可控活化热氛围下喷射燃料自燃的研究方法

阐述了湍流反应流中自燃的研究方法及现状,对可控活化热氛围下的气体燃料及液体燃料的自燃现象分别开展了试验研究,提出了一个研究液体燃料均质混合气自燃的新方式。结果表明:甲烷气体燃料火焰起升高度随协流温度的升高而降低,呈现出两阶段变化特点,低温段发生了明显的自燃现象,其火焰稳定由均质混合气自燃所主导;柴油液雾燃烧试验观察到了快速的多点自燃现象,形成了独特的起升火焰,有三重火焰的特征。试验结果验证了所提出的研究液体燃料自燃方法的可行性。

Research Method for Autoignition of Fuel Jet in Controllable Active Thermo-atmosphere

The research methods of the autoignition in the turbulent reacting flow and their state-of-the-arts were reviewed.The autoignition phenomena of gaseous fuels as well as liquid fuels in a controllable active thermo-atmosphere(CATA) were investigated experimentally.A novel research method for the autoignition of homogeneous mixture of the liquid fuel was proposed.The results show that the lift-off height of the CH_4/Air jet flame decreases with the increase of the co-flow temperature,and the change of the lift-off height versus the co-flow temperature presents the two-stages behavior,and the stabilization of lifted flame is dominated by the autoignition of premixed homogeneous mixture in lower co-flow temperature range.The phenomena of rapid multipoint autoignition were observed in the experiment of diesel fuel spray issuing into the CATA,and a special lifted flame appeared with a triple flame.The results prove the feasibility of the proposed method for the research of liquid fuel autoignition.