Development and Design of a Form- Adaptive Trailing Edge for Wind Turbine Blades Master Thesis Alireza Taheri REMENA Batch 5 Matriculation Number - 33105532 Institut Thermische Energietechnik 10.02.2015
Agenda Project Objectives / Motivations Review of Other Concepts Design the Form-Adaptive Trailing Edge Numerically Modeling the Deflection Experimental Verifications Aerodynamic Characteristics Conclusions and Recommendations 2
Project Objectives / Motivations Toby Hudson. http://en.wikipedia.org/wiki/file:dome stic_pigeon_flock.jpg 3
Flexsys Inc. Concept for Wind Turbines http://flexsyswindenergy.com/ (Flexsys Inc. 2014, November 3rd) 4
Turbomachinery Concepts Developed Applications for Airfoils Large Form Adaptations Kinematic chain Shape Memory Alloys Volume stretching (fluid muscle) Tobias Müller, Entwicklung und Experimentelle Untersuchnung einer Formvariablen Turbomaschinenschaufel, 2005 5
The Structure of Wind Turbine Blades MIT Thechnology Review, 2014 http://www.technologyreview.com/news/508301/ge-hopes-to-make-its-cloth-wind-turbine-idea-fly/ MIT Thechnology Review, 2014, http://www.technologyreview.com/news/510031/the-quest-for-the-monster-wind-turbine-blade/ 6
Target Idea for Trailing Edge Actuation Tobias Müller, Entwicklung und Experimentelle Untersuchnung einer Formvariablen Turbomaschinenschaufel, 2005 7
The Required Mechanism 8
Modeling the Deflection 9
Modeling the Deflection 10
The Shape- Adapter Actuator 11
The Manufactured Flexible Airfoil 12
Wind Tunnel Investigations 13
The Experimental Verifications 14
Geometric Characteristics a=7 9.4 Deflection at 75 % of chord length New AOA after deflection 15
Pressure Vectors Upward Deflected Symmetric Geometry Downward Deflected 16
Aerodynamic characteristic Lift and Drag coefficient (downward deflection) 17
Aerodynamic characteristic Lift over Drag (downward deflection) 18
Comparisons with deflected NACA (Pressure vectors at 0 AOA) NACA Airfoil Trial Airfoil 19
Comparison with deflected NACA of Polar curves (downward deflection ) 20
Conclusions The missions of the project is fulfilled by: Design and development of adaptive shape airfoil by a set of pneumatic actuators, which can bend the airfoil at TE. 9.4 downward deflection 11.9 upward deflection Seamless and without any flap. With hollow and light structure The aerodynamic results: Local Active Flow control along the wind turbine blade Control of L/D with changing the airfoils camber Potential to elliminate the pitch control mechanism 21
Future Works Design a standard airfoil for further investigations. Wind Tunnel investigations in a certain range of AOAs. Material study (Price, Elasticity, Weight, ) Automatic pneumatic control with load sensors for shapeadapter actuators. Thank you for your attention 22