Enhancement of wind turbine aerodynamic performance by a numerical optimization technique |
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Authors: | Hyung Il Kwon Ju Yeol You Oh Joon Kwon |
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Affiliation: | 1.Department of Aerospace Engineering,Korea Advanced Institute of Science and Technology (KAIST),Daejeon,Korea |
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Abstract: | Sectional aerodynamic design optimization was performed to enhance the aerodynamic performance of horizontal axis wind turbine
rotor blades based on a computational fluid dynamics technique. The proposed sectional optimization framework consists of
airfoil section contour modeling by the PARSEC shape function and a modified feasible direction search algorithm. To enhance
the aerodynamic performance of wind turbine rotor blades, the objective of the design framework was set to maximize the lift-over-drag
ratio for each design section. A two-dimensional Navier-Stokes flow solver coupled with a transition turbulence model was
used to evaluate the aerodynamic performance during the iterative design optimization procedure. The sectional flow conditions
were extracted from the flow of a three-dimensional rotor blade configuration. The design framework was applied to the National
Renewable Energy Laboratory Phase VI rotor blade. The design optimization was conducted at nine spanwise sections of the rotor
blade. To validate the present methodology, the aerodynamic performances of the original baseline rotor and the rotor after
the design optimization were compared by using a three-dimensional Navier-Stokes flow solver. It was found that approximately
11% of torque enhancement was achieved after the aerodynamic shape design optimization. |
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