M. Mirhosseini1, A. Sedaghat, A.A. Alemrajabi, AERODYNAMIC MODELING OF WIND TURBINE BLADES AND LINEAR APPROXIMATIONS, SET2011, 10th International Conference on Sustainable Energy Technologies, İstanbul, TÜRKİYE, 4-7 Sep. 2011.
SET2011, 10th International Conference on Sustainable Energy Technologies, İstanbul, TÜRKİYE, 4-7 Sep. 2011
AERODYNAMIC MODELING OF WIND TURBINE BLADES AND LINEAR APPROXIMATIONS
M. Mirhosseini1, A. Sedaghat, A.A. Alemrajabi
Department of Mechanical Engineering, Isfahan University of Technology,
Isfahan 84156-83111, Iran
In this paper, Blade Element Momentum theory (BEM) is used to design a HAWT blade for a 200 kW wind turbine. The airfoil is
Risø, produced by RISØ National Laboratory, Denmark, for a class of 200KW wind turbines. Desirable properties of this airfoil
are related to enhancement of aerodynamic and structure interactions. The purpose of this study is to find a simpler linear
modification to the shape of blades. Design parameters considered here are wind tip speed ratio, nominal wind speed and
diameter of rotor. BEM is used for obtaining maximum lift to drag ratio for each elemental constitution of the blade. Obtaining
chord and twist distribution at assumed tip speed ratio of blade, the aerodynamic shape of the blade in every part is specified
which correspond to maximum accessible power coefficient. In order to simplify manufacturing of the blades, a linear
approximation is employed for both chord and twist distribution. The design parameters are trust coefficient, power coefficient,
angle of attack, angle of relative wind, drag and lift coefficients, axial and angular induction factors. The blade design
distributions are presented against rotor radius for BEM results and also compared with the linear approximation.
Keywords: Horizontal axis wind turbine (HAWT); Aerodynamic performance; BEM theory; Blade optimization;
Pitch control system.