segmented variable pitch wind turbine nelson mandela metropolitan university energy postgraduate...
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Segmented Variable Pitch Wind TurbineNelson Mandela Metropolitan University
Energy Postgraduate Conference 2013
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Introduction• Urban small scale turbines
operate in gusty conditions.• Warwick Wind Trials∙ 26 small scale turbines∙ 168 950 hours logged∙ Capacity factor of 0.85%
(4.15%)• Turbines need to be designed
for gusty conditions.• Developing a new concept
wind turbine designed to operate more effectively in gusty wind conditions.
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Concept
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Design Process
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Design Process
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Proof of Concept
* Graphs not relatively similarly scaled
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Research SignificanceLower cost per energy yield due to possible;•Higher power yield in gusty conditions.•Absolute pitch control – absolute control.•Variable Tip Speed Ratio (TSR) which has the following benefits:
• High starting torque.• Low cut-in wind speed.• Constant turbine speed for various wind
speeds.• Same turbine can be used for high or low shaft speeds.
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Challenges• Reduce drag on design• Strength of structure• Control of segments• Balanced weight
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Future development• Wind tunnel testing on aerofoil
profiles and segment designs (Cl/Cd).
• Wind tunnel testing for turbulent conditions.
• Continue reviewing and testing scaled concepts.
• Design and build full scale (Ø3m) turbine with segment control for proof of concept.
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Questions?