低空强爆炸中火球的一维数值模拟研究

摘要

对海平面环境下当量为1 Mt TNT的强爆炸进行一维辐射流体力学数值计算，得到了较为完整的火球扩张过程数值模拟结果。数值给出了火球不同发展阶段物质参数和辐射参数的空间分布，该结果与实际强爆炸中一些经验公式的计算结果吻合较好。给出了火球阵面和辐射功率随时间的变化关系，较合理地解释了低空强爆炸火球二次极大现象。%A one‐dimensional radiation hydrodynamics numerical computation was pres‐ented for a strong explosion at sea level ,of which the equivalent is 1 Mt TNT .The spatial distributions of material and radiation parameters in strong explosion , w hich reflect a integrate process of fireball evolution ,were given in terms of the simulation . The calculation results agree well with those of some empirical formulas .The results of optical observables‐radiation power versus time and fireball radius versus time were de‐scribed ,and the second maximum phenomenon of the fireball at low altitude was given .