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RISThe Role of the Centerbody Wake on the Precessing Vortex Core Dynamics of a Swirl Nozzle
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The precessing vortex core (PVC) phenomenon in swirling jets is a helical instability in the flow driven by the coherent precession of the vortex breakdown bubble (VBB) around the flow axis, resulting in the helical rollup ...
Impact of a Centerbody on the Unsteady Flow Dynamics of a Swirl Nozzle: Intermittency of Precessing Vortex Core Oscillations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The precessing vortex core (PVC) is a self-excited flow oscillation state occurring in swirl nozzles. This is caused by the presence of a marginally unstable hydrodynamic helical mode that induces precession of the vortex ...
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 ...
Impact of Hydrogen Addition on the Thermoacoustic Instability and Precessing Vortex Core Dynamics in a CH4/H2/Air Technically Premixed Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We study the impact of H2 enrichment on the unsteady flow dynamics and thermoacoustic instability in the prediction and control of instabilities in industrial turbines (PRECCINSTA) swirl combustor. The experiments were ...