Development and Design of a Form- Adaptive Trailing Edge for Wind Turbine Blades

Transcription

1 Development and Design of a Form- Adaptive Trailing Edge for Wind Turbine Blades Master Thesis Alireza Taheri REMENA Batch 5 Matriculation Number Institut Thermische Energietechnik

2 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

3 Project Objectives / Motivations Toby Hudson. stic_pigeon_flock.jpg 3

4 Flexsys Inc. Concept for Wind Turbines (Flexsys Inc. 2014, November 3rd) 4

5 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,

6 The Structure of Wind Turbine Blades MIT Thechnology Review, MIT Thechnology Review, 2014, 6

7 Target Idea for Trailing Edge Actuation Tobias Müller, Entwicklung und Experimentelle Untersuchnung einer Formvariablen Turbomaschinenschaufel,

8 The Required Mechanism 8

9 Modeling the Deflection 9

10 Modeling the Deflection 10

11 The Shape- Adapter Actuator 11

12 The Manufactured Flexible Airfoil 12

13 Wind Tunnel Investigations 13

14 The Experimental Verifications 14

15 Geometric Characteristics a=7 9.4 Deflection at 75 % of chord length New AOA after deflection 15

16 Pressure Vectors Upward Deflected Symmetric Geometry Downward Deflected 16

17 Aerodynamic characteristic Lift and Drag coefficient (downward deflection) 17

18 Aerodynamic characteristic Lift over Drag (downward deflection) 18

19 Comparisons with deflected NACA (Pressure vectors at 0 AOA) NACA Airfoil Trial Airfoil 19

20 Comparison with deflected NACA of Polar curves (downward deflection ) 20

21 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

22 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