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论文类型：期刊论文

发表时间：2015-03-01

发表刊物：JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES

收录刊物：SCIE、EI、Scopus

卷号：34

期号：1

页面范围：218-224

ISSN号：0950-4230

关键字：Large eddy simulation; Methane-air deflagration; Obstacles

摘要：In this paper, large eddy simulation coupled with a turbulent flame speed cloure (TFC) subgrid combustion model has been utilized to simulate premixed methane-air deflagration in a semi-confined chamber with three obstacles mounted inside.
   The computational results are in good agreement with published experimental data, including flame structures, pressure time history and flame speed. The attention is focused on the flame flow field interaction, pressure dynamics, as well as the mechanism of obstacle-induced deflagration. It is found that there is a positive feedback mechanism established between the flame propagation and the flow field. The pressure time history can be divided into four stages and the pseudo-combustion concept is proposed to explain the pressure oscillation phenomenon. The obstacle-induction mechanism includes direct effect and indirect effect, but do not always occur at the same time. (C) 2015 Elsevier Ltd. All rights reserved.