Potential Flow Calculations of Axisymmetric Ducted Wind Turbines
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: th...
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| Format: | Article |
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2009
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| Online Access: | http://hdl.handle.net/1721.1/46707 |
| Summary: | 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. |
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