超细水雾雾化方式对甲烷爆炸过程影响的实验研究

通过可视化实验对超细水雾作用下的爆炸过程进行研究,采用两种雾化方式产生超细水雾并借助PDPA实现确定水雾参数下的爆炸影响研究,发现超细水雾将导致爆炸产生增强与抑制两种相反的作用结果;超细水雾通过影响火焰阵面结构间接影响爆炸强度,而超细水雾对火焰阵面的影响程度与水雾参数(水雾粒径、速度和水雾浓度)有关;受超细水雾作用后的火焰分为4种结构,为有效实现爆炸抑制,应使其为小尺度湍流火焰,实现良好的热量交换且不引起明显的火焰面结构变化。同时,压力上升与火焰传播是相对应的,爆炸压力、压力上升速率曲线双峰值和火焰传播速度受水雾参数的影响显著。

Experiment study on effect of methane explosion process by atomization method of ultrafine water mist

Effects of ultrafine water mist on the explosion process were studied by visualization experiments.Two kinds of atomization methods were used to produce the ultrafine water mist and the mist size was measured by PDPA to realize the explosion analysis under certain water mist parameter conditions.It was found that the ultrafine water mist resulted in two opposite effects on methane explosion.The explosion intensity was indirectly affected through the influence of ultrafine water mist on flame front structure.The effect degree of ultrafine water mist on the flame front was related to water mist parameters (i.e.droplet diameter,velocity and spraying concentration).The flame was divided into four kinds of structures after the addition of water mist.In order to effectively realize the explosion suppression,it should make it be a small scale turbulent flame,so it is an advantage to achieve a good heat exchange and not cause obvious changes in the flame structure.The pressure rise is corresponding to the flame propagation.Meanwhile,the effects of mist parameter on the explosion overpressure,the two peak valves of pressure rising rate history and flame propagation velocity were significant.