Abstract
In the present study, detailed numerical models with a one-step finite-rate chemical reaction are employed to investigate the kinetic rate effect (through the variation of the pre-exponential factor) on concurrent flame spread rates. It is found that flames in forced-flow are less sensitive to the change of kinetics than flames in buoyant-flow; and narrow samples are more sensitive to the change of kinetics compared with wide samples. The rate of chemical kinetics affects the flame spread rates through its influence on the flame and the flow structures. For buoyant flames, gravity-induced velocity is affected by the flame temperature which is sensitive to kinetics. Hence the variation of upward spread rate is greater with the rate change of kinetics. This paper presents the details of a systematic investigation and comparison of the flame structures and the influence of gasphase chemical kinetics on several different types of concurrent spreading flames.
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