基于ALE算法的爆破战斗部爆炸效应数值模拟研究

Numerical Simulation of Blasting Warheads Exploding Based on ALE Method

采用Arib itrary Lagrange-Eu ler(ALE)算法对爆破战斗部在空气中的爆炸效应进行了数值模拟研究。在建模过程中,炸药采用ALE单元,壳体采用Lagrange单元,空气采用Eu ler单元,同时建立炸药产物在其中流动的ALE初始空间网格,炸药和初始空间网格之间采用共用节点连接,炸药、壳体与空气网格之间定义耦合。计算得到了爆炸产物的飞散特性、压力场的分布规律和距爆心不同距离处的爆炸超压值。进行了地面试验验证,通过对比分析表明,模拟结果与试验结果之间的相对误差小于10%。

Using the Arbitrary Lagrangian-Eulerian （ALE） algorithm, the numerical simulation of the blasting warheads exploding in the air is realized. During the modeling process, the explosive was plotted with ALE elements, the shell with Lagrange elements and the air with Euler elements, the ALE meshes of the initial void were created in which the explosive products could flow, the meshes of explosive and the initial void were joined with common nodes, and the fluid-structure interaction was defined between the meshes of the explosive, shell and air. The diffusion of explosive products and the pressure distribution were obtained. The overpressure values at different distance to the explosion center were presented. The results show that the relative errors between the simulation results of overpressure and the experimental results at different distance to explosion center is less than 10%.