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航空煤油火蔓延驰豫脉动特性的实验研究
Analysis of Relaxation Oscillations of Aviation Fuel Flame Spreading
【摘要】 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(T0-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T0高于闪点时,脉动频率与(T0-Tc)/Tc呈正比关系,T0低于闪点时,脉动频率与(1+(T0-Tc)/Tc)的0.53次方呈正比关系.
【Abstract】 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 oscil-lation 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.
【Key words】 aviation fuel; flame spreading; flame pulsating; relaxation oscillation;
- 【文献出处】 燃烧科学与技术 ,Journal of Combustion Science and Technology , 编辑部邮箱 ,2011年02期
- 【分类号】V312
- 【被引频次】7
- 【下载频次】163