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基于可实现的k-ε湍流模型、颗粒随机轨道模型、火焰面模型和航空煤油详细化学反应机理对模型燃烧室内两相燃烧流场进行了数值模拟.其中详细反应机理由替代燃油(80%质量分数的正癸烷,20%质量分数的1,2,4-三甲基苯)的反应机理和NOx的反应机理组合而成.通过与实验数据的比较,考察采用该详细化学反应机理的火焰面模型模拟RP-3航空煤油燃烧流场的准确性,特别是污染物排放计算的精度.结果表明:稳态火焰面模型模拟的温度场和CO2生成量与实验数据吻合较好,而预测的NO排放量与实验值偏差较大;非稳态火焰面模型显著提高了NO的预测精度,在工况1(来流马赫数为0.16,进口温度为537 K,油气比为0.004 8,常压)条件下与实验数据吻合较好,但在工况2(来流马赫数为0.155,进口温度为523 K,油气比为0.010,常压)条件下仍过高估计了NO的排放量.
The two-phase combustion flow field in the model combustion chamber was numerically simulated based on the available k-ε turbulence model, the particle random orbit model, the flame surface model and the detailed chemical reaction mechanism of jet fuel. The detailed reaction mechanism consisted of substituting 80% Fraction of n-decane, 20% by mass of 1,2,4-trimethylbenzene) reaction mechanism and the reaction mechanism of NOx by comparing with the experimental data to examine the use of the detailed chemical reaction mechanism of the flame Surface model to simulate the flow field of RP-3 aviation kerosene, especially the accuracy of pollutant emission calculation.The results show that the temperature field and CO2 generation simulated by the steady flame surface model are in good agreement with the experimental data, while the predicted NO emission and experimental values deviate significantly; unsteady flame model significantly improve the prediction accuracy of NO in the condition 1 (Mach Mach number 0.16, the inlet temperature of 537 K, oil gas ratio of 0.004 8, atmospheric pressure ) Is in good agreement with the experimental data. However, the NO emission is still overestimated under condition 2 (Mach 153 flow rate, inlet temperature 523 K, oil-gas ratio 0.010, atmospheric pressure).