https://hdl.handle.net/1721.1/46703 2026-04-04T17:46:23Z https://hdl.handle.net/1721.1/88109 Augmentation of Power Output of Axisymmetric Ducted Wind Turbines by Porous Trailing Edge Disks widnall, sheila; byron, james; florin, peter This paper presents analytical and experimental results that demonstrated that the power output from a ducted wind turbine can be dramatically increased by the addition of a trailing edge device such as a porous disk. In addition, the trailing edge device can be designed to be geometrically adaptable, allowing the turbine to spin up at low wind speeds and providing relief from aerodynamic loads at high wind speeds. 2014-06-30T00:00:00Z https://hdl.handle.net/1721.1/46707 Potential Flow Calculations of Axisymmetric Ducted Wind Turbines Widnall, Sheila An incompressible potential-flow vortex method has been constructed to analyze the flow field of a ducted wind turbine following that outlined by Lewis (1991). Attention is paid to balancing the momentum change in the flow to the total longitudinal forces acting on the duct-turbine combination: the pressure force on the actuator disk plus the pressure forces acting on the duct, which typically includes a negative component of drag due to high leading-edge suction. These forces are shown to balance the momentum changes in the flow, resulting in a model for power output from a ducted wind turbine over a wide range of pressure changes across the actuator disk. The results are compared to the Betz actuator disk model and it is shown that the maximum power output from a ducted turbine occurs at a lower value of pressure drop/momentum extraction than that for a bare turbine. 2009-09-02T18:05:53Z