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  • Sheila E. Widnall
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Potential Flow Calculations of Axisymmetric Ducted Wind Turbines

Author(s)
Widnall, Sheila
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Abstract
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.
Date issued
2009-09-02
URI
http://hdl.handle.net/1721.1/46707
Keywords
duct wind trubine potential flow vortex method

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