INVESTIGATION OF FLAME STRETCH IN TURBULENT LIFTED JET FLAME
INVESTIGATION OF FLAME STRETCH IN TURBULENT LIFTED JET FLAME
复制标题
湍流提升射流火焰中火焰拉伸的研究
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Mizobuchi
中科院分区：
文献类型：
--
作者：
S. Ruan;N. Swaminathan;Y. Mizobuchi
对实验室湍流氢射流火焰的DNS数据进行了分析，结果表明，该火焰不仅在火焰底部而且在下游区域都存在混合燃烧。在瞬时结构中观察到的混合模式燃烧在早期的研究和平均结构，其中的主要模式被发现是预混燃烧与变化的当量比。平均结构中的非预混燃烧仅在射流剪切层边缘的狭窄区域内观察到。对火焰拉伸的分析表明，负的火焰拉伸很可能导致负的表面平均火焰拉伸。位移速度曲率的相关性被观察到是负的负火焰拉伸和部分预混导致射流卷吸作用，以减少负相关。湍流应变的火焰拉伸的贡献被观察到是负的标量梯度对齐时，最广泛的主应变率。通过对火焰面密度输运方程的简单分析，讨论了湍流应变引起的负火焰拉伸背后的物理机制。
DNS data of a laboratory-scale turbulent lifted hydrogen jet flame has been analyzed to show that this flame has mixed mode combustion not only at the flame base but also in downstream locations. The mixed mode combustion is observed in instantaneous structures as in earlier studies and in averaged structure, in which the predominant mode is found to be premixed combustion with varying equivalence ratio. The non-premixed combustion in the averaged structure is observed only in a narrow region at the edge of the jet shear layer. The analyzes of flame stretch show large probability for negative flame stretch leading to negative surface averaged flame stretch. The displacement speed-curvature correlation is observed to be negative contributing to the negative flame stretch and partial premixing resulting from jet entrainment acts to reduce the negative correlation. The contribution of turbulent straining to the flame stretch is observed to be negative when the scalar gradient aligns with the most extensive principal strain rate. The physics behind the negative flame stretch resulting from turbulent straining is discussed and elucidated through a simple analysis of the flame surface density transport equation.
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影响因子：
4.4
作者：
Zhaoyu Luo;C. Yoo;E. Richardson;Jacqueline H. Chen;C. Law;T. Lu
通讯作者：
Zhaoyu Luo;C. Yoo;E. Richardson;Jacqueline H. Chen;C. Law;T. Lu
影响因子：
4.6
作者：
N. Chakraborty;N. Swaminathan
通讯作者：
N. Chakraborty;N. Swaminathan
DOI：
10.1007/s10494-010-9250-y
发表时间：
2010-02
期刊：
Flow, Turbulence and Combustion
影响因子：
--
作者：
N. Chakraborty;J. Rogerson;N. Swaminathan
通讯作者：
N. Chakraborty;J. Rogerson;N. Swaminathan
影响因子：
4.6
作者：
Hartung, G.;Hult, J.;Swaminathan, N.
通讯作者：
Swaminathan, N.