两相燃烧的大涡模拟

两相燃烧大涡模拟研究正在取得迅速进展.和雷诺平均模拟相比,大涡模拟可以给出流动和火焰的瞬态结构,并且很多情况下可以给出比雷诺平均模拟更准确的统计结果.湍流燃烧大涡模拟的一个关键问题是亚网格模型,特别是燃烧模型.不同研究者提出了或者应用了不同的燃烧模型,但是有的模拟结果缺乏仔细的实验验证,有的统计结果和实验不符合.提出了二阶矩(SOM)燃烧模型,分别成功地用于气体湍流燃烧和液雾燃烧的大涡模拟,显示其优于其他模型.并对近年来气体燃烧、液雾燃烧、煤粉燃烧和油滴燃烧大涡模拟的研究给出了简要的综述.

Large-eddy simulation of two-phase combustion

Large-eddy simulation （LES） of two-phase combustion is under its rapid development. In comparison with the Reynolds-averaged Navier-Stokes modeling （RANS modeling） LES can give instantaneous flow and flame structures and in many cases give more accurate statistical results. One of the key problems in LES is the sub-grid scale （SGS） models, in particular combustion models. Different investigators proposed or used different models. However, some modeling results are lack of detailed experimental validation, or some statistical results are not in agreement with experimental results. A second-order moment （SOM） combustion model was proposed by the present author and his colleagues, and it was successfully used in LES of gas combustion and two-phase combustion, exhibiting its superiority over other models. In this paper a brief review of our systematic studies in LES of gas combustion, spray combustion, coal combustion and droplet combustion is presented.