非对称云雾爆炸超压场数值模拟

摘要

In order to study the distribution characteristics of overpressure field for non-symmetry detonation,the process of non-symmetry cloud detonation is simulated by LS-DYNA code.The simulated and experimental results are compared.The changing rules of overpressure with distance in three directions,including 0°,90°and 180°,are obtained.The influences of different angles of inclined cloud on overpressure are studied.Results show that there is an angle between cloud and ground.The track of shock wave presents inclined spheroidicity.The attenuation properties of overpressure in different directions are different.The peak overpressure in the direction of 0° is larger than those in other directions,and the peak overpressure in the direction of 180° is the smallest.The attenuation velocity in the direction of 0° is higher than those in other directions,and the attenuation velocity in the direction of 180° is lower than those in other directions.When the angle of inclined cloud increases from 0° to 8.27°,the peak overpressure is decreased by 7％ averagely in the range from 13 m to 30 m in the direction of 0°.The peak overpressure remains nearly unchanged in the direction of 90°,but is increased by 8％ averagely in the range from 13 m to 15 m in the direction of 180°.The peak overpressure is decreased by increasing the angle of inclined cloud.%针对非对称云雾爆炸超压场的分布特性问题,利用LS-DYNA程序对非对称云雾爆炸超压过程进行数值模拟.将数值模拟超压值与空投试验超压结果进行对比,得到了0°、90°和180°共3个方向的峰值超压随距离的变化规律以及不同云雾倾角对超压场分布的影响.研究结果表明:非对称云雾与地面存在一定的倾斜角度,在起爆后地面冲击波轨迹呈现倾斜的椭球形,且各个方向上的超压衰减特性不同,在0°方向冲击波峰值超压较大,且衰减速率最大,在180°方向冲击波峰值超压较低,且衰减速率较小;当云雾倾角由O°增加到8.27°时,传播距离在13 ～30 m范围内的0°方向上,峰值超压平均提高了7％,在90°方向上,超压值基本无变化,而在180°方向上,峰值超压平均降低了8％,因此增加云雾倾角使得峰值超压强度降低.