Abstract
Effects of operating conditions of a CFR engine on variations of flame travel time were studied statistically. Cyclic variations of falme travel time showed some departure form a normal distribution, but those of the "apparent flame propagation velocity", the distance of flame travel divided by the flame travel time, were shown to follow a normal one in general.The mean apparent flame propagation velocity υ^-f was found to have linear correlation with the standard deviation σ. It was shown also that υ^-f/SL (SL : laminar burning velocity) was directly proportional to σ/SL in all the results obtained at different inlet mixture temperatures, and to Harrow's Reynolds number of the mixture before combustion over a wide range.An explanation for actual pattern of cyclic distribution of flame travel was made by incorporating the effects of cyclic variation of mixture stregth and the flame velocity due to the turbulence in the combustion chamber.
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