液态碳氢燃料旋转爆震发动机起爆过程试验研究

Experimental Study on Initiation Process of Liquid Hydrocarbon Rotary Detonation Engine

关键词:  旋转爆震发动机  液态碳氢燃料  起爆过程  预爆震管  试验研究

Key words:  Rotary detonation engine  Liquid hydrocarbon fuel  Initiation process  Pre-detonation tube  Experimental study

摘要:

为了分析液态碳氢燃料/纯净空气旋转爆震发动机从点火到旋转爆震波稳定传播过程的影响因素，采用预爆震管点火进行了相关试验研究，获得了预爆震波压力、燃烧室油气比、来流总温、点火器安装方式等对旋转爆震发动机起爆过程的影响。试验结果表明：旋转爆震波起爆时间随着预爆震波压力升高而缩短；来流总温740K，变化当量比时，越接近当量比1，旋转爆震起爆时间越短；工质为当量混气时，来流总温通过影响燃油的蒸发过程进而影响旋转起爆时间，总温673K以上时，起爆时间约10ms；预爆点火器垂直安装比切向安装更快形成旋转爆震波。

Abstract:

To research the characteristics of the initiation process of the rotary detonation wave combustion in liquid hydrocarbon/pure air mixture， an experimental study has been made on a rotary detonation chamber which was ignited by a pre-detonation tube. The factors like the pressure in the pre-detonation tube， the incoming total temperature， equivalence ratio and the mounted style of the igniter have been considered in the experiment. The experimental results show that the rotary detonation initiation time decreases with the rise of the pressure in the pre-detonation tube. The initiation time is shorter as the equivalent ratio of mixture close to 1 when the incoming flow total temperature is 740K. For the stoichiometric mixture， the total temperature influences the evaporation of fuel， so is the initiation process of the rotary detonation wave， the initiation time is 10ms when the total temperature is higher than 673K. It is much more quickly to initiate rotary detonation combustion when the igniter is mounted vertically than tangentially to the chamber wall.