异型防爆墙抗空气冲击波的数值模拟

Numerical Simulation on Different Blast Walls Resisting Air Shock Wave

通过对比广泛认可的空气冲击波计算经验公式,验证了运用动力有限元软件AUTODYN 2D进行数值模拟计算冲击波问题的可行性与准确性;运用AUTODYN 2D计算了4种不同形式防爆墙在相同爆源距时各防爆墙的抗冲击波能力,其次计算了随爆源距的减小各种防爆墙的冲击波超压峰值减弱率均值,并对比分析了其变化趋势,得出4种防爆墙中(b)、(c)、(d)型防爆墙的冲击波超压峰值减弱率均值是随爆源距的减小而递增的,防爆效果较好。

By comparing the widely recognized empirical formula for calculating the air shock wave, it verified the feasibility and accuracy by using dynamic finite element software AUTODYN 2D to simulate the shock wave. The anti-shock wave capability of the four different blast walls with the same distance to the blasting source were calculated firstly. Then the average attenuating rate of peak overpressure of shock wave on every blast wall was calculated following the decrease of distance to blast source and their change trends was also analyzed. The results show that the average attenuating rate of peak overpressure of shock wave of the type of （b） , （c） and （d） blast walls increases with the decrease of distance to blast source, and their anti-explosion effect are better.