射流点火对爆震管中爆燃转爆震影响的实验

Experimental investigation on effects of flame jet ignition on deflagration to detonation transition in tube

采用射流火焰的点火方式进行了爆震管中乙炔和空气混合物从爆燃向爆震转捩的实验研究.爆震管一端开口一端封闭,在封闭端与爆震管垂直安装预燃室,采用火花塞在预燃室中点火,形成射流火焰引燃爆震管中的混合物.基于光电转换原理研制的火焰测速系统测量了爆震管中火焰传播速度.实验表明,与在爆震管壁面火花塞点火相比,射流火焰点火加大了爆震管中初始火焰速度,减小了火焰从爆燃向爆震转捩的距离.通过对不同实验条件下爆燃转爆震过程的分析,探讨了射流火焰点火方式减小火焰从爆燃向爆震转捩距离的机理.

A detonative tube filled with acetylene and air by flame jet ignition was designed to study deflagration to detonation transition.The detonative tube was one end opened and the other end closed.A pre-combustion chamber was installed at the closed end perpendicularly to detonative tube.Flame jet produced by spark plug ignition in pre-combustion ignited the mixture in detonative tube.Flame propagation velocity in duct was measured by a system based on photoelectric transition principle.Compared with spark plug ignition in tube wall,flame jet ignition can increase initial velocity in the tube and reduce the distance of deflagration to detonation transition.Through the experiments of the deflagration to detonation transition process in different experimental conditions,the mechanism that flame jet ignition can reduce the distance of deflagration to detonation transition was discussed