Design of Small Scale Wind Turbine Blade for Rural Villages Electrification
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Date
2014-10
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Addis Ababa University
Abstract
Designing small scale horizontal-axis wind turbine (HAWT) blade to achieve satisfactory levels
of performance starts with knowledge of the aerodynamic forces acting on the blade. In this
thesis Blade-element momentum theory (BEM) known as also strip theory, which is the current
mainstay of aerodynamic design and analysis of HAWT blade, is used for HAWT blade design.
The blade design program includes blade geometry parameters (chord-length and twist
distributions) and design conditions (design tip-speed ratio, design power coefficient and rotor
diameter) with the following inputs; power required from a turbine, number of blades,
environmental wind velocity at Negele Borana and blade profile type (airfoil type).
This thesis, focused on the design and stress analysis of small scale wind turbine blade which
built for the specific environmental conditions of the small rural village for Laga-Gula kebele
communities at Negele Borana. First the blade designed from the aspect of aerodynamic view
and the basic principles of the aerodynamic behaviors of HAWT studied. Second modeling and
stress analysis of the wind turbine blade are very critically for the further design and application
of wind turbine. The small-scale wind turbine blade was focused on, considering the E-Glass
fiber reinforced plastic material. Based on the parameters of airfoil and the geometrical
parameters of blade, the three-dimension and the assembly models of blades were established
with the SOLIDWORK modeling software. Then the models were imported into ANSYS-15
WORKBEANCH software analysis. The displacement, Von Misses and principal stress results
are determined. These results show that the positions of maximal displacement and maximum
stresses, but it is less than the safety displacement and Ultimate tensile strength (UTS) of the
xv
material, and also it shows the environmental wind speed can produced the sufficient power for
Laga-Gula rural kebele communities.
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Industrial Engineering