Extension of a thickened flame model to highly stratified combustion-Application to a spark-ignition engine

被引:8
|
作者
Kazmouz, Samuel J. [1 ,2 ]
Haworth, Daniel C. [1 ]
Lillo, Peter [3 ,4 ]
Sick, Volker [4 ]
机构
[1] Penn State Univ, University Pk, PA 16802 USA
[2] Argonne Natl Lab, 9700 South Cass Ave, Lemont, IL 60439 USA
[3] Exponent Failure Anal Associates, Menlo Pk, CA 94025 USA
[4] Univ Michigan, Ann Arbor, MI 48109 USA
基金
美国国家科学基金会;
关键词
Stratified combustion; Thickened flame model; Dynamic thickened flame model; LARGE-EDDY SIMULATION; PREMIXED TURBULENT COMBUSTION; WRINKLING MODEL; PART II; LES;
D O I
10.1016/j.combustflame.2021.111798
中图分类号
O414.1 [热力学];
学科分类号
摘要
An extension to the dynamic thickened flame model for large-eddy simulations (DTFLES) is presented, which allows modeling highly stratified combustion and accounts for spatial variations of flow and com-bustion metrics. The extension, called the stratified DTFLES (or SDTFLES) relies on a local thermodynamic formulation to calculate combustion parameters that are required for the thickened flame model, more specifically the wrinkling factor El. The advantage of this method is that model parameters are calculated locally without information from outside the computational cell. The extension is developed using user-defined functions in STAR-CD v4.2, and tested first in a baseline parametric study and then in a computa-tional four-valve direct-ignition spark-ignition engine operating in a highly-stratified late-injection mode. The large-eddy simulation (LES) results are compared to experimental results for validation purposes. The comparison covers the spatial variation of combustion parameters, qualitative flame progression, and quantitative in-cylinder pressure, indicated mean-effective pressure (IMEP), and heat release. The model extension is able to reproduce the in-cylinder flame behavior, wrinkling, and burn rate. (c) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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页数:16
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