为明确高温预混气火焰传播规律,计算了不同初始温度、压力及当量比下氢气/空气、甲烷/空气、乙烯/空气的层流火焰传播速度,分析了层流火焰传播速度随混合气初始状态的变化规律;并结合经验公式给出不同层流燃烧速度下湍流火焰传播速度随脉动速度的分布规律。结果表明:对于轻质碳氢燃料,高温高压条件下,层流火焰传播速度随混合气初始温度增加而增加,随初始压力增大而减小;高温高脉动速度条件下,湍流火焰速度达百米/秒量级。

To obtain a better view on flame speed at high temperature, laminar flame speeds of hydrogen/air, methane/air, ethene/air at different initial temperature, pressure and equivalence ratio were computed and analyzed, and turbulent flame speeds were given at different fluctuating velocity according to empirical model. The results show that laminar flame speed increases while increasing initial temperature or decreasing initial pressure for lightweight carbon-hydrogen fuel, and turbulent flame speed can approach hundreds of meters per second with high velocity fluctuation.