Effects of Obstacles on Deflagration-to-Detonation Transition in Linked Vessels

order to study the characteristics and rules of deflagration to detonation transition (DDT) in linked vessels, two typical linked vessels were selected in this paper. The research was focused on the effects of pipe length, obstacle number, obstacle position and obstacle blockage ratio on DDT of methane air mixture in linked vessels. The experimental results showed that the pressure peak and the speed of flame propagation were enhanced by the obstacles. The precursory shock waves and the chemical reaction zone were coupled to propagate and caused the occurrence of DDT. When the obstacles were placed in the linked vessels, the distance of DDT occurrence moved forward. Moreover, with the increase of obstacle number, the induced distance of DDT was reduced. The induced distance of DDT was relatively short when the obstacle position was near the location of the explosion vessel.