LES of the Cambridge Stratified Swirl Burner using a Sub-grid pdf Approach
LES of the Cambridge Stratified Swirl Burner using a Sub-grid pdf Approach
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DOI：
10.1007/s10494-016-9719-4
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发表时间：
2016-06-01
影响因子：
2.4
通讯作者：
Marquis, A. J.
中科院分区：
文献类型：
--
作者：
Brauner, T.;Jones, W. P.;Marquis, A. J.
重新排列了次网格尺度概率密度函数方程，以便将分辨的和次网格尺度（sgs）对sgs混合项的贡献分开。这允许建模，是符合可忽略的次网格尺度变化的限制情况下，实验室预混火焰的应用程序所需的属性。新方法应用于剑桥分层旋流燃烧器的6个工况，2个等温和4个燃烧，不同程度的旋流和混合物分层。的模拟进行大涡模拟（LES）代码BOFFIN，其中建模的PDF传输方程使用欧拉随机场方法求解。八个随机场被用来考虑亚网格波动的影响和化学建模与减少版本的GRI 3.0机制甲烷涉及19个物种和15个反应步骤。模拟的等温和燃烧的情况下的速度与实验数据显示出良好的一致性。测量的温度和主要物种的配置文件也复制到一个很好的精度。
The sub-grid scale probability density function equation is rearranged in order to separate the resolved and sub-grid-scale (sgs) contributions to the sgs mixing term. This allows modelling that is consistent with the limiting case of negligible sub-grid scale variations, a property required for applications to laboratory premixed flames. The new method is applied to the Cambridge Stratified Swirl Burner for 6 operating conditions, 2 isothermal and 4 burning, with varying degrees of swirl and mixture stratification. The simulations are performed with the Large Eddy Simulation (LES) code BOFFIN in which the modelled pdf transport equation is solved using the Eulerian stochastic field method. Eight stochastic fields are used to account for the influence of the sub-grid fluctuations and the chemistry is modelled with a reduced version of the GRI 3.0 mechanism for methane involving 19 species and 15 reaction steps. The simulated velocities for both the isothermal and burning cases show good agreement with the experimental data. The measured temperature and major species profiles are also reproduced to a good accuracy.