非圆截面云雾爆炸超压场数值模拟  

Simulation of Explosion Overpressure Distribution for Non-circular Cross-section Cloud

作　　者：陈明生[1] 李建平[1] 白春华[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《含能材料》2015年第5期484-489,共6页Chinese Journal of Energetic Materials

基　　金：国家部委预研重点基金项目(9140A05080507)

摘　　要：为研究非圆截面云雾爆炸超压场的分布特性,用LS-DYNA程序对云雾爆炸超压过程进行了数值模拟,将数值模拟超压值与试验超压结果进行了对比,得到了0°、90°、135°和180°共4个方向的峰值超压随距离的变化规律,以及不同起爆高度对超压场分布的影响。结果表明,试验中起爆云雾呈椭球形爆轰火球。4个方向在距离爆炸中心5m处的峰值超压为2.9~5.2MPa。在距离爆炸中心5~50m范围内,地面冲击波轨迹呈椭圆形。冲击波在90°方向的传播速率最小。当起爆高度由0.5m增加至2.5m时,5~15m范围内的地面峰值超压平均提高了8%。To study the distribution characteristics of explosion overpressure field for non-circular cross-section cloud, the numerical simulation of overpressure process of cloud explosion was performed by LS-DYNA program. Comparison between the simulated overpressure values with experimental was carried out. The changing rule of overpressure with distance, as well as of different ignition height on overpressure field distribution was studied at four directions, including 0°, 90°, 135° and 180°. Results show that： ignited cloud shows up as an ellipsoidal detonation fireball in experiment. The peak overpressure value measured at the position of 5 m from explosion center at four directions is from 2.9 MPa to 5.2 MPa. In the range of 5 m to 50 m from explosion center, a shock wave oval trajectory on ground was revealed. Shock wave propagated at 90° direction has lower velocity than others. In the range of 5 m to 15 m, the ground peak overpressure enhances by 8% averagely when ignited height increases from 0.5 m to 2.5 m.

关 键 词：非圆截面 超压 起爆高度 云雾爆炸 数值模拟 

分 类 号：O643.221[理学—物理化学]