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Title: Some effects of heat release in premixed flames

Abstract

Numerical and experimental results are presented to illustrate some hydrodynamic effects of heat release in premixed flames. The heat release is represented by a simple model which treats the flame front as a two dimensional line source of volume. The velocity and strain rate induced in the flow field are determined and the numerical solution for the case of a laminar double kernel ignition is obtained. Of primary interest is the strain induced in the reactants between the expanding flame kernels and, for heat release rates typical of hydrocarbon flames, the strain rate at the plane of symmetry midway between the kernels up to 150 s{sup {minus}1}. The effects of kernel size, density ratio across the flame front and laminar burning velocity are studied. For the case of turbulent combustion the velocity induced in the reactant stream is measured in a plane parallel to the flame holder of an open premixed turbulent V-shaped flame. A divergent flow field, with a strain rate of 50 s{sup {minus}1}, is induced by the heat release in the flame zone and the consequences of this for determining the turbulent burning velocity in this and similar systems is reviewed.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10148646
Report Number(s):
LBL-35318; CONF-940397-2
ON: DE94011346; TRN: AHC29411%%2
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: Western States section of the Combustion Institute spring meeting,Davis, CA (United States),21-22 Mar 1994; Other Information: PBD: Mar 1994
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; FLAMES; HEAT LOSSES; HYDROCARBONS; COMBUSTION KINETICS; MATHEMATICAL MODELS; TWO-DIMENSIONAL CALCULATIONS; LAMINAR FLOW; TURBULENT FLOW; 400800; COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY

Citation Formats

Shepherd, I.G. Some effects of heat release in premixed flames. United States: N. p., 1994. Web.
Shepherd, I.G. Some effects of heat release in premixed flames. United States.
Shepherd, I.G. Tue . "Some effects of heat release in premixed flames". United States. https://www.osti.gov/servlets/purl/10148646.
@article{osti_10148646,
title = {Some effects of heat release in premixed flames},
author = {Shepherd, I.G.},
abstractNote = {Numerical and experimental results are presented to illustrate some hydrodynamic effects of heat release in premixed flames. The heat release is represented by a simple model which treats the flame front as a two dimensional line source of volume. The velocity and strain rate induced in the flow field are determined and the numerical solution for the case of a laminar double kernel ignition is obtained. Of primary interest is the strain induced in the reactants between the expanding flame kernels and, for heat release rates typical of hydrocarbon flames, the strain rate at the plane of symmetry midway between the kernels up to 150 s{sup {minus}1}. The effects of kernel size, density ratio across the flame front and laminar burning velocity are studied. For the case of turbulent combustion the velocity induced in the reactant stream is measured in a plane parallel to the flame holder of an open premixed turbulent V-shaped flame. A divergent flow field, with a strain rate of 50 s{sup {minus}1}, is induced by the heat release in the flame zone and the consequences of this for determining the turbulent burning velocity in this and similar systems is reviewed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {3}
}

Conference:
Other availability
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