尾翼EFP成型及气动的数值模拟

Numerical Simulation of Fin EFP Forming and Aerodynamics

为了研究尾翼EFP的成型及飞行过程中的气动特性,用LS-DYNA模拟EFP的成形,将获得的EFP通过UG软件实现外形数据的传递。用Fluent软件进行气动分析,得到EFP在不同起爆半径,不同攻角下的阻力系数、升力系数、稳定储备量等气动参数。结果表明起爆半径影响EFP的长径比和速度,继而影响其升力系数,阻力系数,静稳定储备量,且起爆半径在0.2D~0.3D时更有利于发挥EFP的毁伤效应。

In order to study the formation of the Fin EFP and the aerodynamic characteristics during flight,LS-DYNA is used to simulate the formation process of the Fin EFP,and the FIin EFP will be obtained through UG software to realize the transmission of the shape data.The aerodynamic analysis is carried out with the fluid mechanics calculation software Fluent,and the aerodynamic parameters such as the drag coefficient,the lift coefficient and the stable reserve amount of the warhead at different detonation radii and different angles of attack are obtained.The results show that the detonation radius affects the length-diameter ratio and speed of the EFP,and then affects its lift coefficient,drag coefficient,and static stability reserve.Through comprehensive analysis,it is found that when the detonation radius is between 0.2D and 0.3D,it is more conducive to exert the damage effect of EFP.