computational flow optimization of wind turbine blades
TRANSCRIPT
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COMPUTATIONAL FLOW OPTIMISATION OF A WIND
TURBINE BLADE USING MRF
•P.Sarathkumar Reddy 22208101029
Internal Guide Mr. G. RAJU Asst.Prof.
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INTRODUCTION OF THE PROJECT
• This Project aims to undertake aerodynamic analysis of a
Horizontal Axis Wind Turbine
• Computational Fluid Dynamics (CFD) software is used to
compare the performance of different Wind Turbine Blade
Profile
• A steady state, incompressible flow solver for Multiple
Reference Frames (MRF)
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OBJECTIVEFIRST-CUT ANALYSIS • Flow optimization in different blade sections, with different Angle of
Attack (α)
• Geometry of the standard NACA-9417 Airfoil
• MH-102 from -Illinois University
• SC 02-0714 - Airfoil Investigation Website
SECOND-CUT ANALYSIS• Flow optimization in a blade with a add-on part which gives better result
• Winglet
FINAL ANALYSIS• Flow of air over a rotating wind turbine rotor implies that the fluid flows
in an inertial frame of reference while the rotor rotates in a non inertial reference frame
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BLADES WITH DIFFERENT AIRFOILS
NACA-9417
SC-02 0714
MH-102
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DIMENSIONS OF THE BLADE
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TOTAL VIEW OF BLADES
NACA-9417
SC-02 0714
MH-102
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BLADE WITH SURFACE MESH
MESH REFINEMENT
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PRISM LAYER SETTING IN T-GRID
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BLADE WITH FLUID VOLUME
8-PRISM LAYERS
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MESH DETAILS
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BLADE INSIDE THE TUNNEL
INLET
OUTLET
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BOUNDARY CONDITIONS SETTING
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CONVERGED SOLUTION
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STATIC PRESSURE CONTRIBUTION OVER THE BLADES
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NACA 9417
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MH-102
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SC-02 0714
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VELOCITY CONTRIBUTION OVER A BLADE
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NACA 9417
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VECTOR PLOT AROUND THE BLADE
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LIFT AND DRAG VALUES FOR THREE BLADES WITH DIFFERENT
ANGLE OF ATTACK-α
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COMPARISION GRAPHSCoefficient of Drag CD Vs alpha-α
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Coefficient of lift Vs alpha-α
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L/D RATIO Vs ALPHA -α
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Add-on part(winglet)
• After completion of first cut analysis, we finalized NACA-9417 at 10 degree angle of attack is giving the better results
• The blade which we got the better result , in that the add-on part(winglet) will be implemented and the second cut analysis starts in that configuration
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CAD MODEL OF NACA-9417 BLADE WITH WINGLET
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Winglet Details
Cant angle -70degree
Height-17mm
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MESHED MODEL OF NACA-9417 BLADE WITH WINGLET
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MESHED WINGLET
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PRISM LAYER SETTING IN T-GRID
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BLADE WITH WINGLET IN THE FLUID VOLUME
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MESH DETAILS
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WINGLET ASSEMBLY WITH TUNNEL
INLET
OUTLET
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BOUNDARY CONDITION SETTING
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CONVERGED SOLUTION
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STATIC-PRESSURE CONTOUR
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VELOCITY VECTOR CONTOUR
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COMPARISION OF LIFT WITH WINGLET
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COMPARISION OF DRAG WITH WINGLET
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GENERATOR ASSEMBLY
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THREE BLADE ASSEMBLY
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MESHED GENERATOR
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THREE VIEW OF TOTAL ASSEMBLY
Front view
Top view
Side view
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TOTAL ASSEMBLY WITH REAR PLATE
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MRF-CAPSULE
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MRF-capsule inside a volume tunnel
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CONVERGED SOLUTION
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Static pressure contour across total assembly
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Static pressure across the blades
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Static pressure across the generator
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Velocity contour across the blades
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Velocity vectors in the whole tunnel
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VECTOR PLOT ACROSS HUB
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VECTORS AROUND THE WINGLET
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Dynamic pressure contour
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Turbulence contour across generator
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CONCLUTION
• A growing number of researchers is using CFD to study wind-turbine wake aerodynamics
• More research on the effect of stratification on power production is to be expected
• Aerodynamics turbulence is a dominating factor, affecting the blade performance and Wake behaviour so we tried to reduce this factor in this analysis
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REFERENCES• H. Piggott. (2010, Scoraig Wind. Available: www.scoraigwind.com• K. Kishinami, et al., "Theoretical and Experimental Study on the Aerodynamic
Characteristic of a Horizontal Axis Wind Turbine," Elsevier, 2005.• Anderson, J.D. Computational Fluid Dynamics: The Basics with
Applications.McGraw-Hill, New York, NY, USA, 1995.• Gupta, A. Computational Fluid Dynamic Simulation of Wind Turbines. Master’s
thesis, The Pennsylvania State University, 2006.• Somers, Dan M., and Tangler, J. Design and Experimental Results for the S809• Airfoil. National Renewable Energy Laboratory (NREL) (1997).
• R. E. a. K. Sheldahl, P. C., "Aerodynamic Characteristics of Seven Airfoil Sections Through 180 Degrees Angle of Attack for Use in Aerodynamic Analysis of Vertical Axis Wind Turbines, "Sandia National Laborotories, Albuquerque, New Mexico, USA1981.