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A Semi-Empirical Model of Spark-Ignited Turbulent Flame Growth
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 06, 2000 by SAE International in United States
Annotation ability available
Event: SAE 2000 World Congress
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.
CitationMann, K., Ting, D., and Henshaw, P., "A Semi-Empirical Model of Spark-Ignited Turbulent Flame Growth," SAE Technical Paper 2000-01-0201, 2000, https://doi.org/10.4271/2000-01-0201.
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