L8-+Fall+2011

L8-+Fall+2011 - MAE 14:650:474 Alternative Energy Systems...

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Unformatted text preview: MAE 14:650:474 Alternative Energy Systems Lecture 8: Class Agenda o Wind Energy 1 MAE 14:650:474 Alternative Energy Systems Wind Energy o Has experienced the most rapid growth over the last few years. o Are generally categorized as : 2 o Designation depends on the axis of rotation: o HAWTs are more common than VAWTs o HAWTS typically have yaw control to keep them pointed in the direction of the wind , How power is extracted from blades o MAE 14:650:474 Alternative Energy Systems 3 How power is extracted from blades o same as airplane wings - airfoils o line A-A is an arbitrary reference plane o can have symmetric and asymmetric airfoils MAE 14:650:474 Alternative Energy Systems 4 o when air flows along x-axis force is exerted on the foil o Wind Turbine Configurations o several wind turbine configurations have been proposed s MAE 14:650:474 Alternative Energy Systems 5 o Wind Turbine Configurations o Drag-type wind turbines s MAE 14:650:474 Alternative Energy Systems 6 o Persian wind turbine (drag type) s two walls channel the wind forcing it to blow on only one side of device (creating torque) s one wall forms a funnel concentrating the collected wind wind Wind Turbine Configurations o bucket wind turbine (vertical wind axis) s rotates because convex surface offers less wind drag than the concave one MAE 14:650:474 Alternative Energy Systems 7 o Savonius s use staggered buckets with gap between them s air is accelerated as it passes the gap reducing the front drag of the convex bucket s this air is then blown on the reverse side of the bucket s not as efficient as lift devices Wind Turbine Configurations o Lift-Type Wind Turbine s MAE 14:650:474 Alternative Energy Systems 8 o propeller-driven shaft that delivers energy is high above the ground s Wind Turbine Configurations o advantage of vertical axis allows the generator to be placed on the ground o MAE 14:650:474 Alternative Energy Systems 9 Wind Turbine Configurations...
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L8-+Fall+2011 - MAE 14:650:474 Alternative Energy Systems...

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