G0601-7-5 High frequency Oscillatory Combustion in a 8-inch Tubular Flame Burner

Abstract

Recently, it was found that the high frequency oscillatory combustion occurred in large size (8 and 12-inch) tubular flame burners under some conditions, and which frequency is in accordance with tangential - radial coupled modes of natural frequency. In this paper, to research the oscillatory combustion in a tubular flame burner, pressure fluctuations in the 8-inch tubular flame burner have been determined at three different locations, at the injection slit, at the axial center of the burner, and at the near of the burner exit. Results showed that pressure fluctuations in the tubular flame burner propagate upstream injection slits, that is, premixture is subject to pressure fluctuation before ejected into the tubular flame burner. Results further indicated that amplitude of pressure fluctuation is the largest at the axial center position of tubular flame burner. Thus, high frequency oscillatory combustion can be considered to predominantly occur at the axial center position of the tubular flame burner.