OC6 project Phase III: validation of the aerodynamic loading on a wind turbine rotor undergoing large motion caused by a floating support structure
article
Bergua, R.
Robertson, A.
Jonkman, J.
Branlard, E.
Fontanella, A.
Belloli, M.
Schito, P.
Zasso, A.
Persico, G.
Sanvito, A.
Amet, E.
Brun, C.
Campana-Alonso, G.
Martin-San-Roman, R.
Cai, R.
Cai, J.
Qian, Q.
Maoshi, W.
Beardsell, A.
Pirrung, G.
Ramos-Garcia, N.
Shi, W.
Fu, J.
Corniglion, R.
Lovera, A.
Galvan, J.
Nygaard, T.A.
Santos, C.R. dos
Gilbert, Ph.
Joulin, P.A.
Blondel, F.
Frickel, E.
Chen, P.
Hu, Z.
Boisard, R.
Yilmazlar, K.
Croce, A.
Harnois, V.
Zhang, L.
Li, Y.
Aristondo, A.
Mendikoa Alonso, I.
Mancini, S.
Savenije, F.
Marten, D.
Soto-Valle, R.
Schulz, C.W.
Netzband, S.
Bianchini, A.
Papi, F.
Cioni, S.
Trubat, P.
Alarcon, D.
Molins, C.
Cormier, M.
Bruker, K.
Lutz, T.
Xiao, Q.
Deng, Z.
Haudin, F.
Goveas, A.
This paper provides a summary of the work done within Phase III of the Offshore Code Comparison
Collaboration, Continued, with Correlation and unCertainty (OC6) project, under the International Energy
AgencyWind Technology Collaboration Programme Task 30. This phase focused on validating the aerodynamic
loading on a wind turbine rotor undergoing large motion caused by a floating support structure. Numerical models
of the Technical University of Denmark 10MW reference wind turbine were validated using measurement
data from a 1 V 75 scale test performed during the UNsteady Aerodynamics for FLOating Wind (UNAFLOW)
project and a follow-on experimental campaign, both performed at the Politecnico di Milano wind tunnel. Validation
of the models was performed by comparing the loads for steady (fixed platform) and unsteady (harmonic
motion of the platform) wind conditions. For the unsteady wind conditions, the platform was forced to oscillate
in the surge and pitch directions under several frequencies and amplitudes. These oscillations result in a wind
variation that impacts the rotor loads (e.g., thrust and torque). For the conditions studied in these tests, the system
aerodynamic response was almost steady. Only a small hysteresis in airfoil performance undergoing angle
of attack variations in attached flow was observed. During the experiments, the rotor speed and blade pitch angle
were held constant. However, in real wind turbine operating conditions, the surge and pitch variations would
result in rotor speed variations and/or blade pitch actuations, depending on the wind turbine controller region
that the system is operating. Additional simulations with these control parameters were conducted to verify the
fidelity of different models. Participant results showed, in general, a good agreement with the experimental measurements
and the need to account for dynamic inflow when there are changes in the flow conditions due to the
rotor speed variations or blade pitch actuations in response to surge and pitch motion. Numerical models not
accounting for dynamic inflow effects predicted rotor loads that were 9% lower in amplitude during rotor speed
variations and 18% higher in amplitude during blade pitch actuations.
Collaboration, Continued, with Correlation and unCertainty (OC6) project, under the International Energy
AgencyWind Technology Collaboration Programme Task 30. This phase focused on validating the aerodynamic
loading on a wind turbine rotor undergoing large motion caused by a floating support structure. Numerical models
of the Technical University of Denmark 10MW reference wind turbine were validated using measurement
data from a 1 V 75 scale test performed during the UNsteady Aerodynamics for FLOating Wind (UNAFLOW)
project and a follow-on experimental campaign, both performed at the Politecnico di Milano wind tunnel. Validation
of the models was performed by comparing the loads for steady (fixed platform) and unsteady (harmonic
motion of the platform) wind conditions. For the unsteady wind conditions, the platform was forced to oscillate
in the surge and pitch directions under several frequencies and amplitudes. These oscillations result in a wind
variation that impacts the rotor loads (e.g., thrust and torque). For the conditions studied in these tests, the system
aerodynamic response was almost steady. Only a small hysteresis in airfoil performance undergoing angle
of attack variations in attached flow was observed. During the experiments, the rotor speed and blade pitch angle
were held constant. However, in real wind turbine operating conditions, the surge and pitch variations would
result in rotor speed variations and/or blade pitch actuations, depending on the wind turbine controller region
that the system is operating. Additional simulations with these control parameters were conducted to verify the
fidelity of different models. Participant results showed, in general, a good agreement with the experimental measurements
and the need to account for dynamic inflow when there are changes in the flow conditions due to the
rotor speed variations or blade pitch actuations in response to surge and pitch motion. Numerical models not
accounting for dynamic inflow effects predicted rotor loads that were 9% lower in amplitude during rotor speed
variations and 18% higher in amplitude during blade pitch actuations.
Topics
TNO Identifier
985421
Source
Wind Energy Science, 8, pp. 465-485.
Pages
465-485