Abstract
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Article Information:
Evaluation of Comparative Performance of Three Wind Turbine Rotors
Basharat Salim and Mahir Es-Saheb
Corresponding Author: Basharat Salim
Submitted: May 21, 2012
Accepted: June 15, 2012
Published: January 11, 2013 |
Abstract:
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This study presents the performance evaluation of wind turbine implementing the mathematical model
based on Blade Element Momentum (BEM) theory. The investigation concentrates on the comparison of power
producing characteristics of three types of rotors for a horizontal axis wind turbine. The rotors considered have
rectangular plan form shape with sections fabricated from aerofoil sections of NACA families. The three families of
NACA airfoils used in this investigation are NACA4424, NACA23024 and NACA62-206. The lift and drag
characteristics, of the rotors were experimentally obtained using 250 mm span and 60 mm chord rotor blades in an
Armfield 300×300 mm subsonic, suction type and closed jet wind tunnel. The wind speeds used in the investigation
were in the range of 8 to 11 m/s, which is the range of wind speeds found near the coastal belt and the mountainous
parts of Saudi Arabia. Three bladed rotor subscale models of the wind turbines rotors having 250 mm rotor
diameter, 100 mm blade span and 30 mm chord were used for testing rotational behavior of the wind turbines in a
Plinth 600×600 mm blow down wind tunnel facility. The parameters used for the comparison in this study include
variations in setting angle, diameters, tip speed ratio, taper, wind speed and angle of attack. It is observed that rotors
with NACA4424 aerofoil sectioned blades produce more power at lower wind speeds and lower angles of attack
where as rotors with NACA23024 aerofoil sectioned blades generate better performance at higher wind speeds and
higher angles of attack. Further the taper of the rotors produced more decrease in the mass of the rotors than the
decrease power produced by these. The reduction in mass could drastically decrease the inertia of the rotors which
could result in higher rotational motions. Results depict the dependence of power produced on the Cd/Cl
characteristics of the rotors.
Key words: Blade element momentum theory, fluid dynamics design, wind power, wind turbines, , ,
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Cite this Reference:
Basharat Salim and Mahir Es-Saheb, . Evaluation of Comparative Performance of Three Wind Turbine Rotors. Research Journal of Applied Sciences, Engineering and Technology, (02): 606-618.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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