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本文运用Frank-Kamenetsky处理非线性反应项的近似法,建立一个油滴着火模型.其结果给出了油滴着火极限的气体相对速度、油滴尺寸以及环境温度之间的函数关系,和文献中实验结果定性一致.该模型可以应用于双模态液雾燃烧的雷诺平均模拟和大涡模拟中.“,”A droplet ignition model is proposed using Frank-Kamenetsky's approximation for treating the nonlinear reaction term.The result gives the droplet ignition limits as functions of the gas relative velocity,droplet size and ambient gas temperature.It is in qualitative agreement with the experimental observation in references.The proposed model can be used in RANS modeling and LES of two-mode spray combustion.