| 摘要: |
| 用代数二阶矩亚网格(ASOM-SGS)燃烧模型对文献中测量的钝体后方丙烷-空气预混燃烧进行了大涡模拟,模拟统计的时平均速度、速度脉动均方根值和温度分布与实验数据结果吻合很好,表明所采用的ASOM-SGS亚网格燃烧模型是合理的。模拟的瞬态结果显现了钝体后方湍流流动和火焰结构。将大涡模拟数据统计得到的反应率系数-浓度关联量的分布规律,与代数二阶矩RANS(ASOM-RANS)燃烧模型的模拟值进行对比,结果发现,大涡模拟统计值和ASOM-RANS模型的模拟值很接近,从而证明了湍流燃烧代数二阶矩RANS模型的合理性。 |
| 关键词: 湍流燃烧 大涡模拟 二阶矩模型+ 火焰 |
| DOI： |
| 分类号:V231.2 |
| 基金项目: |
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| Large-eddy simulation of premixed combustion and validation of the combustion model |
|
WANG Fang1,2, ZHOU Li-xing2, XU Chunxiao2, HUANG Yong1
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1.Coll.of Energy and Power Engineering,Beijing Univ.of Aeronautics and Astronautics,Beijing 100083,China;2.School of Aerospace,Tsinghua Univ.,Beijing 100084,China
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| Abstract: |
| A second-order moment algebraic sub-grid-scale (ASOM-SGS) combustion model is used for large eddy simulation(LES) of propane-air premixed combustion behind a bluff body.The predicted time averaged velocity and temperature,the root mean square(RMS) values of velocity fluctuations are in good agreement with the experimental data,showing the feasibility of the ASOM-SGS combustion model.The instantaneous results show the turbulent flow and flame structures behind the bluff body.The LES statistical results of the reaction rate coefficient-concentration correlation are close to the ASOM-RANS modeling results.So,the closure assumptions made in the ASOM RANS model are validated by large eddy simulation. |
| Key words: Turbulent combustion Large-eddy simulation Second order moment model+ Flame |
