爆轰计算JWL状态方程参数的不确定度

Uncertainty quantification for JWL EOS parameters in explosive numerical simulation

针对爆轰计算JWL状态方程参数,开展不确定度量化研究。首先从JWL状态方程性质出发,结合数学、物理分析确定JWL状态方程中主要参数R1的概率分布范围,然后利用非嵌入多项式混沌展开方法对PBX9404炸药驱动飞层外界面速度进行了不确定度量化分析。给出的分析方法与分析流程对爆轰计算及其他工程数值模拟不确定度量化有一定参考作用。

The JWL EOS parameters are very important in numerical simulations on explosives,which can be affirmed from cylinder experiments.But in actual computations,these parameters may depart from the original ones.So aimed to the JWL EOS parameters,the uncertainty quantification was explored.The distribution of the main parameter R1 was given with mathematical and physical analyses.And the uncertainty quantification analysis was carried out for the velocity at the outer interface of the copper flyer driven by the PBX9404 explosive.The analysis method used in the paper is helpful for the uncertainty quantification in detonation calculations and other engineering simulations.