| Dr Priya Subramanian |
| Fri 05 Oct 2018, 13:00 - 14:00 |
| Alexander Graham Bell (AGB) Building Seminar room |
If you have a question about this talk, please contact: Dong-Hyuk Shin (v1dshin)
Pizza will be served at 12:30.
Abstract:
Thermoacoustic systems consist of a source of unsteady heat release enclosed in an acoustic field, e.g. gas turbines in power plants and aero-engines. Self-sustaining large amplitude oscillatory instabilities arise in such systems due to positive feedback between fluctuations in acoustic pressure and unsteady heat release rate which can lead failure. Here we consider a simple thermoacoustic system consisting of a laminar premixed flame enclosed in a duct that is open at both ends. This talk explores three novel perspectives in modelling the combustion dynamics and their resulting consequences for linear analysis of stability of a thermoacoustic system: (1) the non-orthogonality of the eigenvectors in a premixed flame thermoacoustic system in causing subcritical transition to instability, (2) the use of an impulse response function to identify constitutive physical mechanisms in the response of the laminar premixed flame to acoustic perturbations and (3) modelling combustion dynamics in terms of a distributed time lag response function, which allows for a description that retains rich complexity as opposed to the popular single time lag models.
Bio:
Dr Priya Subramanian earned a PhD at the Indian Institute of Technology, Madras. She was a L’Oréal-UNESCO Women in Science UK fellow in 2017 and is a research fellow at the University of Leeds working to understand the formation of complex patterns in soft matter systems.