]北京理工大学宇航学院,北京100081 [2]北京航天发射技术研究所,北京100071

出　　处：《兵工学报》2019年第1期79-88,共10页Acta Armamentarii

基　　金：国防基础科研计划项目(B0420132805)

摘　　要：为研究超声速下子母弹分离流场和气动特性,采用嵌套网格技术和有限体积法离散求解三维黏性可压缩流的Navier-Stokes方程,同时建立6自由度刚体的运动学方程与动力学方程。将6自由度刚体运动与计算流体力学耦合,数值模拟超声速下子母弹分离过程,研究子母弹分离过程的流场特性和子弹初始分离状态(如子母弹初始分离时子弹飞行速度及其初始姿态角等)对其分离过程的影响。结果表明:嵌套网格技术可以很好地模拟超声速下子母弹分离的复杂干扰流场;超声速条件下,子弹脱开母弹时的飞行速度和子母弹初始分离速度越大,分离攻角越小,各个弹体之间可以更安全快速地分离。To study the separation flow field and aerodynamic characteristics of supersonic submunition,the nested grid technique and the finite volume method are used to discretize Navier-Stokes equations of three-dimensional viscous compressible flow,and simultaneously solve the kinematic equations and dynamics equations of 6-degree-of-freedom( DOF) rigid body. The 6-DOF rigid body motion is coupled with computational fluid dynamics( CFD) to simulate the separation process of submunition at supersonic speed. The characteristics of flow field in the separation of submunition and its initial separation state( such as initial flight velocity and initial attitude angle,etc) were analyzed. The results show that the nested grid technique can be well used to simulate the complex interferent flow field of supersonic submunition. Under the supersonic separation condition,the higher the initial flight speed is when a submunition is removed from cluster munition,the smaller the separation angle of attack is,and the submunition can be separated more quickly and safely.

关 键 词：子母弹分离 嵌套网格 数值模拟 计算流体力学 6自由度 

分 类 号：TJ762.2[兵器科学与技术—武器系统与运用工程]