期刊
COMBUSTION AND FLAME
卷 161, 期 10, 页码 2627-2646出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2014.04.010
关键词
Turbulent combustion; Stratified combustion; Co-annular jet burner; Large eddy simulation; Tabulated chemistry; Cambridge stratified burner
类别
资金
- state of Nordrhein-Westfalen, Germany
Detailed comparisons of LES results against measurement data are presented for the turbulent lean and rich stratified Cambridge flame series. The co-annular methane/air burner with a central bluff body for flame stabilization has been investigated experimentally by Sweeney et al. [1,2]. Three cases with varying levels of stratification in the lean and rich combustion regime are taken into account. Turbulent combustion is modeled by using the artificial thickened flame (ATF) approach in combination with flamelet generated manifolds (FGM) lookup tables. The model is adapted for stratified combustion and an alternative formulation for the flame sensor is presented. Three different grids are used to investigate the influence of the filter width and the sub-filter modeling on the overall results. Velocities, temperatures, equivalence ratios, and major species mass fractions predictions are compared with measurements for three different stratification rates and an overall good overall agreement was found between simulation and experiment. Some deviations occur near the bluff body, which are analyzed further by evaluation of atomic and species mass fractions. The stratified combustion process was further investigated and characterized by probability density functions extracted from the simulation results. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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