惰性粉尘抑爆过程的实验研究

在长 9m ,内径 0 .1 4m的燃烧管内进行了CaCO3颗粒对H2 O2 混合物中发生爆炸过程的抑制作用的实验研究。该管分为三部分 :激波成长段 ,抑爆段和抑爆后观察段。其中抑爆段装有 1 0套可形成均匀颗粒悬浮流的喷粉系统。实验结果表明 ,仅当颗粒浓度大于某值时 ,才可能有效抑制爆炸 ,否则爆炸波会在抑制后重新成长。笔者还基于两相化学反应流的基本方程 ,通过分裂方法 ,全耦合TVD格式和Lax Wen droff Rubin格式对粉尘抑爆现象进行了数值模拟 ,计算结果反映了惰性颗粒作用下激波的变化过程 ,其结果与实验结果一致

Experimental research on explosion suppression by inert particles

The inert particle suppression of explosion induced in reacting gas mixture has been studied experimentally.The experiments were conducted in a 9m long,0.14m inner diameter tube consisting of three sections:a shock induced section,a suppression section and a post suppression section.A well developed dust dispersion system was equipped on the suppression section to get a good quality uniform particle suspension for the explosion suppression.The shock waves and flame fronts were measured by pressure transducers and photodiodes respectively.It has been shown from experimental results that only if the dust concentration is larger than a critical value,the explosion will be quenched completely,otherwise it may get strong again in the post suppression section.A numerical technique has been developed to integrate the governing equations based on a non steady tow phase reacting flow with the existence of the very disparate time scales and spatial length scale,as well as the appearance of shock waves.The conclusions got from calculations are consistent with that from experi~ments.