Croce, A.

Messmer, T.

Montenegro Montero, M.

Yilmazlar, K.

English

Archivio istituzionale della ricerca - Politecnico di Milano

Aerodynamic response of a wind turbine subjected to prescribed movements: experimental vs. numerical dataM. Montenegro Montero1, T. Messmer2, K. Yilmazlar1, Prof. A. Croce11 Department of Aerospace Science and Technology, Politecnico di Milano, Italy2 ForWind - Center for Wind Energy Research, University of Oldenburg, GermanyMay 25, 2023WESC 2023This project has received fundingfrom the European Union'sHorizon H2020 research andinnovation programme under theMarie Słodowska-Curie grantagreement N°860579.Wind tunnel measurements• Wake• Thrust• PowerMotivation2Turbine performanceWake behaviour Engineering models• Unsteady BEM• LLFVWHow do the floating motions affect a wind turbine?MoWiTO 0.6:• D = 0.58 m• TSR = 5.9• ω = 980 rpmGalleria del Vento PoliMi:• Boundary layer test section• U = 5 m/s• TI = 1.5%Floating motions:• 6 DoF platformAp = 6 mmfp = 3.3 HzTest 1: Cp, Ct curves for fixed case Test 2: Wake measurement using hot-wire arrayMeasurement campaign3Cases studied4Fixed Surge SwayUnsteady blade element momentum theory• 1D actuator disc + blade element• time-varying inflow conditions• tip loss factor and 3D correction includedEngineering models5Lifting line free vortex wake method• rotor represented by a lifting line• considers induced velocities created by trailing vortices shed from blade• circulation calculated from relative inflow velocity and cp, ctQblade CEFixed turbine characterization6MoWiTO optimal pitch determined as 0. Wake deficit of fixed turbine7• Hot wire measurements vs. LLFVW• 5 distances downstream from rotor analysed• Horizontal plane at hub heightU/Uinf (-)Wake deficit in surge case8• Surging motion generates pulse in the wake• Higher discrepancies between methodsU/Uinf (-)Wake deficit in sway case9• No recovery in the far wake with LLFVW• Sway motion causes meanderingU/Uinf (-)Turbine performance10Results from both simulation modelsWake measurements in the wind tunnel and using LLFVW• LLFVW overestimates power• Clear discrepancies in the far wake• Motions do not have an overall effect on turbine performance*, but do affect the wakeConclusions11Do prescribed motions affect the turbine’s performance and its wake? How well do engineering models match wind tunnel measurements?New measurement campaign under same conditions• Redo characterization of the turbine to validate model• Power and thrust measurements • Analyse results from different wind tunnels• Include all DoF + complex motionsNumerical anaylsis• Model validation• Inclusion of CFD simulationsContinuing work12mariana.montenegro@polimi.it/montenegromontero[1] Bergua, R., Robertson, A., Jonkman, J., Branlard, E., Fontanella, A., Belloli, M., Schito, P., Zasso, A., Persico, G., Sanvito, A., Amet, E., Brun, C., Campaña-Alonso, G., Martín-San-Román, R., Cai, R., Cai, J., Qian, Q., Maoshi, W., Beardsell, A., … Goveas, A. (2022). Oc6 Project Phase III: Validation of the aerodynamic loading on a wind turbine rotor undergoing large motion caused by a floating support structure. https://doi.org/10.5194/wes-2022-74 [2] Schottler, J., Hölling, A., Peinke, J., & Hölling, M. (2016). Design and implementation of a controllable model wind turbine for experimental studies. Journal of Physics: Conference Series, 753, 072030. https://doi.org/10.1088/1742-6596/753/7/072030 [3] Bayati, I., Bernini, L., Zanotti, A., Belloli, M., & Zasso, A. (2018). Experimental investigation of the unsteady aerodynamics of FOWT through PIV and hot-wire wake measurements. Journal of Physics: Conference Series, 1037, 052024. https://doi.org/10.1088/1742-6596/1037/5/052024 [4] Bayati, I., Belloli, M., Bernini, L., Boldrin, D. M., Boorsma, K., Caboni, M., Cormier, M., Mikkelsen, R., Lutz, T., & Zasso, A. (2018). Unaflow project: Unsteady aerodynamics of floating wind turbines. Journal of Physics: Conference Series, 1037, 072037. https://doi.org/10.1088/1742-6596/1037/7/072037 [5] Perez-Becker, S., Papi, F., Saverin, J., Marten, D., Bianchini, A., & Paschereit, C. O. (2020). Is the blade element momentum theory overestimating wind turbine loads? – an aeroelastic comparison between OpenFAST's aerodyn and QBlade's lifting-line free vortex wake method. Wind Energy Science, 5(2), 721–743. https://doi.org/10.5194/wes-5-721-2020 [6] Marten D, Lennie M, Pechlivanoglou G, Nayeri C N and Paschereit C O 2016, Journal of Engineering for Gas Turbines and Power 138072601References14

Aerodynamic response of a wind turbine subjected to prescribed movements: experimental vs. numerical data

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Aerodynamic response of a wind turbine subjected to prescribed movements: experimental vs. numerical data

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