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Modeling and Analysis of a Wind Turbine Blade with Active Profile Control Using a Shape Memory Alloy

Modeling and Analysis of a Wind Turbine Blade with Active Profile Control Using a Shape Memory Alloy. By: Jeffrey Mensch. Background from: http://www.peaceenergy.ca/releases/PEC_press_release_04_07_07/Wind%20Turbine.jpg. Project Description. Development of triple rotor blade wind turbine:

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Modeling and Analysis of a Wind Turbine Blade with Active Profile Control Using a Shape Memory Alloy

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  1. Modeling and Analysis of a Wind Turbine Blade with Active Profile Control Using a Shape Memory Alloy By: Jeffrey Mensch Background from: http://www.peaceenergy.ca/releases/PEC_press_release_04_07_07/Wind%20Turbine.jpg

  2. Project Description Development of triple rotor blade wind turbine: • 10-100 kW range • Choose blade design • Use active profile control • Choose shape memory alloy (SMA) • Compare efficiency of new model with current designs

  3. Tasks to Be Performed • Literature search (√) • Development of design (√) • Calculations • Construction of models • Testing and analysis

  4. Current Blades • Made out of graphite coated with epoxy • Lightweight • Somewhat flexible • Can be up to 60 meters long • Over time/due to strong gusts, can be damaged (blade fatigue) • Blades stall • Wind turbine loses efficiency

  5. Active Control - SMA • Wind still deforms blade • Strain gauges attached to blades • Heating via resistor coils will occur when strain reaches certain level • SMA blades would go back to original shape

  6. Active Control – Pitch Control • Default pitch: about 5° • Wind speed measured by anemometer • Pitch can be changed for optimal power output for given wind speed

  7. Blade Design NREL S809 foil chosen (type of Grumman Wind Stream blade) - is in common use for wind turbines Source: http://www.nasg.com/afdb/show-airfoil-e.phtml?id=1188

  8. SMA

  9. Pros and Cons of SMA Blades • Pros • Lasts longer than current blades • More efficient over time • Cons • More expensive • About 3x heavier (this can partially be avoided by only making the “skin” of the airfoil out of SMA)

  10. Calculations • Power Output • Defined by ½*CpρAV3 • Cp is the power coefficient (maximum is about .593 according to Betz limit) • ρ is the air density • A is the area swept by the wind turbine’s blades • V is the wind velocity

  11. Computer Programs Used • Winfoil • MATLAB

  12. Acknowledgements • Stevens Institute of Technology • Dr. Siva Thangam • Joseph Miles • GISS • NASA SHARP • MTSI

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