多舱室内气云爆炸爆轰产物运动二维数值模拟

A two-dimensional numerical simulation on dynamic motion of detonation products generated by gas cloud explosion inside the multi-cabin

[目的]为了研究多舱室空间内气云爆炸后爆轰产物的运动规律,[方法]采用五阶WENO有限差分格式,通过耦合求解爆轰产物质量分数输运方程与可压缩欧拉方程,自主编写多舱室内气云爆炸过程二维数值计算程序。利用平面激波绕射矩形台阶试验验证本文数值程序的可靠性与正确性。采用验证的程序开展不同爆炸工况气云爆炸过程数值计算,探讨多舱室内爆炸过程中泄压、后燃烧能量加入对爆轰产物运动过程的影响规律。[结果]结果表明:增大泄压口尺寸,可加剧爆轰产物泄出过程;增大反应速率常数,可加速爆轰产物向相邻舱室的扩张过程。[结论]研究成果可为进一步考虑多组分复杂燃烧效应后爆轰产物扩张过程及毁伤评估提供一定的参考和指导。

[Objectives]In order to study on the dynamic motion of detonation products generated by gas cloud explosion inside the multi-cabin,[Methods]the fifth-order WENO finite difference scheme is adopted to solve the coupling of mass fraction transport equation and compressible Euler equation for the detonation products,and then a two-dimensional numerical simulation program for the gas cloud explosion in the multi-cabin is developed successfully.The reliability and correctness of this numerical simulation program is verified by virtue of the plane shock diffraction rectangular step test,after which the verified program is used to carry out the numerical simulation of the gas cloud explosion under different explosion conditions,so as to explore the influence of venting hole and afterburning energy on the dynamic motion process of the detonation products during the explosion inside the multi-cabin.[Results]The results show that increasing the size of the venting hole can accelerate the emission process of the detonation products;increasing the reaction rate constant can accelerate the expansion of the detonation products to the adjacent cabin.[Conclusions]This study can provide a reference and guidance for further exploring the expansion process of the detonation products generated by the complex multi-component combustion and the evaluation of the explosion fireball damage.