More on global quenching of premixed Ch 4/diluent/air flames by intense near-isotropic turbulence

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Title:	More on global quenching of premixed Ch 4/diluent/air flames by intense near-isotropic turbulence
Authors:	施聖洋;Liu, C. C.;Shy, S. S.;Dong, Y. C.;Peng, M. W.
Contributors:	工學院機械工程學系
Keywords:	Equivalence ratio;Flame global quench;Ignition transition;Reaction zone P�clet number;Turbulent Karlovitz number;Turbulent premixed combustion
Date:	2012-10-01
Issue Date:	2026-04-23 15:18:20 (UTC+8)
Publisher:	Taylor and Francis Ltd.;Taylor & Francis Group
Abstract:	摘要： In 2002, Yang and Shy reported a global quenching (GQ) criterion of premixed CH 4 flames by turbulence characterized by a Karlovitz number (Ka) estimated at reactant temperature and an equivalence ratio (φ).This article re-analyzes such criteria based on a modified Ka estimated at mean temperature of reactants and products together with newly obtained GQ data at even higher Ka. This modified criterion is compared with a recently found ignition transition, which are then used to evaluate the boundary of thin and broken RZ regimes (Ka = 100) proposed by Peters ( 2000 ). It is found that flame GQ occurs beyond the broken RZ regime, where critical Ka ≥ 100 at 0.6 ≤φ < 1.3 forms a parabolic curve with the maximum Ka c ≈ 365 occurring possibly near φ = 1, except for very rich flames where Ka c = 28 at φ = 1.45. A simple model is proposed to explain these results. 出版者： Taylor & Francis Group 出版日期： 2012-10-01 出處： Combustion science and technology, 2012-10, Vol.184 (10-11), p.1916-1933 版權： Copyright Taylor & Francis Group, LLC 2012 識別號： ISSN: 0010-2202 識別號： EISSN: 1563-521X 識別號： DOI: 10.1080/00102202.2012.690658
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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