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An optimum Horizontal Axis Wind Turbine (HAWT)
geometry can be generated by comparing the power efficiency of
different Tip Speed Ratios (TSR). The properties that generate
the optimum geometry are sorted as choosing the right airfoil
varying along the blade, blade width, twist angle and the Design
Tip Speed Ratio (DTSR). The blade length and twist angle can be
determined with the DTSR. The study chooses three different
DTSR values 6, 7 and 8 for the investigation, since in literature,
some researchers advice to choose between 5-10 and some others
6-8 [14] [15]. According to the three DTSR and chosen three
standard airfoils (NACA 64-415, RISØ-A1-21, NREL S809), nine
different HAWT geometries are generated. The chord length and
twist angle of the nine geometries are calculated based on the
Schmitz theory. For the theoretical calculation of the rotor
power efficiency, an algorithm is programmed in MATLAB®,
based on the Blade Element Momentum (BEM) theory. Also, the
nine HAWT dimensions are integrated to a Computer Aided
Design (CAD) code for the numerical calculation of the power
efficiency by ANSYS® Fluent Computational Fluid Dynamics
(CFD) computer package simulation program based on the
Finite Element Method (FEM). The results found in both BEM
and CFD are interpreted. How to determine the right geometry
dimensions that generate the highest power efficiency is
presented
1.st International Conference Energy Systems Engineering
ıcese'17
Mehmet Bakirci
Sezayi Yilmaz