Self-excited combustion oscillations of a burner: cause and remedy

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Conference10th International Congress on Sound and Vibration: 07 July 2003, Stockholm, Sweden
Pages18; # of pages: 8
Subjectnoise, combustion, acoustic modeling; Combustion
AbstractThe burner, a piece of ?cooking equipment?, operates in a wide range of power outputs. Contrary to expectations, it generated a much higher level of noise at lower power outputs than at higher power outputs. At lower power outputs, a fluctuating flame regime existed both inside the combustion chamber and the pre-heating chamber, which did not occur at higher power outputs. Using detailed noise measurements and spectral analysis plus acoustic modeling, the problem was identified as a self-excited combustion oscillations (SECO). Therefore, the remedy was to decouple the acoustic pressure and the unsteady heat release through design modifications. This posed a challenging task. This paper presents our understanding of the SECO in terms of noise spectra, dominant acoustic resonance frequencies and the corresponding acoustic pressure mode shapes by means of this burner. More specially, an effective remedy technique is proposed and its successful application to suppressing the SECO of this burner is demonstrated and analyzed.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46628
NPARC number20378877
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Record identifier4fcd7321-1ded-4aa9-975c-226d99884821
Record created2012-07-24
Record modified2016-05-09
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