含铝炸药Miller能量释放模型的应用

Application of Miller Energy Release Model for Aluminized Explosive

AUTODYN数值模拟结果揭示Jing Ping Lu提供的PBXW-115点火生长模型参数低估了后期铝粉的燃烧放热。讨论了人工粘性、网格密度对计算结果的影响:较大的人工粘性系数和较粗的网格会严重抹平冲击波峰值压力,但对冲量影响较小。根据Bocksterner水下爆炸实验测试峰值压力和冲量反推Miller能量释放模型参数,目标函数中冲量的加权系数取峰值压力加权系数的两倍,反推出的Miller能量释放模型参数更能反映含铝炸药的能量输出结构。

Numerical simulation results with AUTODYN software revealed Jing Ping Lu＇s parameters of PBXW-115 ignition and growth model underestimate energy release of Al powders combustion. The effects of artificial viscosity coefficient and mesh density on simulation results were discussed. The larger artificial viscosity coefficients and coarser meshes can smear off peak pressure of shock wave severely, but affect impulse little. Based on Bocksterner＇s underwater explosion experimental results, parameters of Miller energy release model were solved inversely. Weighted coefficient of impulse was twice as much as that of peak pressure in objective function. New model parameters obtained from underwater explosion test can express the size effect of aluminized explosive and can be applied to numerican simulation of near field and far field, while Lee-Trave model parameters can only be applied to the numerical simulation of near field and small yield underwater explosion.