燃气爆炸冲击加载试验研究与数值模拟

摘要

Based on a large nuclear explosion simulator-gas blast shock (GBS)loading system,acetylene-air flammable gas explosion tests were performed .The feasibility was explored by using acetylene-air gaseous mixture as an explosive source to perform anti-explosion tests of structures.Through analyzing the blast pressure time-history curves,the blast loading laws on structures under gas explosion were studied.The propagation processes of gas explosion shock wave were simulated using the finite element program LS-DYNA.The numerical simulation results are compared with the test ones,and the simulation results of peak pressure agree well with the test ones.The results showed that the explosion shock wave pressure is the biggest when acetylene concentration reaches 9.45%;the positive reflection overpressure peak value on the inner wall of the large nuclear explosion simulator can reach 0.815 MPa.The results provided a basis for explosion shock loading controls.%利用大型核爆炸模爆器—燃气爆炸冲击加载试验装置进行乙炔－空气可燃气体爆炸试验研究，探索乙炔－空气可燃气体作为爆炸源对结构抗爆试验的可行性。通过分析压力时程曲线，研究气体爆炸对结构的冲击荷载规律。采用有限元程序 LS-DYNA 模拟气体爆炸冲击波传播过程。结果表明，峰值压力数值计算与试验结果吻合较好；乙炔浓度达9．45％时爆炸冲击波压力最大，在模爆器内壁产生的正反射波压力高达0．815 MPa。研究结果可为此类试验加载控制奠定基础。