Title

A semi-empirical model of spark-ignited turbulent flame growth

Document Type

Conference Proceeding

Publication Date

1-1-2000

Publication Title

SAE Technical Papers

Abstract

A semi-empirical turbulent flame growth model has been developed based on thermodynamic equilibrium calculations and experiments in a 125-mm cubical combustion chamber. It covers the main flame growth period from spark kernel formation until flame wall contact, including the effects of laminar flame speed, root mean square turbulence intensity, turbulent eddy size, and flame size. As expected, the combustion rate increases with increasing laminar flame speed and/or turbulence intensity. The effect of turbulent eddy scale is less obvious. For a given turbulence intensity, smaller scales produce higher instantaneous flame speed. However, turbulence of a smaller scale also decays more rapidly. Thus, for a given laminar flame speed and turbulence intensity at the time of ignition, there is an optimum turbulent eddy size which leads to the fastest combustion rate over the period considered. This optimum eddy size falls in between the more effective, but faster decaying small scale turbulence, and the longer lasting, less effective large scale turbulence which maintains the highest overall turbulence intensity over the combustion period considered. Copyright © 2000 Society of Automotive Engineers, Inc.

DOI

10.4271/2000-01-0201

ISSN

01487191

E-ISSN

26883627

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