A priori investigation of subgrid correlation of mixture fraction and progress variable in partially premixed flames
A priori investigation of subgrid correlation of mixture fraction and progress variable in partially premixed flames
复制标题
部分预混火焰中混合分数与进度变量亚网格相关性的先验研究
DOI:
10.1080/13647830.2018.1459862
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发表时间:
2018
影响因子:
1.3
通讯作者:
Chen Z
中科院分区:
文献类型:
--
作者:
Chen Z
Subgrid correlation of mixture fraction,Z, and progress variable,c, is investigated using direct numerical dimulation (DNS) data of a hydrogen lifted jet flame. Joint subgrid behaviour of these two scalars are obtained using a Gaussian-type filter for a broad range of filter sizes. A joint probability density function (JPDF) constructed using single-snapshot DNS data is compared qualitatively with that computed using two independent β-PDFs and acopulamethod. Strong negative correlation observed at different streamwise locations in the flame is captured well by thecopulamethod. The subgrid contribution to theZ–ccorrelation becomes important if the filter is of the size of the laminar flame thickness or larger.A prioriassessment for the filtered reaction rate using the flamelet approach with independent β-PDFs and correlated JPDF is then performed. Comparison with the DNS data shows that both models provide reasonably good results for a range of filter sizes. However, the reaction rate computed usingcopulaJPDF is found to have a better agreement with the DNS data for large filter sizes because the subgridZ–ccorrelation effect is included.
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DOI:
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发表时间:
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期刊:
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