采用动网格技术的弹托分离仿真模型

Simulation model for sabot discard using dynamic mesh technique

针对一体化弹丸出炮口后弹托由与弹体接触到绕弹托质心做六自由度运动的过程,提出一种基于弹托分段分离运动并采用动网格技术耦合流体控制方程和六自由度运动方程的弹托分离仿真模型。以尾翼稳定脱壳穿甲弹为例,仿真分析不同马赫数下的弹托分离情况,并探讨弹托和弹体气动系数在分离过程中的变化情况。仿真结果表明:弹托分离马赫数越大,分离轨迹越靠近弹体且分离时间越短,但对地分离横向位移越大。通过与试验数据的对比,验证了所提弹托分离仿真模型的准确性。

Aimed at the changing progress that sabot moves from contacting to the projectile′s body to doing 6-DOF(degree of freedom)motion revolving around sabot′s centroid,a simulation model for sabot′s discard based on motion separation and coupling the fluid control equation and 6-DOF equation by using dynamic mesh was proposed.Taking APFSDS(armor piercing fin stabilized discarding sabot)for example,this model was used to simulate the sabot′s discard under different Mach numbers and analyze the variations of dynamic coefficients of sabot and projectile body.Simulation results show that the bigger the discard Mach number is,the closer to projectile′s body the sabot′s trajectory is,and also the shorter the discard time is,but the further the discard distance is.The validity of the proposed sabot′s discard simulation model was verified by a comparison with the experiment data.