Linear and non-linear forced response of a conical, ducted, laminar premixed flame

Karimi, Nader and Brear, Michael and Jin, Seong-Ho and Monty, Jason (2009) Linear and non-linear forced response of a conical, ducted, laminar premixed flame. Combustion and Flame, 156 (11). pp. 2201-2212. ISSN 0010-2180

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Full text URL: http://dx.doi.org/10.1016/j.combustflame.2009.06.0...

Abstract

This paper presents an experimental study on the dynamics of a ducted, conical, laminar premixed flame subjected to acoustic excitation of varying amplitudes. The flame transfer function is measured over a range of forcing frequencies and equivalence ratios. In keeping with previous works, the measured flame transfer function is in good agreement with that predicted by linear kinematic theory at low amplitudes of acoustic velocity excitation. However, a systematic departure from linear behaviour is observed as the amplitude of the velocity forcing upstream of the flame increases. This non-linearity is mostly in the
phase of the transfer function and manifests itself as a roughly constant phase at high forcing amplitude.
Nonetheless, as predicted by non-linear kinematic arguments, the response always remains close to linear
at low forcing frequencies, regardless of the forcing amplitude. The origin of this phase behaviour is then sought through optical data post-processing.

Item Type:Article
Additional Information:This paper presents an experimental study on the dynamics of a ducted, conical, laminar premixed flame subjected to acoustic excitation of varying amplitudes. The flame transfer function is measured over a range of forcing frequencies and equivalence ratios. In keeping with previous works, the measured flame transfer function is in good agreement with that predicted by linear kinematic theory at low amplitudes of acoustic velocity excitation. However, a systematic departure from linear behaviour is observed as the amplitude of the velocity forcing upstream of the flame increases. This non-linearity is mostly in the phase of the transfer function and manifests itself as a roughly constant phase at high forcing amplitude. Nonetheless, as predicted by non-linear kinematic arguments, the response always remains close to linear at low forcing frequencies, regardless of the forcing amplitude. The origin of this phase behaviour is then sought through optical data post-processing.
Keywords:Laminar premixed flame, Flame transfer function, Non-linearity, Thermoacoustics
Subjects:H Engineering > H141 Fluid Mechanics
H Engineering > H341 Acoustics
H Engineering > H311 Thermodynamics
Divisions:College of Science > School of Engineering
ID Code:4621
Deposited By: Seong-Ho Jin
Deposited On:20 Aug 2011 09:02
Last Modified:02 Sep 2014 09:13

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