多点云雾爆炸波相互作用的数值模拟

为研究多点云雾爆炸超压场的分布特性，利用LS-DYNA程序，对4个非圆柱体云雾的爆炸超压的相互作用过程进行了数值模拟，并与实验结果进行了对比。得到了中心区域冲击波相互作用演化过程与中心竖直方向0~20 m处的超压变化规律，以及0°、90°、135°和180°等4个方向的地面峰值超压随水平距离变化的规律。结果表明:中心区域地面依次出现3重冲击波；地面整体超压场强度向中心区域倾斜。在45°方向竖直截面上冲击波波系由入射波、反射波与马赫波构成。

Simulation of blast waves interaction for multiple cloud explosion

In this work, to study the overpressure distribution characteristics for multiple cloud explosion, we carried out a numerical simulation using LS-DYNA of the process of blast waves interaction for four non-circular cross-section clouds, with the computational results verified and compared with experimental data. Furthermore, based on our analysis of the peak overpressure located from 0 m to 20 m in the vertical direction and the processes of blast-waves interaction in the central area, we obtained the variation of the overpressure close to the ground versus the horizontal distances in four directions including 0°, 90°, 135° and 180°. Our results show that three blast waves occur in sequence over the central ground area, and there exists an increasingly higher pressure towards the central area. In the 45° vertical section, blast waves consist of incident wave, reflection wave and Mach wave.