爆震管内波与火焰相互作用机理的试验

为了解波与火焰相互作用的机理,在60 mm×60 mm×2000 mm方爆震管内,用乙炔(C₂H₂)和空气混合物进行了单爆震性能研究.利用压力传感器与离子探针同时测得爆震管内的压力和火焰传播速度.根据波和火焰触发的不同时刻来分析爆震管内波与火焰相互作用的过程.结果表明:光滑爆震管内没有产生爆震波,压力波始终在火焰前面;加入阻塞比为0.4的扰流器后,爆震管内产生了爆震波.在扰流器内部,爆震波比较复杂,弱压缩波在火焰前面,但火焰在激波前面;在扰流器出口位置以后,激波在火焰前面. 

Experimental study on mechanism of shock-flame interactions in detonation tubes

A series of single detonation experiments were conducted to study the performance of acetylene-air mixtures in square detonation tube.The ion-probes and pressure transducers were utilized to measure the flame velocity and pressure in the tube,respectively.The process of shock-flame interactions was analyzed through different triggering times between ion-probes and pressure transducers.The results indicate that the compression wave occurs always in front of flame without detonation in the smooth tube.With introduction of detonation tube of BR=0.4,detonation occurs in the tube;the flame is in front of shock within the obstacle section,or reversely outside of obstacle section.