强爆炸早期火球光辐射能谱的分群计算

Calculation of Energy Spectrum of Early Fireball Radiation in Strong Explosion with Multi-group Method

以辐射流体力学为基础,利用多群方法建立了强爆炸火球光辐射的多群辐射流体力学模型。采用空气分群吸收系数,构建有限差分格式,计算了火球早期光辐射分群能谱,给出了光辐射总能量分布以及分群能谱随时空的变化关系,为进一步研究火球光辐射能谱特征提供了可能。

On the basis of radiation hydrodynamics,a multi-group radiation hydrodynamics model was established for numerical simulation of the strong explosion fireball radiation by means of multi-group method.The radiation energy spectrum of early fireball was calculated through finite difference method with the help of air absorption coefficient depended on the group of photon energy,and it gave the relation between distributions of total radiation energy and energy spectrum in space and time.The result can make it possible to do more research on the fireball radiation in the future.