Segmented Variable Pitch Wind TurbineNelson Mandela Metropolitan University

Energy Postgraduate Conference 2013

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.

Concept

Design Process

Design Process

Proof of Concept

* Graphs not relatively similarly scaled

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.

Challenges• Reduce drag on design• Strength of structure• Control of segments• Balanced weight

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.

Questions?