CFD Simulation: MEXICO Rotor Wake
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CFD Simulation: MEXICO Rotor Wake
EWEC: 2009Andreas Bechmann & Niels Sørensen
Risø DTU ∙ National Laboratory for Sustainable [email protected]
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Outline:
1. Background
2. MEXICO Experiment
3. CFD Simulations
4. Conclusion
17 March 09CFD Simulation of the MEXICO Rotor Wake2
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Background 1/3
“Today, siting of wind turbines in wind farms is based on power output considerations”
TOPFARM project: Optimization of wind farm topology based on power output and turbine loads.
WP1: Internal flow modelModel to describe the flow inside the wind farm
17 March 09CFD Simulation of the MEXICO Rotor Wake3
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Background 2/3
How to validate the model?
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Wind tunnelSingle wind turbine
Wind farm
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Background 3/3
Objectives:To make a “clean” dataset for validating wake models
Method:1.Extract wake data from the MEXICO experiment2.Compare measurements with high resolution CFD3.Combine measurements and CFD results in a dataset for validating wake models
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Wind tunnel
The MEXICO Experiment• Controlled conditions• PIV measure. 1.3D downstream• Open wind tunnel – tunnel effects?
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Outline:
1. Background
2. MEXICO Experiment
3. CFD Simulations
4. Conclusion
17 March 09Title of the presentation6
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
MEXICO Exp. 1/4 MEXICO Info:(pictures by ECN, NLR)
•Model Experiments in Controlled Conditions•Purpose: ”measurements on wind turbine model including the near wake”•Large tunnel of DNW used•Many groups participated: ECN was coordinator
The Vindtunnel:•Open section 9.5×9.5m•Max. air speed 30 m/s•Balance (3 forces/moments)
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
MEXICO Exp. 2/4
The Rotor:•4.5m diameter•3 airfoils for each blade:
1. Root: DU 91-W2-250
2. Mid: RISØ A1-213. Tip: NACA 63-418
•Zig-zag tape at 5% chord•Pitch angle -2.3 degrees•No signal from strain gages? (global rotor forces are estimated from the balance)•Pressure at 5 sections (25%,35%,60%,82%,95%)
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
MEXICO Exp. 3/4
The PIV measurements:• PIV measuring sheet (34×40cm) placed horizontally at 270 deg azimuth• In phase with rotor (freq=3 rotor revolutions) for 40s (100 samples) • Axial traverse at r/R=0.82• Radial traverses from r/R=0.5-0.9
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1.3D-1.0D-0.6D -0.4D 0.3D 1.0D
1/10 scale of DNW wind tunnel
•Clear tunnel effects in the far wake•Tunnel effects limited at the rotor
Doeke RozendalFlow field measurements on a small scale wind turbine model in the DNW PLST wind tunnel NLR-CR-2003-485
Niels N. Sørensen, Risø/DTUMEXICO, 3. Progress Meeting, Athens 28-29Nov. 2001
Earlier CFD findings
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
MEXICO Exp. 4/4
Selected data:•100 GB of data•Axi-symmetric cond. No yaw•Pitch angle -2.3 degree•425 rpm (tip speed 100m/s)•Wind speed: 10, 15, 24 m/s (tip speed ratio 10, 6.7, 4.2)
17 March 09CFD Simulation of the MEXICO Rotor Wake10
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Outline:
1. Background
2. MEXICO Experiment
3. CFD Simulations
4. Conclusion
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
The Simulations 1/5
CFD solver:•EllipSys3D•RANS: SST k-ω model•Fully turbulent•Steady-state simulations
Surface mesh:•All 3 blades meshed•256×64 cells on each
Volume mesh:•256 cells in normal direction (~7 rotor diameters)•Wake resolved approx 3D•Wind tunnel is not included
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
The Simulations 2/5
Rotor forces:Thrust. Estimated tower drag subtracted from balance forcePressure distributions.
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
The Simulations 3/5
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
The Simulations 4/5
Wake results:
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1.3D-1.0D-0.6D -0.4D 0.3D 1.0D
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
The Simulations 5/5
Validation dataset :1.Tunnel effects removed2.Expands further downstream3.Airfoil characteristics has been extracted which includes 3D effects
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
Outline:
1. Background
2. MEXICO Experiment
3. CFD Simulations
4. Conclusions
17 March 09CFD Simulation of the MEXICO Rotor Wake17
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Risø DTU, Technical University of DenmarkRisø DTU, Technical University of Denmark
• Wake data extracted from MEXICO database• CFD simulations of MEXICO wake were performed• Measurements and simulations compare well• Only the near-wake was simulated (~3D) (due to mesh topology)• Simulations with laminar–turbulent transition could be interesting• A new validation dataset for wake models without tunnel effects
Thank you for listening!
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Conclusions