EXPERIMENTAL INVESTIGATION ON THE OSCILLATION DYNAMICS OF CANDLE FLAME
An interesting dynamical behavior observed in flame is that under certain circum-stances the flame could oscillate periodically,however the dynamic mechanism behind it was unclear.This paper first conducted an experimental study on the flame oscillation behavior of candles using the schlieren method.It was found that as the flame size increased,the flame first changed from stable combustion to oscillating combustion,and then the oscillation fre-quency of the flame gradually decreased.Through a simplified combustion dynamics model,numerical and theoretical analysis was further conducted on the oscillation behavior of candle flames.It was found that the oscillation frequency of the flame is closely dependent on the fuel supply rate and flame volume.As the fuel supply rate and flame volume increase,the flame first undergoes a Hopf bifurcation and then transitions from stable combustion to oscillatory combustion,then the oscillation frequency of the flame gradually decreased.The theoretical analysis results are qualitatively consistent with the experimental conclusions
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