点火能对丙烷-空气预混气体爆炸过程及管壁动态响应的影响

在长12 m的无缝不锈钢直管中，通过改变初始点火能量，探究了点火能对封闭管道内丙烷-空气混合气体爆炸传播特性和激波对管壁动态加载的影响。结果表明，初始点火能对预混气体爆炸火焰传播规律以及管壁的动态响应有显著影响：点火能越大，爆炸越剧烈，爆炸压力峰值压力和管壁最大应变就越大，且压力波和管壁应变的发展一致。火焰在传播过程中受到管道末端反射波的作用会发生短暂熄灭和复燃；管壁承受冲击波加载，应变信号主要分布在0~781.25 Hz，管壁最大应变率大于10^-3 s^-1，实验工况下管壁应变属动态响应。

Effect of ignition energy on the explosion process and the dynamic response of propane-air premixed gas

In a 12 m long seamless stainless steel pipe, the influence of ignition energy on the propagation characteristics of propane air mixture in the closed tube and the influence of shock wave on the dynamic loading of the pipe wall are investigated. The results indicate that the dynamic initial ignition energy has a significant impact on explosion flame propagation and wall response of premixed gas. The greater the ignition energy, the greater explosion intensity, explosion pressure peak pressure and maximum wall strain is. And the pressure wave and wall strain development are in good agreement. In the process of flame propagation, the flame will briefly extinguished and happen again by reflection effect from the end of the pipeline. The strain signal is mainly distributed in the frequency range of 0-781.25 Hz and the maximum strain rate of the pipe wall subjected to shock wave loading exceeds 10-3 s-1. So the pipe wall strain belongs to the dynamic response in the experiment.