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中文摘要：
采用亚网格动能（k方程）应力模型、二阶矩（SOM）燃烧模型和欧拉拉氏两相流模型,对乙醇-空气液雾燃烧进行了大涡模拟（LES）。瞬态结果显示：在火焰的高温区域,旋涡强度较大;在高温区边缘附近存在的拟序结构有脱落的趋势。在燃烧装置的燃料进口附近,近喷嘴中心区域,大量液滴聚集在条状湍流拟序结构的周围。LES模拟的统计结果给出的温度分布与实验结果吻合较好。说明SOM燃烧模型适用于液雾两相湍流燃烧研究,计算结果经过和实验数据对比发现,LES-SOM燃烧模型优于RANS-PDF及LES-FA计算结果。数值计算结果与实验结果的误差主要是由于采用统观一步反应机理引起的,表明燃烧模型还有待进一步改进。
英文摘要：
In this paper,large-eddy simulation of ethanol spray-air combustion was made by using an Eulerian-Lagrangian approach,a sub-grid-scale kinetic energy stress model,and a filtered finite-rate combustion model with a sub-grid scale reaction rate,called second-order moment（SOM） combustion model,proposed by our research group.The simulation results are validated in detail by experiments. It is found that the LES-SOM statistical results are in better agreement with the experimental results than those obtained by LES accounting for only the filtered finite-reaction rate（LES-FA） neglecting the SGS reaction rate,and are in much better agreement than those obtained by RANS modeling using the most complex PDF equation combustion model with detailed chemistry.The discrepancy maybe caused by shortcomings of a one-step global reaction mechanism.The combustion model remains to be improved.
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