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Investigations of Thermo-Acoustic Instabilities by Direct Acoustic Admittance Measurements

Published online by Cambridge University Press:  05 May 2011

Tzeng-Yuan Chen  and
Man-Ge Chen
Tzeng-Yuan Chen*
Affiliation:
Department of Aerospace Engineering, Tamkang University, Taipei County, Taiwan 25137, R.O.C.
Man-Ge Chen*
Affiliation:
Department of Aerospace Engineering, Tamkang University, Taipei County, Taiwan 25137, R.O.C.
*
*Associate Professor
**Graduate Research Assistant
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Abstract

This research applied the method of direct acoustic admittance measurement to investigate effects of the flame character and the burner acoustic admittance on the flame-driving behavior. The acoustic admittance data were obtained by directly measuring the amplitudes of pressure and velocity oscillations, and the phase relations between the pressure and velocity oscillations. Results of this research reveal that the flame-driving characteristic is mainly dominated by the nonreactive burner admittance not the flame. Whether the flame is to drive or damp the acoustic field is detcrmined by the acoustic admittance of the burner system. The flame equivalence ratio plays a role mainly in determining the magnitude of the flame driving/damping.

Keywords

Laminar premixed flameAcoustic admittanceCombustion instability
Type
Articles
Information
Journal of Mechanics , Volume 16 , Issue 3 , September 2000 , pp. 133 - 136
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2000

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References

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