Abstract
Recently, many developments have been made on the tubular flame burner for practical use. However, unexpectedly, it was found that the oscillatory combustion occurred in large size (8 and 12 -inch) tubular flame burners under some conditions. In this paper, to research the oscillatory combustion in a tubular flame burner, pressure fluctuations in the tubular flame burner have been determined, and then, FFT analysis has been made on them. Results have clearly indicated that large amplitude high frequency pressure fluctuations are preceded by intermittent 2400Hz pressure fluctuations. The frequency of 2400 Hz agrees with the natural frequency of (tangential, radial) = (1, 1) mode of 8-inch tubular flame burner. Thus, (tangential, radial) = (1, 1) mode pressure fluctuation can be considered to dominate the large amplitude, high frequency oscillations in tubular flame burners.
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