Abstract
Abstract—The determination of lift (CL) and drag (CD) coefficients for Three-Blade Horizontal-Axis Wind Turbine (HAWT) power performance can be computed using the Q Blade software, and optimization by employing Taguchi design of experiments (DOE). In the present investigation, the orthogonal array (OA) L9 with 3-factors namely airfoil type, angle of attack, and Reynolds number with 3-levels are applied to determine single response optimization of CL and CD. For multiple response optimization, the Grey-based Taguchi is applied which combines the Taguchi orthogonal array with grey relational analysis to determine the grey relational grade, which can convert the multiple response grey relational grade into a single grey relational grade, thus the optimal design factors can be achieved. The obtained results show that the airfoil type S1210, attack angle 10 and Reynolds number 125000 are given the optimal value of 1.936 and 0.023 for lift and drag coefficients respectively. The most affected design factors for lift and drag coefficients are airfoil type with 43.64% contribution followed by attack angle with 35.69%, and least affected factor is Reynolds number with 12.5% contribution for this specific set of HAWT experiments.