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Absolute/Convective Instability Transition in a Backward Facing Step Combustor: Fundamental Mechanism and Influence of Density Gradient
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Hydrodynamic instabilities of the flow field in lean premixed gas turbine combustors can generate velocity perturbations that wrinkle and distort the flame sheet over length scales that are smaller than the flame length. ...
Effects of Fuel Staging on the Hydrodynamic Stability of Multinozzle Swirl Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Hydrodynamic instability in lean premixed gas turbine combustors can cause coherent flow velocity oscillations. These can in turn drive heat release oscillations that when favorably coupled with combustor acoustic modes ...
Influence of Nonaxisymmetric Confinement on the Hydrodynamic Stability of Multinozzle Swirl Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Interaction between coherent flow oscillations and the premixed flame sheet in combustors can result in coherent unsteadiness in the global heat release response. These coherent flow oscillations can either be self-excited ...
Impact of Precessing Vortex Core Dynamics on Shear Layer Response in a Swirling Jet
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Combustion instability, the coupling between flame heat release rate oscillations and combustor acoustics, is a significant issue in the operation of gas turbine combustors. This coupling is often driven by oscillations ...