Thermoacoustics
Thermoacoustic instabilities
Thermoacoustic systems contain multiphysics and encompass multiple scales. Thermoacoustic instabilities occur whenever there is a positive feedback between a source of unsteady heat release and the enclosing acoustic field. Being large amplitude self-sustaining oscillations, thermoacoustic instabilities can easily cause the rocket engines, gas turbines or combustor to vibrate excessively or to even fail. During such instabilities, thermoacoustic systems display a wide variety of asymptotic dynamical behaviour; from steady states to chaotic trajectories. The ability to control the nature and characteristics of thermoacoustic oscillations is therefore a desired capability.
Collaborators:
Relevant Publications:
6. Distributed Time Lag Response Functions for the modelling of Combustion Dynamics, Combustion Theory & Modelling, 19(2), 223-237, 2015.
5. Thermoacoustic instabilities in a ducted premixed flame: reduced order models & control, Combustion Science & Technology, 185(6), 920-942, 2013.
4. Novel Perspectives on the Dynamics of Premixed Flames, Combustion & Flame, 160, 1215-1224, 2013.
3. Subcritical bifurcation and bistability in thermoacoustic systems, Journal of Fluid Mechanics, 715, 210-238, 2013.
2. Non-normality & internal flame dynamics in premixed flame-acoustic interaction, Journal of Fluid Mechanics, 679, 315-342, 2011.
1. Bifurcation analysis of thermoacoustic instability in a Rijke tube, International Journal of Spray & Combustion Dynamics, 2(4), 325-356, 2010.