Designing horizontal-axis wind turbine (HAWT) blades to achieve satisfactory
levels of performance starts with knowledge of the aerodynamic forces acting on
the blades. In this thesis, HAWT blade design is studied from the aspect of
aerodynamic view and the basic principles of the aerodynamic behaviors of
HAWTs are investigated.
Blade-element momentum theory (BEM) known as also strip theory, which is
the current mainstay of aerodynamic design and analysis of HAWT blades, is used
for HAWT blade design in this thesis.
Firstly, blade design procedure for an optimum rotor according to BEM theory
is performed. Then designed blade shape is modified such that modified blade will
be lightly loaded regarding the highly loaded of the designed blade and power
prediction of modified blade is analyzed. When the designed blade shape is
modified, it is seen that the power extracted from the wind is reduced about 10%
and the length of modified blade is increased about 5% for the same required
power.
BLADESIGN which is a user-interface computer program for HAWT blade
design is written. It gives blade geometry parameters (chord-length and twist
distributions) and design conditions (design tip-speed ratio, design power
coefficient and rotor diameter) for the following inputs / power required from a
turbine, number of blades, design wind velocity and blade profile type (airfoil
type). The program can be used by anyone who may not be intimately concerned
with the concepts of blade design procedure and the results taken from the program
can be used for further studies.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605790/index.pdf |
| Date | 01 February 2005 |
| Creators | Duran, Serhat |
| Contributors | Albayrak, Kahraman |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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