Abstract:
This study fabricated a three bladed wind turbine of 0.6 m rotor diameter. The blade was divided into ten sections
and shape derived from the blade element and momentum theory with two linearization points at 70% and 90%..
Other design values chosen were; clark Y as the airfoil type, 2.5 as tip speed ratio, 1.1 as lift drag ratio, design angle
of attack of 8o. The rotor blades were fabricated using two layers of fibre reinforced plastic and 2% hardenning on
resin. The power coefficient of the turbine was tested in the wind tunnel by subjecting it to wind speeds ranging
from 4 m/s to 10 m/s in the wind tunnel testing. The wind tunnel used for the study was the Effel type with an exit
of 1.05 mX1.05 m and wind speed adjustable between 2 m/s to 22.5 m/s. An induction motor was used to provide
the load in the experiment and the synchronized frequency controlled by an inverter. A direct connection
generator was employed to the turbine rotors to determine the electricity generation capacity. The maximum
coefficient of power for the blade was found to be 0.26 at 10 m/s and 651 rpm. A variable resistance was used to
determine the electric power production at different rotational speed. A speed of 10 m/s gave the highest power
of 29.69 W at 891 rpm, 8 m/s gave the highest power as 15.43 W at 688 rpm, 6 m/s gave the highest power as 6.38
W at 552 rpm while 4 m/s gave the highest power as 1.74 W at 302 rpm. The Wind generator was then used to
charge a 54 AH, 12 V battery producing the highest electrical power of 32.03 W. The turbine is capapble of
producing power and would be applicable within area with low wind regimes providing power for small household
usage. However it is recommended that the design should be optimized to improve the coefficient of power.
