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The Science of Making Torque from Wind (TORQUE 2018)

20 June  |  21 June  |  22 June  |  Events View
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Room: BL.28 Carassa e Dadda
Chaired by: Vasilis Riziotis | NTUA
Topic: WWT. Wind, Wakes and Turbulence
Form of presentation: Oral
Duration: 110 minutes

Authors:
Victor Pablo Stein, Hans-Jakob Kaltenbach

Abstract:
Wind-tunnel measurements in the wake of a three bladed horizontal axis wind turbine model (HAWT) operating in yawed conditions are presented. Measurements are made at a constant tip speed ratio within two neutrally-stratified turbulent boundary layers of different aerodynamic roughness length to investigate its influence on the wake trajectory. It is found that the wake is less deflected with increasing terrain roughness. The recorded flow fiel is then used to assess the predictive capability of two analytical wake models.

Authors:
Dries Allaerts, Sam Vanden Broucke, Nicole van Lipzig, Johan Meyers

Abstract:
While research on wind-farm–atmospheric boundary layer interaction has primarily focused on local effects inside and above the farm, recent studies found that wind farms may affect the wind conditions several kilometres upstream of the farm via the excitation of atmospheric gravity waves. Such non-local effects can have strong implications for the wind-farm energy extraction but are currently overlooked in wind-farm design and operation and control strategies. The purpose of the present study is to assess the impact of wind-farm induced gravity waves on the annual energy production of the Belgian–Dutch offshore wind-farm cluster. To this end, we employ a recently developed fast wind-farm boundary-layer model and use ERA5 reanalysis data to obtain a representative set of atmospheric conditions.

Authors:
Tom T. B. Wester

Abstract:
Studies of the impact of gusty inflow on an adaptive camber airfoil were performed. The used airfoil was developed at TU Darmstadt and has a passive load reduction mechanism.Aim of this study is the investigation of dynamic loads on wind turbine blades under designed inflow conditions. Those inflow conditions should mimic an incoming gust or a tower passing of the blade. The adaptive camber arifoil is designed to damp such loads by passive decambering.Temporal highly resolved PIV at the suction side and force measurements of the modified Clark-Y profile were performed for the first time in the wind tunnel. The reproducible turbulent inflow was generated by means of an active grid.

Authors:
Thomas Herges, Jonathan Berg, Joshua Bryant, Jonathan White, Joshua Paquette, Brian Naughton

Abstract:
Sandia National Laboratories and the National Renewable Energy Laboratory conducted a wake-steering field campaign at the Scaled Wind Farm Technology facility. The campaign included the use of two highly instrumented V27 wind turbines, an upstream met tower, and high-resolution wake measurements of the upstream wind turbine using a customized scanning lidar from the Technical University of Denmark (DTU). The present work investigates the impact of the upstream wake on the downstream turbine power, blade loads, and nacelle accelerations as the wake sweeps across the rotor in various waked conditions. The wake position was tracked using the DTU SpinnerLidar and synchronized to the met tower and turbine sensors. Initial analysis shows a power increase when the wake was located next to the rotor edge, accompanied with an increased mean blade root flap moment, and a large power decrease in the fully waked condition.

20 June  |  21 June  |  22 June  |  Events View
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