Unsteady Combustor Physics

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Thermoacoustic Instability Considerations for High Hydrogen Combustion in Lean Premixed Gas Turbine Combustors: A Review (2021, background): “Constituting one of the most challenging fields of combustion research, thermoacoustic instabilities refer to undesirable, large amplitude oscillations of one or more natural acoustic modes of a combustor arising from resonant interaction between oscillatory flow and unsteady heat release processes ”
Prediction of combustion instability limit cycle oscillations by combining flame describing function simulations with a thermoacoustic network model (2015, background): “According to the linear acoustic theory, all ow and thermodynamic variables can be decomposed into a mean alue and an acoustic perturbation [1,95,96], which is assumed to be mall compared to the corresponding mean value.”
Time domain simulations of nonlinear thermoacoustic behaviour in a simple combustor using a wave-based approach (2015, methodology): “For example, the G-equation model obtains the flame shape by using a kinematic model for the flame position response to oncoming velocity perturbations, and has been studied for various flame shapes: conical, V-shape, M-shape and matrix flames [14,59,34,15,60,35,13,31], with their detailed derivatio”