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Light Rotor: The 10-MW reference wind turbine

Light Rotor: The 10-MW reference wind turbine. Jens-Jakob Wedel Heinen, Tim Behrens Vestas Wind Systems A/S. Christian Bak Robert Bitsche, Anders Yde, Taeseong Kim, Morten H. Hansen, Frederik Zahle, Mac Gaunaa, José Blasques , Mads Døssing DTU Wind Energy, Risø Campus chba@dtu.dk.

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Light Rotor: The 10-MW reference wind turbine

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  1. Light Rotor:The 10-MW reference wind turbine Jens-Jakob Wedel Heinen, Tim Behrens Vestas Wind Systems A/S Christian Bak Robert Bitsche, Anders Yde, Taeseong Kim, Morten H. Hansen,Frederik Zahle, Mac Gaunaa,José Blasques, Mads Døssing DTU Wind Energy, Risø Campus chba@dtu.dk

  2. Background EWEA Conference, 2012 • Wind turbines and rotors aregrowing in size • Severalinvestigations have beencarried out to reveal the result of upscaling • Wind turbine masswillwithdirectupscalingincreasewith (rotor radius)3 • The power willonlyincreasewith (rotor radius)2 • The gravitywill have an increasingimpacton the loads • An obviousquestion is therefore: • Howshould the power of 3 for the wind turbine massbereduced in the process of upscaling? • More specifically: Howshould the power of 3 for the blade massbereduced? • That is the reason for establishing a project to investigatethisissue.

  3. Background Aero-dynamic design Aerodynamic design Aeroelastic design Struc-tural design Aero-elastic design Structural design Existingtechniques and methods New techniques and methods Add Presentation Title in Footer via ”Insert”; ”Header & Footer” EWEA Conference, 2012 The ”Light Rotor” project is a cooperationbetween DTU Wind Energy and Vestas The objective is to develop the basis for design of wind turbine blades for use on 10MW rotors with lower weight, tailored aeroelastic response and optimized aerodynamic efficiency. This will be achieved by developing and applying a combination of thick airfoils, blade sweep and optimized structure

  4. Thispresentation EWEA Conference, 2012 • Thispresentation is about the development of a 10MW reference wind turbine, where future ”light weight” designs canbecompared • This 10MW reference wind turbine is not expected to be an exceptional light weightconstruction, but rather a fair upscaling of an existingwind turbine • The presented turbine is iteration #2 in the design process and not the final design

  5. Outline EWEA Conference, 2012 • Basicconsiderations • The method • Results from the LR10-MW turbine • Aerodynamic design • Structural design • Aeroelasticstability • Loads • Conclusions

  6. Basicconsiderations R=89.17m RNA mass=629tons EWEA Conference, 2012

  7. Airfoilchoice Airfoilcharacteristics Aerodynamic design Structural design Aeroelastic design Final design The method EWEA Conference, 2012 FFA-W3-xxx airfoils. 24.1% to 36.0% relative thickness, 60% airfoilscaled from FFA-W3-360 and cylinder. XFOIL computations at Re 9x106to 13x106 3D corrected HAWTOPT numericaloptimizations. Max tip speed = 80m/s, l=8.06, min relative airfoilthickness = 24.1% ABAQUS (6.11) FEM computations. Uniaxial, biaxial and triaxial laminates were used together with PVC foam as sandwich core material HAWCSTAB2 (aero-servo-elasticstabilitytool) and HAWC2 (aeroelasticcode) computations. Class IA according to IEC-61400-1 standard for offshore application Iteration #2 is presented

  8. The LR10-MW turbine: Aerodynamic designHAWTOPT EWEA Conference, 2012

  9. The LR10-MW turbine: Structural blade designABAQUS EWEA Conference, 2012

  10. The LR10-MW turbine: Blade mass LR10MW blade Mass=47.9tons EWEA Conference, 2012

  11. The LR10-MW turbine: AeroelasticstabilityHAWCSTAB2 EWEA Conference, 2012

  12. The LR10-MW turbine: AeroelasticstabilityHAWCSTAB2 EWEA Conference, 2012

  13. The LR10-MW turbine: LoadsHAWC2 EWEA Conference, 2012

  14. Conclusions EWEA Conference, 2012 • A rotor and a wind turbine for a 10-MW wind turbine are designed with the shown results for Iteration #2 in the design process. • The design process will need more iterations between aerodynamic, structural and aeroelastic design. • It is of primary importance to design the rotor together with the entire system: Foundation, tower, drivetrain and rotor. • Several issues were highlighted: • Selecting the specific power is not trivial. For this rotor it was chosen to maintain the specific power of the artificial 5-MW wind turbine. • The mass of the LR10-MW blade seems to be somewhat too high compared to a blade directly upscaled from e.g. LM73.5P. • Estimating the drive trainmass is not trivial • The mass of the turbine is highlydependingonconcepts/technology • In the further work, the challenges in the control needs to be solved. • Also, the balance between power performance, loads and structural layout will be investigated further resulting in changes in the present design.

  15. Availability EWEA Conference, 2012 • The final design incl. aeroelastic model and blade layout willbeavailableon: • www.vindenergi.dtu.dk • under the menu Research • from July 1, 2012

  16. Acknowledgements EWEA Conference, 2012 Thanks to the Danish Energy Agency for partlyfunding the EUDP 2010-1 Light Rotor project

  17. Thankyou for the attention!

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