基于气固两相反应流的温压炸药能量释放规律数值模拟及实验验证

Numerical Simulation and Experimental Verification on the Energy Release Law of Thermostatic Explosive Based on Gas-Solid Two-phase Reaction Flow

为研究气体环境、铝粉含量、空间体积对温压炸药能量释放的影响,基于气固两相反应流模型,建立有限差分-物质点耦合算法,对温压炸药密闭容器内爆炸流场演化进行数值模拟及实验验证。结果表明,温压炸药在空气环境中爆炸释放的能量高于氮气中,壁面冲击波峰值压力和空间准静态压力的增幅分别在20%和80%以上,空间准静态压力随空间体积的增大呈先增大后减小的趋势;铝粉含量越高,冲击波在传播过程中衰减得越慢,空间准静态压力越高;铝粉燃烧反应度随空间体积的增加而下降,当比空间体积超过100m^(3)/kg时,反应度下降到90%以下,且铅粉含量越高,其反应程度越低。

In order to study the influence of gas environment,aluminum content and space volume on the energy release of thermobaric explosives(TBX),a coupled finite difference and material point method was established to simulate and test the explosion flow field evolution in the closed container of thermobaric explosive,which was based on the gas-solid two-phase reaction flow model.The results show that the explosion energy of TBX in air is higher than that in nitrogen.The peak pressure and the quasi-static pressure are increased by more than 20%and more than 80%respectively,and the quasistatic pressure increases first and then decreases with increasing the space volume.In addition,the higher the content of the aluminum powder is,the more slowly the explosion wave decays and the higher the quasi-static pressure is.The combustion reaction degree of aluminum powder decreases with the increase of space volume.The reaction degree of aluminum powder decreases to below 90%when the specific space volume exceeds 100m^(3)/kg,and the higher the content of the aluminum powder is,the lower the reaction degree is.