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Effect of Number of Blades and Blade Chord Length on the Performance of Darrieus Wind Turbine
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Volume 2, 2015
Issue 1 (January)
Pages: 16-25   |   Vol. 2, No. 1, January 2015   |   Follow on         
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Taher G. Abu-El-Yazied, Design and Production Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt.
Ahmad M. Ali, Design and Production Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt.
Mahdi S. Al-Ajmi, Department of Production Engineering Technologies, College of Technological Studies, PAAET, Kuwait.
Islam M. Hassan, Design and Production Engineering Department, Faculty of Engineering, Ain Shams University, Cairo, Egypt.
In this article we will go through some parameters like number of blades and blade chord length that influencing the efficiency of straight Darrieus wind turbines. For this purpose, twelve models created with different number of blades and blade chord lengths to study there effect on the performance of Darrieus wind turbine. Two dimensional Computational fluid dynamics (CFD) analyses have been performed on a straight-bladed Darrieus-type rotor. After describing the computational model, a complete campaign of simulations using K-ε turbulence model is chosen to perform the transient simulations and multiple reference frame (MRF) model capability of a (CFD) solver is used to express the dimensionless form of power output of the wind turbine as a function of the wind free stream velocity and the rotor’s rotational speed for a two, three, four and six-bladed architecture characterized by a NACA 0021 airfoil. It was found that, max power coefficient and its corresponding tip speed ratio were obtained at number of blades equal two and increase in power coefficient related to castelli wind turbine by 3.35%. Increasing in blade chord length increase the power coefficient till a certain limit after which power coefficient was dramatically decreased due to increase in solidity and decreasing corresponding tip speed ratio. Both torque ripple factor and normal force on turbine blade were decreased with increasing of the number of blades and decreasing the blade chord length.
Darrieus, Number of Blades, Blade Chord Length and Solidity
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