【摘要】 高精度数值模拟方法在具有化学反应及强间断的炸药爆轰问题数值模拟中具有重要的应用价值.本文通过求解柱坐标系下二维轴对称反应流欧拉方程组,采用基于Level set界面捕捉方法的欧拉型高精度多介质数值方法,编写了凝聚相炸药非理想爆轰程序,并对TATB基炸药在拐角效应中的死区现象进行了数值模拟研究.通过对比基于压力的点火增长模型与基于熵函数的CREST反应燃烧模型在拐角死区问题的计算效果,分析了两种反应模型的优势与不足,并结合两者的优点提出了一种多判据反应速率模型.数值模拟结果表明,该模型可以直接对死区进行计算,且死区高度与实验结果较为一致.更多还原

【Abstract】 High-resolution scheme presents an important application value in discontinuous problems, such as in explosive detonation with high pressure. In this study, a high-resolution Eulerian reaction hydrodynamic code is written based on a two-dimensional axisymmetry in a cylindrical coordinate system. The Level-set method is used to track the motion interface between the explosive/reaction product and inert medium. The entropy-based CREST model and pressure-based ignition and growth model are both used to calculate the detonation diffraction at the corner turning in the TATB-based explosive. A multi-criterion reaction-rate model, which combines the two aforementioned reaction models, is also proposed. The results show that the multi-criterion reaction model can directly calculate the dead zone without extra desensitization modification, and the height of the dead zone is basically consistent with that in the experiment.更多还原