Turbulent wind field characterization and re-generation based on pitot tube measurements mounted on a wind turbine

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This paper describes a new method to estimate the undisturbed inflow field of a wind turbine based on measurements obtained from one or more five-hole pitot tubes mounted directly on the blades. Based on the measurements, the disturbance caused by the wind turbine is estimated using aerodymanic models that compensate for axial and tangential induction, approximated by blade element momentum theory, radial expansion of the inflow, rotor tilt, dynamic and skew inflow, tip loss, as well as braking and circulation of the flow local to the airfoil. The wind speeds measured on the rotating blades give a better estimate of the turbulence intensity over the rotor plane than can be measured at a single point, e.g. using a cup anemometer, and in addition the wind shear profile can be derived. In addition the measurements can be used to constrain a synthetic turbulence model to exactly produce the measured wind speeds at the recording position. In the theoretical part of this study a quite good agreement is seen between load sensors on a turbine model exposed to the reference and the re-generated turbulence field. Finally the method is applied to full scale measurements and reasonable wind shear profiles are derived. It is expected that this method will lead to a new and effective experimental method to characterize the incoming flow field to a wind turbine and thus contribute to the understanding of wind turbine loads.
Original languageEnglish
Title of host publicationProceedings of 33rd Wind Energy Symposium
Number of pages13
PublisherAmerican Institute of Aeronautics and Astronautics
Publication date2015
ISBN (Electronic)978-1-5108-0115-8
Publication statusPublished - 2015
Event33rd AIAA/ASME Wind Energy Symposium - Kissimmee, FL, United States
Duration: 5 Jan 20159 Jan 2015
Conference number: 33


Conference33rd AIAA/ASME Wind Energy Symposium
Country/TerritoryUnited States
CityKissimmee, FL


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