刚性地面爆炸冲击场仿真与试验研究

摘要

以TNT在刚性地面上爆炸过程中不同位置的超压峰值为研究对象,对爆炸冲击条件下的超压数值进行试验与仿真研究.采用ALE算法仿真模拟试验结果.通过比较仿真结果、试验结果以及经验公式理论结果;主要从超压峰值、超压持续时间验证仿真模型的准确性,通过修正模型的参数,对刚性地面爆炸冲击波特性进行有效的预测.另外对经验公式进行一定的修正,得到符合距离炸心位置较近位置的拟合公式.经验证表明,拟合公式适用于刚性地面近炸点位置的超压数值预测.%The overpressure of cylindrical TNT in different locations on the rigid ground surface is the research object.The numerical simulation of the overpressure under explosive shock is carried out.Simulation results are used by ALE algorithm.By comparing the simulation results, the experimental results and empirical formula theory results, the accuracy of the simulation model are verified mainly from the overpressure peak, overpressure arrival time and overpressure duration.By modifying the parameters of the simulation model, the characteristics of the rigid ground explosion shock wave can be validated prediction.The fitting formula of the position closer to the distance from the core is obtained by modifying the empirical formula.It is proved that the fitting formula is suitable for the numerical prediction of the overpressure at the location of the near-burst point on the rigid ground.