The Numerical Simulation of Diesel Spray Combustion with LES-CMC
The Numerical Simulation of Diesel Spray Combustion with LES-CMC
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DOI：
10.1007/s10494-012-9415-y
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
F. Bottone;A. Kronenburg;D. Gosman;A. Marquis
中科院分区：
文献类型：
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作者：
F. Bottone;A. Kronenburg;D. Gosman;A. Marquis
大涡模拟 (LES) 方法与条件力矩闭合 (CMC) 方法一起用于模拟类似发动机条件下的喷雾燃烧。该策略包括将学术 CMC 代码与商业 CFD 软件 Star-CD (CD-adapco) 相结合。研究了两个问题：首先，传统喷雾模型对 LES 的适用性；其次，LES-CMC 在喷雾燃烧中的适用性。最初开发用于雷诺平均方程的传统喷雾模型已通过进行非反应喷雾计算来评估其在 LES 框架内的适用性。将液芯渗透、喷雾扩散角和气相渗透与现有的实验数据进行了比较，LES 与实验之间的一致性令人满意。已经在一系列初始混合物和温度条件下进行了几次反应喷雾计算，模拟了柴油发动机的配置。计算的自燃时间和火焰升离长度与实验数据吻合良好。尽管喷雾模型和化学成分存在不确定性，但结果表明 LES-CMC 方法可以很好地重现实验结果。
A Large Eddy Simulation (LES) approach together with the Conditional Moment Closure (CMC) method have been used for the simulation of spray combustion in engine-like conditions. The strategy consists of coupling an academic CMC code with the commercial CFD software Star-CD (CD-adapco). Two issues have been investigated: firstly, the applicability of conventional spray models to LES and secondly, LES-CMC for spray combustion. Conventional spray models that were originally developed for use in Reynolds-averaged equations have been assessed for their applicability within the LES framework by conducting non-reacting spray computations. Liquid core penetration, spray spreading angle and vapour phase penetration have been compared to the available experimental data and the agreement between LES and experiments is satisfactory. Several reacting spray calculations have been performed with a range of initial mixture and temperature conditions, which mimic Diesel engine configurations. The computed auto-ignition time and flame lift-off length are in good agreement with the experimental data. Despite the uncertainties associated with the spray models and the chemistry, the results illustrate that the LES-CMC methodology can reproduce well the experimental results.