不同端面密封条件下缓燃-爆震转捩特性试验

为研究不同端面封闭程度时缓燃-爆震转捩(DDT)的特性,在60mm×60mm×2000mm方爆震管内,在封闭端设置了5种阻塞比的方孔,针对4种余气系数用乙炔(C2H2)和空气混合物进行了单爆震性能研究.利用安装在同一截面上的压力传感器与离子探针同时测得缓燃向缓燃-爆震转捩(DDT)转捩位置处爆震管内的压力、火焰传播速度和方向.分析结果表明:①随端面阻塞比的增大,DDT的距离会变长;②端面的封闭程度并不影响DDT转捩的本质特性.

Experimental study on characteristic of deflagration to detonation transition in different close end

In order to investigate the characteristic of deflagration to detonation transition(DDT) in close end with 5 kinds of block ratios,a series of single detonation experiments were conducted to study the performance of acetylene-air mixtures in square detonation tube of 60 mm×60 mm×2 000 mm.The ion-probes and pressure transducers were utilized to get the velocity and pressure in the tube,respectively.The results indicate:(1) Position of DDT moves back with the accretion of block ratio in close end;(2) The block degree does not affect essential characteristic of DDT.