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
Full text not available from this repository.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, refdoi, ref15 |
| Subjects: | H Engineering > H141 Fluid Mechanics H Engineering > H341 Acoustics H Engineering > H311 Thermodynamics |
| Divisions: | College of Sciences > Faculty of Science > Lincoln School of Engineering |
| Depositing User: | Seong-Ho Jin |
| Date Deposited: | 20 Aug 2011 09:02 |
| Last Modified: | 12 Apr 2013 10:26 |
| URI: | http://eprints.lincoln.ac.uk/id/eprint/4621 |
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