Numerical Study on the Whole Process of Fireball Evolution in Strong Explosion
Numerical Study on the Whole Process of Fireball Evolution in Strong Explosion作者机构：Institute of Applied Physics and Computational Mathematics
出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)
年 卷 期：2019年第71卷第11期
页 面：1388-1392页
核心收录：
学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学]
基 金：Supported by the National Key R&D Program of China under Grant No.2017YFA0403200 China Postdoctoral Science Foundation under Grant No.2018M630114
主 题：fireball phenomenon radiation transfer equation the shock wave brightness
摘 要：With the actual mean free path for radiation in air and a simplified nuclear device, a one-dimension simulation research on fireball phenomenon in a sea level atmosphere is carried out based on the multi-group radiation hydrodynamic codes(RDMG). It is shown that our theoretical calculations can describe the whole process of the fireball evolution for strong explosions from the early X-ray expansion stage to the shock wave propagation stage. The radius of the shock wave and the brightness of the fireball are in good agreement with the experimental results. The whole thermal radiation power curve of the fireball evolution for strong atmospheric explosion at sea level is plotted for the first time. The impact of radiation opacity of the nuclear device material on the early fireball phenomenon is also studied. It is found that trajectories of the radiation fronts and case shocks change with the opacity of equivalent device *** our simulations, we find that only the early fireball depends on the details of the nuclear device, and after the formation of main shock, the evolution is determined by the properties of hot air for strong atmospheric explosion.
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