Parametric study on off-design aerodynamic performance of a horizontal axis wind turbine blade and proposed pitch control. (15th March 2015)

• Record Type: Journal Article
• Authors: Najafian Ashrafi, Z.; Ghaderi, M.; Sedaghat, A.
• Is Part Of: Energy conversion and management. Volume 93(2015)
• Page Start: 349
• Page End: 356
• Publication Date: 2015-03-15
• Subjects: HAWTs -- BEM theory -- Aerodynamic design -- Pitch control -- Constant rotor speed; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.01.048
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A pitch controlled 200 kW HAWT blade is designed with BEM for off-design conditions. Parametric study conducted on power coefficient, axial and angular induction factors. The optimal pitch angles were determined at off-design operating conditions. Abstract: In this paper, a 200 kW horizontal axis wind turbine (HAWT) blade is designed using an efficient iterative algorithm based on the blade element momentum theory (BEM) on aerodynamic of wind turbines. The effects of off-design variations of wind speed are investigated on the blade performance parameters according to constant rotational speed of the rotor. The performance parameters considered are power coefficient, axial and angular induction factors, lift and drag coefficients on the blade, angle of attack and angle of relative wind. At higher or lower wind speeds than the designed rated speed, the power coefficient is reduced due to considerable changes in the angle of attacks. Therefore, proper pitch control angles were calculated to extract maximum possible power at various off-design speeds. The results showed a considerable improvement in power coefficient for the pitch controlled blade as compared with the baseline design in whole operating range. The present approach can be equally employed for determining pitch angles to design pitch control system of medium and large-scale wind turbines.