航空煤油火蔓延驰豫脉动特性的实验研究

摘要

Oscillation form , spreading velocity , oscillation frequency and amplitude of aviation fuel flame spreading were analyzed. When fuel temperature increased within the critical value , the spreading velocity and oscillation frequency of main flame and the oscilation amplitude of flash flame increased. Semi-empirical models were also developed to predict flame spreading velocity and oscillation frequency under different fuel temperature.%针对液相控制条件下航空煤油火焰蔓延的驰豫脉动特性,借助CCD摄像和幅频分析技术,对航空煤油火蔓延速度、驰豫脉动模式、脉动频率和脉动幅值等特性进行了实验研究.对航空煤油火焰驰豫脉动蔓延产生机理进行了分析,分析结果表明,在液相控制条件下,前展-回缩-前展-回缩是航空煤油火焰驰豫脉动的主要模式,火焰蔓延平均速度与(To-Tc)/Tc的2.16次方呈正比关系.主火焰蔓延脉动频率和闪火焰脉动幅值随燃料初始温度升高而增大,初始温度To高于闪点时,脉动频率与(To-Tc)/Tc呈正比关系,To低于闪点时,脉动频率与(1+(To-Tc)/Tc)的0.53次方呈正比关系.