Nonlinear dynamics of thermoacoustic instability using a kinematic, premixed flame model

Karimi, Nader and Brear, Michael and Jin, Seong-Ho (2004) Nonlinear dynamics of thermoacoustic instability using a kinematic, premixed flame model. In: 15th Australasian Fluid Mechanics Conference, 13-17 December 2004, University of Sydney, Australia.

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Official URL: http://sydney.edu.au/engineering/aeromech/15afmc/p...

Abstract

This paper considers a simple, nonlinear model of a ducted
laminar flame. Ducted flames are susceptible to thermoacoustic instability, in which perturbations in the flame heat release drive acoustic modes of the duct that, in turn, drive the flame perturbations. Both the forced response of the flame and the selfexcited response of system are studied numerically. The overall system demonstrates limit cycles in the heat release, duct velocity
and static pressure. The effect of varying the duct geometry is examined, and the form of the system’s steady state behaviour is found to be strongly dependent on the system’s configuration. This final result infers that the use of a simple saturation element to model the flame non-linearity is inappropriate.

Item Type:Conference or Workshop Item (Presentation)
Additional Information:This paper considers a simple, nonlinear model of a ducted laminar flame. Ducted flames are susceptible to thermoacoustic instability, in which perturbations in the flame heat release drive acoustic modes of the duct that, in turn, drive the flame perturbations. Both the forced response of the flame and the selfexcited response of system are studied numerically. The overall system demonstrates limit cycles in the heat release, duct velocity and static pressure. The effect of varying the duct geometry is examined, and the form of the system’s steady state behaviour is found to be strongly dependent on the system’s configuration. This final result infers that the use of a simple saturation element to model the flame non-linearity is inappropriate.
Keywords:Premixed flame, Thermoacoustic instability
Subjects:H Engineering > H141 Fluid Mechanics
H Engineering > H340 Acoustics and Vibration
Divisions:College of Science > School of Engineering
ID Code:6988
Deposited By: Seong-Ho Jin
Deposited On:30 Nov 2012 09:04
Last Modified:30 Nov 2012 09:04

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