约束空间内爆超压载荷影响因素二维数值模拟

Two-dimensional numerical simulation of the factors influencing the explosion overpressure load inside the confined space

[目的]为了研究炸药运动、初始界面扰动及网格尺寸对舱内爆炸超压载荷的影响规律,[方法]采用五阶WNEO有限差分格式、三阶TVD龙格—库塔法对二维可压缩欧拉方程的空间项和时间项进行数值离散,并基于Fortran平台,自主开发约束空间内爆炸波高精度数值计算程序,利用所开发的程序对舱内爆炸超压载荷的影响因素进行初步探讨。[结果]研究表明,增大炸药运动速度、选取特定的初始界面扰动、减小网格尺寸均能较明显地提高舱内爆炸冲击波峰值,但对准静态超压载荷的影响较小。[结论]研究结果可为抗爆结构设计及舱内爆炸毁伤评估提供一定的参考和指导。

[Objectives]In order to study how dynamic motion of explosive,initial interface disturbance and grid size affect the overpressure load of internal explosion,[Methods]the spatial and temporal terms of the two-dimensional compressible Euler equations are discretized numerically using the fifth-order WNEO finite difference scheme and the third-order TVD Runge-Kutta scheme.Based on Fortran platform,an in-house high-precision numerical calculation program of blast wave in confined space was developed.The impacts of the overpressure load of the internal explosion were preliminarily discussed adopting the developed program.[Results]The results show that,increasing charge movement speed,selecting a specific interface disturbance and decreasing the size of the grid can significantly increase shock wave peaks of internal explosion,but has little effect on quasi-static overpressure load.[Conclusions]The research in this paper can provide certain reference and basis for the design of anti-explosion structure and the evaluation of internal explosion damage.