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The effects of fluctuation of the fuel flow velocity on the behavior of cylindrical-burner diffusion flame of methane were examined experimentally, with frequency of fuel-flow velocity fluctuation, mean fuel-flow velocity and temperature of ambient air and fuel as experimental parameters. The range of the flame length variation normalized by the flame length without flow fluctuation was found to decrease to zero with increasing the frequency, regardless of the mean fuel-flow velocity. At higher temperatures, flickering of the flame was suppressed even under normal gravity. The effect of the frequency on the flame length at higher temperatures under normal gravity became almost the same as that at room temperature under microgravity.
