Design of Wind Turbines

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Presentation transcript:

Design of Wind Turbines P M V Subbarao Professor Mechanical Engineering Department

Wind Speed Data @50m altitude

Effect of tip speed ratio on sensitivity to drag

The Power Extraction Analysis

Wind Flow Past A Locked Wind Turbine

Signatures of Wind Turbine on Wind & Recovery

Characteristic Parameter of A Wind Turbine Rotor The axial induction factor (of rotor) a is defined as: The available power in a cross-section equal to the swept area A by the rotor is:

Differentiating CP with respect to a yields: It is easily seen that CP, max = 16/27 for a = 1/3. This theoretical maximum for an ideal wind turbine is known as the Betz limit.

Geometric Design Options

Kinematics of Blade At any radius r Vwe Ub=rw Vfe=u Ub=rw Vai=u

Schematic drawing of the vortex system behind a wind turbine

Selection of Rotor Speed

Optimum Available Power due to Turbulent Wake Fraction of Betz Limit

Effect of tip speed ratio on sensitivity to drag

Common Industrial Practice

Aerofoil Geometry of Blades Wind = u Rotation = r * W Relative Wind = ur b

Wind Turbine Blade Specifications Wind = V0 Rotation = r * W Relative Wind = Vr a Airfoil: NACA 23024 Max thickness 24% at 30.3% chord. Max camber 2.9% at 1.3% chord

Blade Twist

Aerofoil Design Blade Tip Leading Edge Airfoil NACA 65-410 Root Section