Scalar dissipation and flame surface density in premixed turbulent combustion
- 作者：Kenneth N.C. Bray and Nedunchezhian Swaminathan
- 关键词：Turbulence ; Turbulent premixed flames ; Micro-mixing ; Scalar mixing ; Scalar dissipation rate
Mots-clé ; s ; Turbulence ; Flammes turbulentes de pré ; mé ; lange ; Micro-mé ; lange ; Mé ; lange de scalaire ; Taux de dissipation du s - 刊名：Comptes Rendus Mecanique
- 出版年：2006
- 期刊代码：116_16310721
- 类别：ms
- 出版时间：August-September 2006
- 卷：334
- 期：8-9
- 页码：466-473
- 文件大小：192 K
摘要
A new closed version of the transport equation for the flame surface density in premixed turbulent combustion is derived, on the basis of an equation for the scalar dissipation that has previously been proposed by the present authors. As in this earlier work, volume expansion due to heat release is found to have an important role in determining the flame surface density. An algebraic approximation to the transport equation is obtained, on the basis of an order-of-magnitude analysis, and is found to be in good agreement with data from DNS. Finally, laminar flame calculations are used to estimate a key parameter in the new model. To cite this article: K.N.C. Bray, N. Swaminathan, C. R. Mecanique 334 (2006).