iv
Performance prediction of HAWTs is important because it gives an idea
about the power production of a HAWT in out of design conditions without making
any experiments. Since the experiments of fluid mechanics are difficult to afford,
developing some models is very beneficial.
There are some models developed about this subject using miscellaneous
methods. In this study, one can find &ldquo / Vortex Theory&rdquo / among one of these theories.
Some basic 3D aerodynamics was discussed in order to make the reader to
understand the main subject of this study. Just after that, performance prediction of
constant speed, stall controlled HAWTs was discussed.
In order to understand the closeness of this theory to experiments, as a
sample, NREL &ldquo / Combined Experiment Rotor&rdquo / was considered. Performances
obtained by AEROPOWER, written in Visual Basic 6.0 and Excel combination, and
experimental results were compared for different wind velocities. Acceptable results
were obtained for wind speeds not much different than the design wind speed. For
relatively lower wind speeds, due to &ldquo / turbulence&rdquo / , and for relatively higher wind
speeds, due to &ldquo / stall&rdquo / , the program did not give good results. In the first case it has
not given any numerical result.
Power curves were obtained by only changing the settling angle, and only
changing the rotor angular speed using AEROPOWER. It was seen that, both settling
angle and rotor rpm values influence the turbine power output significantly.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605715/index.pdf |
| Date | 01 December 2004 |
| Creators | Yucel, Burak |
| Contributors | Cetinkaya, Tahsin Ali |
| 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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