A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems

Two sets of experiments in the St. Anthony Falls Laboratory (SAFL) wave tank facility and atmospheric wind tunnel are integrated to provide a scaled representation of a floating wind turbine under heave and pitch motions due to ocean waves. The quasi-coupling is established by controlling the turbin...

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Autores principales:	C. Feist, F. Sotiropoulos, M. Guala
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Wind power Ocean Renewable Turbulent flow Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/feb873b84dcb4eb4adaff54f1415e8fc
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spelling	oai:doaj.org-article:feb873b84dcb4eb4adaff54f1415e8fc2021-11-30T04:15:42ZA quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems2095-034910.1016/j.taml.2021.100294https://doaj.org/article/feb873b84dcb4eb4adaff54f1415e8fc2021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S209503492100101Xhttps://doaj.org/toc/2095-0349Two sets of experiments in the St. Anthony Falls Laboratory (SAFL) wave tank facility and atmospheric wind tunnel are integrated to provide a scaled representation of a floating wind turbine under heave and pitch motions due to ocean waves. The quasi-coupling is established by controlling the turbine rotor speed to generate a thrust force mimicking steady or fluctuating wind gusts in the wave tank, and by using two actuators to oscillate a miniature turbine in the wind tunnel. Measured pitch and heave motions under varying waves are scaled down using rotor geometry and the wake meandering frequency to study the effect of the floating platform kinematics on the evolution and characteristics of the oscillating turbine wake. For a limited case of experimental conditions results provide a phenomenological and quantitative description of the floating-turbine system under variable waves and simulated wind gusts. Specifically, we demonstrate that wind gusts contribute to increase the platform pitch range, and that periodic large scale flow patches of high and low momentum flow are generated by the oscillating rotor in the turbulent boundary layer and are coherently convected through the wake. Both mechanisms could amplify the pitch response of downwind floating turbine units within the offshore power plant, in particular if the wave and/or wind forcing frequencies happen to approach the pitch natural frequency of the floating system.C. FeistF. SotiropoulosM. GualaElsevierarticleWind powerOceanRenewableTurbulent flowEngineering (General). Civil engineering (General)TA1-2040ENTheoretical and Applied Mechanics Letters, Vol 11, Iss 5, Pp 100294- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Wind power Ocean Renewable Turbulent flow Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Wind power Ocean Renewable Turbulent flow Engineering (General). Civil engineering (General) TA1-2040 C. Feist F. Sotiropoulos M. Guala A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
description	Two sets of experiments in the St. Anthony Falls Laboratory (SAFL) wave tank facility and atmospheric wind tunnel are integrated to provide a scaled representation of a floating wind turbine under heave and pitch motions due to ocean waves. The quasi-coupling is established by controlling the turbine rotor speed to generate a thrust force mimicking steady or fluctuating wind gusts in the wave tank, and by using two actuators to oscillate a miniature turbine in the wind tunnel. Measured pitch and heave motions under varying waves are scaled down using rotor geometry and the wake meandering frequency to study the effect of the floating platform kinematics on the evolution and characteristics of the oscillating turbine wake. For a limited case of experimental conditions results provide a phenomenological and quantitative description of the floating-turbine system under variable waves and simulated wind gusts. Specifically, we demonstrate that wind gusts contribute to increase the platform pitch range, and that periodic large scale flow patches of high and low momentum flow are generated by the oscillating rotor in the turbulent boundary layer and are coherently convected through the wake. Both mechanisms could amplify the pitch response of downwind floating turbine units within the offshore power plant, in particular if the wave and/or wind forcing frequencies happen to approach the pitch natural frequency of the floating system.
format	article
author	C. Feist F. Sotiropoulos M. Guala
author_facet	C. Feist F. Sotiropoulos M. Guala
author_sort	C. Feist
title	A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
title_short	A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
title_full	A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
title_fullStr	A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
title_full_unstemmed	A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
title_sort	quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/feb873b84dcb4eb4adaff54f1415e8fc
work_keys_str_mv	AT cfeist aquasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems AT fsotiropoulos aquasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems AT mguala aquasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems AT cfeist quasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems AT fsotiropoulos quasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems AT mguala quasicoupledwindwaveexperimentalframeworkfortestingoffshorewindturbinefloatingsystems
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A quasi-coupled wind wave experimental framework for testing offshore wind turbine floating systems

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