Experimental Study on Flame Wander of Small-scale Fire Whirl based on Video Image Analysis

In this work, the flame displacement data along horizontal direction in small-scale fire whirl due to flame wander was extracted by the method of video image analysis, by which the appearance probability of flame center along horizontal direction and frequency of flame wander were calculated, respectively. Linear correlation between frequency data and flame circulation is still achieved in this work, and is compared with that obtained by particle image velocimetry (PIV) method in small-scale fire whirl and that obtained by video image analysis in medium-scale fire whirl in the previous work. The comparisons show that the linear correlation between the frequency of flame wander and flame circulation is independent of flame size, but the linear coefficient of the correlation is related to the flame size. And from the comparison, it can be also found that under the case of the same flame circulation, the frequency of flame wander in small-scale fire whirl is faster than that in medium-scale fire whirl.