液体燃料脉冲爆震发动机点火方法研究

Ignition method for liquid-fueled pulse detonation engine

目前脉冲爆震发动机的起爆主要采用爆燃向爆震转变的方式实现,而爆燃波发展缓慢,消耗了循环周期的很长一段时间。为缩短爆燃向爆震转变的时间和距离,本文研究了一种新型蒸发管点火系统,用蒸发管对两相混合物进行预蒸发,在预燃室内点火形成火焰射流进入主爆震室,实现主爆震室内两相混合物的快速短距离起爆。热态实验在内径120mm,长2500mm的爆震室上进行。与火花塞直接在主爆震室点火相比起爆时间可以从12.5ms缩短到2～3ms,起爆距离可以从1350mm缩短到775mm。预燃室长度和个数对起爆过程也具有非常明显的影响,长度和个数的增加都有利于爆震波的起爆。

Ignition method based on turbulent hot jet is developed for two-phase pulse detonation engine (PDE). It is used to enhance a deflagration to detonation transition (DDT) time and distance. The turbulent hot jet is created by combustion in a pre-combustor which has a spark plug and a vaporizing tube. The vaporizing tube breathes and vaporizes two-phase mixture from main combustor to form combustible mixture, which is ignited by the spark to produce transverse hot turbulent jet into main combustor. In order to...