lift and drag forces in wind turbine ppt

Medieval “Post Mill” ~12th Century U Rotation results in a “relative wind, Vrelativewhich results in higher Lift than from wind U alone L U Vrotation Vrelative L D α In-plane force D Thrust Force Component of Lift Force does useful rotational work “torque” (radius x In-plane force) Same Principles Apply to Modern Wind Turbines Tilted Flat Plate Creates Lift Component “Angle of Attack” α L U D “Angle of Attack” α ~10 degrees L U D As “Angle of Attack” decreases degrees then lift increases and drag decreases Utilization of wind 3000 years ago These are considered drag machines Moving Plate Allows Power To Be Extracted U d Power, P=V x d V Disadvantage of movement in direction of wind is that the wind force on the plate is reduced because it sees a lower relative wind (U-V) When wind blows against a surface it exerts a force – which can be very large U D Wind exerts a large force but you need movement to allow power to be extracted other air rushes in to fill the void thus, wind blows WIND Source:.some patches of air become warmer than others.the atmosphere is heated unevenly by the Sun.This presentation focuses on flow around horizontal axis wind turbine blades.The speed may vary from a few millimeter/s to hundreds of meters per second.

flow around a bug to flow around the Earth.) The scale may vary from a few millimeters to hundreds of meters.Boundary Layer – simplifies the analysis of flows by separating the “viscous” (sticky) layer close to a body “the boundary layer” from the bulk of the flow passing by the body.Prandtl (1874-1953), a German Engineer, formulated a large number of major theories related to this subject – one of the most important being Boundary Layer theory in 1904.Aerodynamics is the study of motion of air and how it interacts with a moving or stationary object.A branch of dynamics – How things move under the action of forces.Aerodynamics of Wind Turbines 101 Women of Wind, MaPresented by Emil MorozĪcknowledgements Slides and some of the themes behind the slides were borrowed from a variety of sources including, but not limited to: TU Delft Georgia Tech UC Davis Middle East Technical University NREL Bonus (now Siemens) Etc.

Lift and drag forces in wind turbine ppt