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.