Abstract: Thermoacoustic instability is a serious problem encountered during the development of practical combustion systems such as gas turbine combustors, ramjet engines, rocket motors, burners, furnaces etc. It is manifested in the form of large amplitude pressure oscillations. These oscillations induce structural vibrations which are highly detrimental to the system. This instability occurs due to the feedback between the unsteady heat release and the acoustic oscillations in a system. In this talk, I will present theoretical and experimental investigations of the non-normal and nonlinear nature of thermoacoustic interactions. The role of non-normality in subcritical transition to instability (known as triggering instability in the thermoacoustics community) will be examined. The multiscale and multiphysics aspects of thermoacoustic instabilities will also be discussed.

The lecture can be attended without previous notice.