炸药驱动式爆炸管的载荷计算

目的 建立管道内冲击波参数工程预示方法,指导炸药驱动式爆炸管载荷设计和试验调试.方法 建立炸药爆炸的多介质流动数值模型,研究圆形管道内冲击波的传播规律,给出冲击波参数与炸药量、传播距离之间的变化关系,基于已有的坑道内冲击波超压预示公式,建立表征模型.结果 冲击波在管道中经过一定距离的传播后,会逐渐形成平面冲击波.随着传播距离的增加,平面冲击波的超压峰值逐渐降低,正压持续时间逐渐增大.增大炸药量可以在相同距离下获得更高超压峰值的平面冲击波,已有坑道冲击波超压预示公式同样适用于圆形管道.结论 该冲击波参数预示模型可应用于爆炸激波管载荷设计和试验调试.

Simulation on the Blast Load Inside the Explosively Drived Shock Tube

The paper aims to establish the engineering prediction method and guide the blast load design of the explosive test among the pipe. The multi-phase flow numerical model of explosion was constructed, and the propagation of shock wave was studied in the pipe. The relationship between shock wave parameters, quantity of explosion and propagation distance was given. The characteristic model of shock wave parameter was established based on the existing prediction equation. The plane shock wave was gradually generated after the propagation for a certain distance along the pipeline. With the increase of the propagation distance, the peak overpressure of the plane wave gradually decreased and the duration of positive pressure increased. The plane shock wave with higher peak overpressure could be obtained at the same distance by increasing the amount of explosion. The existing prediction model was also suitable for the current circle tube. The presented prediction method of shock wave parameters can be applied to guide the load design and test debugging of explosion in the shock tube.