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Published byLeonard Mosey Modified about 1 year ago

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DESIGN OF AIRFOILS FOR WIND TURBINE BLADES Presented by Parezanovic Vladimir Faculty of Mechanical Engineering Belgrade University

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The Objectives Simulate the airflow around selected well- known airfoils Obtain sufficient level of agreement between experimental and simulated data Introduce “Virtual Prototyping” into the design process

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The process Importing or designing the geometry Generating the mesh Computational model setup Iteration and monitoring Results Post-processing

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Geometry and airfoils Geometry is designed or imported Airfoils investigated: NACA 63(2)215 FFA-W3-211 A-Airfoil

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Mesh generation The resolution of the mesh can affect computations in many ways, most important are: Accuracy Computing time Some facts about mesh used: Around elements 160 elements on the airfoil Quadrilateral shaped cells Cell size varies from m 2 up to 1.6 m 2

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Flow conditions Conditions corresponding to those in wind tunnel experiments: Low Reynolds number ( x10 6 ) Free flow velocities around 25m/s Low turbulence intensity

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Numerical model What kind of flow is modeled? To what level of approximation? What is expected to happen? Setup in this case: For NACA 63(2)215 and FFA-W3-211 model is fully turbulent Laminar/turbulent transition modeled for A-Airfoil k-ω SST turbulence model is used in all cases

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Lift and pitching moment coeff. curves (left), Drag coefficient curve (right) (A-Airfoil) A-Airfoil Lift and pitching moment coeff. curves (left), Drag coefficient curve (right) NACA63(2)215 NACA63(2)215 Results Lift and pitching moment coeff. curves (left), Drag coefficient curve (right) (FFA-W3-211) FFA-W3-211

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Interpretation Simulation results agree with experimental data to within 10% The model is more exact for airfoils less susceptible to laminar/turbulent transition effects Lift easier to predict than drag A model with the ability to predict laminar/turbulent transition is needed

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So, you’ve gotten your results… Then what?

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What was all this about? MONEY! EFFICIENCY ENVIRONMENT

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QUESTIONS?

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