www.eera-avatar.eu This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grand agreement No FP7-ENERGY-2013-1/n° 608396 . AVATAR project Advanced Aerodynamic Tools for lArge Rotors Gerard Schepers 2016 Wind Turbine Blade Workshop Sandia National Laboratories, USA August 31 st , 2016
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Gerard Schepers - Advanced Aerodynamic Tools for Large Rotors (AVATAR) Project
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www.eera-avatar.eu
This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grand agreement No FP7-ENERGY-2013-1/n° 608396 .
AVATAR projectAdvanced Aerodynamic Tools for lArge Rotors
Gerard Schepers
2016 Wind Turbine Blade WorkshopSandia National Laboratories, USA
1. Energy Research Centre of the Netherlands, ECN (Coordinator)
2. Delft University of Technology, TUDelft
3. Technical University of Denmark, DTU
4. Fraunhofer IWES
5. University of Oldenburg, Forwind
6. University of Stuttgart, USTUTT
7. National Renewable Energy Centre, CENER
8. University of Liverpool/University of Glasgow, ULIV/UoG
9. Centre for Renewable Energy Sources and Saving, CRES
10.National Technical University of Greece, NTUA
11.Politecnico di Milano, Polimi
12.GE Global Research, Zweigniederlassung der General Electric Deutschland Holding GmbH, GE
13.LM Wind Power, LM
19-09-16
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Period
• Project period: November 1st 2013- November 1st 2017
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Main motivation for AVATAR:Aerodynamics of large wind turbines (10-20MW)
• We simply don’t know if present aerodynamic models are good enough to design 10MW+ turbines• 10MW+ rotors violate assumptions in current aerodynamic tools,
e.g.:– Reynoldsnumbereffects,– Compressibility effects– Thick(er)airfoils– Flowtransitionandseparation,– (More)flexibleblades– Flowdevices• Hence 10MW+ designs fall outside the validated range of
current state of the art tools.
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Avatar: Main objective
To bring the aerodynamic and fluid-structure models to a
next level and calibrate them for all relevant aspects of
large (10MW+) wind turbines
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Avatar: Work procedure– Problem:No10MWturbinesareonthemarketyetforvalidation– Hence:Validatesubmodels againstexperiments
• 5% Increase in energy production due to larger diameter• Key rotor load levels are maintained• Non-rotor loads exceededà Redesign of AVATAR rotor at end of project• Note: LCOE of AVATAR turbine assessed
in 1) taking into account additionaladvantage of lower wake effects
• Measurements up to Re = 15M (and low M)• DU00-W-212 selected as common airfoil– Alsomeasuredby:– LMuptoRE=6M– Forwind atcontrolledturbulentconditionsuptoRe=1M
• Results are brought into a ‘blind test’ – Measurementscomparedwithcalculations– Blindtestincludedparticipantsoutsideproject
DNW-HDGmodel,c=15cm
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DNW-HDG Wind Tunnel
General Tunnel Characteristics
Test section : 60cmx60cmFan Rpm : 200 – 820 Fan blade angle
– Newversion ofcorrelation based transitionmodelisdevelopedwithbetter performance2)
1) Niels N. Sørensen et al Prediction of airfoil performance at high Reynolds numbers EFMC 2014, Copenhagen 17-20 Sept 2014 2) S. Colonia et al Calibration of the g equation transition model for High Reynolds flows at low Mach To be published at the Science
§ Induced velocity variation at30%span:Effectofrootvortexatouter blade partinECN-rv will be reduced
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Summary
• AVATAR is an EU FP7 projects which aims to validate, improve and calibrateaerodynamic models for 10MW+ turbines with and without flow devices and withand without aero-elastic effects
• Several (wind tunnel) measurements have been taken which have helped to validateand improve (sub) models relevant for 10MW+ turbines
• Models of different degrees of fidelity are evaluated on two 10 MW reference wind turbines:– AVATARlowinduction turbinewith specialaerodynamic challenges– INNWIND.EUconventional induction turbine
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Summary
• The amount of results from the AVATAR project is far too much to present in 15-20 minutes• AVATAR led to several model improvements and lessons learned e.g:
– Transition modelling• Originalcorrelation based transitionmodels deficient athighReynoldsnumbers• Updated version ofcorrelation based transition models hasbecome available• Guidelineson theemploymentoftransition(andturbulence)modelsformulated
– Improved predictions for lowMachconditions incompressible codes– Improved models for thick airfoils– Improved modelsfor flowdevices (flaps, vortexgenerators,rootspoilers)– Firstpossibilities for rotormodelimprovements identified (many morewill follow…)– Improved calculational efficiency and reduced timeto set-upcalculation– Expansion/integration ofcodes(e.g.coupling ofaero-elastic models to freevortexwakemethods)– Bestpracticeguidelines ongridresolutions andtemporalresolution
This project has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grand agreement No FP7-ENERGY-2013-1/n° 608396 .