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Numerical study on fractal-like soot aggregate dynamics of turbulent ethylene-oxygen flame

机译：湍流乙烯-氧气火焰的分形烟灰聚集体动力学数值研究

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摘要

The soot aggregate dynamics of turbulent ethylene-oxygen flame is numerically studied for different equivalence ratios and jet Reynolds numbers (Re-j). Our developed Taylor-series expansion method of moments (TEMOM) model in our previous research studies is further extended to solve the bivariate population balance equation (PBE) and formulate the novel Bivariate TEMOM model scheme. Full numerical validations are performed with the stochastically weighted operator splitting Monte Carlo method and moving sectional method, the Bivariate TEMOM model scheme coupled with large eddy simulation (LES) method and soot formation model is used to simulate fractal-like soot aggregate dynamics in turbulent ethylene-oxygen flame. The results show that soot nucleation and surface growth processes are enhanced with increasing equivalence ratio while the coagulation rate is hardly varied as the total soot volume fraction is quite low. The increasingly uniform distributions of fractal dimension and particle size can also be observed. As Re increases from 14,400 to 36,000, both the mean diameter and mean fractal dimension of soot aggregates gradually decrease as the surface growth rates of soot aggregates decrease significantly. However, the effect of increasing Re, on coagulation and nucleation rates are slight due to the decreasing residence time of soot particles in the combustor.
机译：对不同当量比和射流雷诺数（Re-j）数值研究了湍流乙烯-氧气火焰的烟尘聚集体动力学。在先前的研究中，我们开发的泰勒矩矩展开法（TEMOM）模型得到了进一步扩展，以求解双变量总体平衡方程（PBE）并制定了新颖的双变量TEMOM模型方案。使用随机加权算子分裂蒙特卡洛方法和移动截面方法进行完整的数值验证，将双变量TEMOM模型方案与大涡模拟（LES）方法结合，并使用烟灰形成模型来模拟湍流乙烯中的分形烟灰聚集体动力学。 -氧气火焰。结果表明，随着总当量比的增加，烟灰的形核和表面生长过程得到增强，而总烟灰体积分数非常低，因此凝固速率几乎不变。分形尺寸和粒度的日益均匀的分布也可以观察到。当Re从14,400增加到36,000时，烟灰团聚体的平均直径和平均分形维数会随着烟灰团聚体的表面生长速率显着降低而逐渐降低。但是，由于烟灰颗粒在燃烧室中停留时间的减少，增加Re对凝结和成核速率的影响很小。

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