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Experimental study of the DTU 10 MW wind turbine on a TLP floater in waves and wind
Bredmose, Henrik; Mikkelsen, Robert; Hansen, Anders Mandrup; Laugesen, Robert; Heilskov, Nicolai ;Jensen, Bjarne ; Kirkegaard, Jens
Publication date:2015
Link back to DTU Orbit
Citation (APA):Bredmose, H. (Author), Mikkelsen, R. (Author), Hansen, A. M. (Author), Laugesen, R. (Author), Heilskov, N.(Author), Jensen, B. (Author), & Kirkegaard, J. (Author). (2015). Experimental study of the DTU 10 MW windturbine on a TLP floater in waves and wind. Sound/Visual production (digital), European Wind EnergyAssociation (EWEA).
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Experimental study of the DTU 10 MW wind turbine
on a TLP floater in waves and wind
Henrik Bremose, Robert Mikkelsen, Anders Mandrup Hansen, Robert Laugesen DTU Wind Energy [email protected] Nicolai Heilskov, Bjarne Jensen, Jens Kirkegaard DHI Part of the INNWIND.EU project
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
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Scaling principles for floating wind turbine tests I
Define a length scale ratio Gravity is dominant! Ratio of force to gravity is preserved Hereby time scale ratio is locked: Preserve ratio of structural and fluid mass Classical Froude scaling of mass, length and time. Well known for wave tank tests.
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Scaling of rotor properties
Froude scaling of hydrodynamics: Keep overall geometry Keep consistent scaling of rotational frequency Preserve tip speed ratio Thrust force and thrust coefficient
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7.0N
1.5 m/s
1.5 m/s
1.5 m/s
1.5 m/s
74 RPM
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
Not
likely
to
scale
corr
ectly!
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
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Aerodynamic design
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Aerodynamic design
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Low-Re airfoils and 2D wind tunnel measurements
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Mold for blades
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Wind generator and hub
6 units, 4x4m, max speed of 1.7 m/s
rpm control, collective blade pitch
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
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Floater design
Compact, cost efficient
TLP was chosen – Bachynski (2014) gives input on design considerations
Designed with static model and a WAMIT based dynamic model
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Environmental conditions
Design requirements max tendon angle with vertical: 10 deg max tension: 1.8 x T
0
min tension: 0.2 x T0
Johannesen et al (2002); Bachynski (2014)
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The floater
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
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Wind field in rotor plane
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Rotor thrust
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Wave climates and RAOs
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
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Preliminary results
Regular, gentle waves
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Preliminary results Irregular waves close to rated wind speed with and without wind
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Preliminary results Irregular waves at close to rated wind speed
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Air velocities (model scale) ~ 1.5 m/s
Re (proto scale) ~ 10M
Re (model scale): ~ 25k
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Preliminary results Response to extreme focused wave
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Preliminary results Response to extreme focused wave Tendon tension
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Scaling principles
Aerodynamic design
Floater design Setup and validation
Preliminary results Gentle environment
Preliminary results Extreme environment
Froude-scaling of water and global aerodynamic loads Low Re leads to re-designed rotor with larger chord
Conclusions
10 MW rotor scaled to 1:60. Collective pitch and rpm control 2D wind tunnel test at Re down to 30k incorporated in design Wind generator 4x4 meter max speed of 1.7 m/s
TLP Ø18m, height 25m, draft 37m Static and dynamic design considerations
Wind field measured in sweeps at 12 levels. TI ~ 6 % Fairly uniform with slight 'under cut'
Wind effects and rotor effects clearly detectable Damping effects and RAOs investigated
Focused waves Response in platform motion Spectral analysis
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Experimental study of the DTU 10 MW wind turbine
on a TLP floater in waves and wind
Henrik Bremose, Robert Mikkelsen, Anders Mandrup Hansen, Robert Laugesen DTU Wind Energy [email protected] Nicolai Heilskov, Bjarne Jensen, Jens Kirkegaard DHI Part of the INNWIND.EU project