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Thermo-acoustic instabilities arise when hydrodynamic, acoustic and reactive processes interact to produce disturbance amplification and high levels of sound radiation. In gas turbines, this type of instability is responsible for high NOx emissions, decreased performance and material fatigue. We will present and analyse simple models for the description of thermo-acoustic instabilities. In particular, three cases/geometries will be treated: (1) the Rijke tube, describing the behavior of a ducted flame; (2) the annular combustor, consisting of an acoustically linked ring of Rijke tubes; and (3) the anchored M-flame, a model for gas turbine combustion chambers. In all cases, we are interested in stability characteristics and the extraction of dominant noise-generation processes.
Dr. Peter Schmid, Imperial College - London
Presented April 1, 2016
About the Presenter
About the Presenter
Dr. Peter Schmid is Chair Professor of Applied Mathematics and Mathematical Physics at Imperial College London. He did his undergraduate and graduate studies in aerospace engineering at the Technical University Munich and obtained his doctoral degree in mathematics from the Massachusetts Institute of Technology. His main research interests lie in theoretical and computational fluid mechanics with an emphasis on hydrodynamic stability theory, flow control, model reduction, system identification, and the analysis of a wide range of fluid flows using adjoint sensitivity and optimisation techniques. He is also interested in quantitative flow analysis using data-driven decomposition methods.
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