Under class 3 to 4 wind conditions, S809 is subjected to low Mach number (almost incompressible) flow with Reynolds numbers in the range of one to two million. NREL Phase II, Phase III, and Phase VI HAWT blades are composed of S809 airfoil from root to tip. This airfoil is 21% thick laminar flow airfoil whose design and experimental results are given in. The present paper focuses on the optimization of most well-known NREL airfoil, known as the S809 airfoil. National Renewable Energy Laboratory (NREL) has developed a family of airfoils for HAWT applications since 1984. In modern wind-turbines, thick airfoils such as NACA-63XXX and NACA-64XXX are frequently used however, new airfoil families are increasingly being developed because of multiple requirements of aerodynamics performance at rated power conditions and off-rated power conditions as well as strong structural properties. The focus of this paper is on the aerodynamic shape optimization of airfoil sections used in wind turbine blades since they affect their aerodynamic performance which in turn influences the amount of power a wind turbine can generate. In last two decades, aerodynamic shape optimization has become an important tool in aircraft design. As a result, there has been significant effort devoted in recent years to shape optimization of wind turbine blade to achieve high. Thus, one of the goals of the design of a wind turbine blade is to maximize its.
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It is well established that the power generated by a HAWT is a function of the number of blades, the of the blade airfoil section, and the tip speed ratio λ (= rotational speed of the blade at tip/wind speed in free stream). Among wind-turbines, horizontal-axis-wind-turbines (HAWTs) are mostly deployed for power generation in Megawatt range.
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With recent emphasis on emission-free renewable energy, wind energy has taken a center stage in recent years with exponential growth in deployment of wind-turbines worldwide. In addition, MOGA results are in close agreement with those obtained by the adjoint-based optimization technique. The results show significant improvement in both lift coefficient and lift to drag ratio of the optimized airfoil compared to the original S809 airfoil.
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The commercially available software FLUENT is employed to calculate the flow field on an adaptive structured mesh using the Reynolds-Averaged Navier-Stokes (RANS) equations in conjunction with a two-equation SST turbulence model. The goal of this paper is to employ a multiobjective genetic algorithm (MOGA) to optimize the shape of a well-known wind turbine airfoil S809 to improve its lift and drag characteristics, in particular to achieve two objectives, that is, to increase its lift and its lift to drag ratio.