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通过“湍流涡团尺度”与“边界层反应尺度”的关联,建立了湍流煤粉火焰中多相燃烧的跨尺度模拟方法。该方法能够预报湍流脉动宏观规律对静止颗粒边界层内气相反应(如挥发分火焰、CO火焰)的影响。将该方法用于煤粉旋流燃烧数值模拟中,结果显示:与完全忽略边界层气相反应的单膜模型相比,跨尺度模拟的预报结果与Lockwood实验数据有更好的符合。
By means of the correlation between the scale of turbulent eddies and the scale of boundary layer reaction, a multi-scale simulation method for multi-phase combustion in turbulent pulverized coal flames was established. This method can predict the influence of macroscopic turbulence laws on the gas phase reaction (such as volatile flame and CO flame) in the stationary particle boundary layer. The method was applied to the numerical simulation of pulverized coal swirling combustion. The results show that the prediction of cross-scale simulation is in good agreement with the experimental data of Lockwood compared with the single-membrane model ignoring the boundary layer gas-phase reaction completely.