【摘要】 在湍流燃烧中，碳黑的生成会降低火场能见度、增强辐射传热并影响火焰传播，因此，进行湍流燃烧数值模拟研究时，计算火焰中碳黑的生成与分布至关重要。利用概率密度函数(PDF)对基于烟点高度的层流碳黑模型进行湍流修正，将大涡模拟(LES)湍流模型和非预混燃烧模型结合对庚烷和甲苯油池火的碳黑生成与分布进行了预测。结果表明：修正后的湍流模型计算得出的甲苯油池火的碳黑生成预测值与实验值吻合更好；庚烷火焰中的碳黑预测值略低，原因可能是氧化模型碳黑表面积的取值为常数，需进一步修正；模型总体的预测情况良好，表明提出的碳黑生成计算模型基本合理。更多还原

【Abstract】 In turbulent combustion, the formation of soot will reduce the visibility of the fire, enhance the heat radiation and influence flame propagation. Therefore, calculating the formation and distribution of soot in the flame is important in studying numerical simulation of turbulent combustion. The probability density function(PDF) is used to modify the laminar soot model based on smoke point height. The soot formation and distribution of heptane and toluene pool fire are predicted by combining the large eddy simulation(LES) turbulence model with the nonpremixed combustion model. Results show the predicted data of soot formation of toluene pool fire calculated by the modified turbulence model is consistent with the experimental value. However, the predicted soot formation for heptane is low, which may be due to the constant value of soot surface area in oxidation model, which needs to be further modified. The model predicts well, which shows that the proposed soot formation model is reasonable.更多还原