Effects of molecular transport in LES/PDF of piloted turbulent dimethyl   ether/air jet flames

doi:10.1016/j.combustflame.2016.11.007

CORC > 北京大学 > 工学院

	Effects of molecular transport in LES/PDF of piloted turbulent dimethyl ether/air jet flames
	You, Jiaping ; Yang, Yue ; Pope, Stephen B.
刊名	COMBUSTION AND FLAME
	2017
关键词	Large-eddy simulation PDF method Dimethyl ether Molecular transport Differential diffusion DENSITY-FUNCTION DIFFERENTIAL DIFFUSION PREMIXED FLAMES REACTIVE FLOWS MIXING MODELS PDF METHODS LES COMBUSTION SCALE AUTOIGNITION
DOI	10.1016/j.combustflame.2016.11.007
英文摘要	We report large-eddy simulation (LES)/probability density function (PDF) modeling of piloted turbulent dimethyl ether (DME)/air jet flames with a skeletal chemical mechanism. The modeled PDF transport equation with three different implementations of molecular transport in the interaction-by-exchange with-the-mean (IEM) mixing model is solved using the NGA/HPDF code in order to assess the a posteriori performance of these LES/PDF methodologies applied to the DME flames D and F proposed in the TNF Workshop. The three implementations considered are the classical random-walk model (IEM-RW), the mean-drift model with a single molecular diffusivity (IEM-MD), and the mean-drift model with differential diffusion (IEM-DD). Better quantitative agreement with experimental data for the mean and root mean-square profiles of mixture fraction, temperature and major species mole fractions and conditional means on mixture fraction are obtained with the IEM-MD model than with the IEM-RW model. In LES of the DME flame series, the molecular diffusivity dominates the turbulent diffusivity in the centerline region, so the accurate modeling of molecular transport plays a significant role in LES/PDF of these jet flames. Nevertheless, the IEM-DD model shows only minor effects on the model predictions compared to IEM-MD in these DME flames. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.; SCI(E); ARTICLE; 451-461; 176
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/475299]
专题	工学院
推荐引用方式 GB/T 7714	You, Jiaping,Yang, Yue,Pope, Stephen B.. Effects of molecular transport in LES/PDF of piloted turbulent dimethyl ether/air jet flames[J]. COMBUSTION AND FLAME,2017.
APA	You, Jiaping,Yang, Yue,&Pope, Stephen B..(2017).Effects of molecular transport in LES/PDF of piloted turbulent dimethyl ether/air jet flames.COMBUSTION AND FLAME.
MLA	You, Jiaping,et al."Effects of molecular transport in LES/PDF of piloted turbulent dimethyl ether/air jet flames".COMBUSTION AND FLAME (2017).