CFD Simulations on Interference Effects between Offshore Wind Turbines

The Science of Making Torque from Wind 2014

Weihing, P.^1 ; Meister, K.^1 ; Schulz, C.^1 ; Lutz, Th^1 ; Krämer, E.^1

Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, Pfaffenwaldring 21, 70569 Stuttgart, Germany^1

关键词: Aerodynamic effect;    Detached eddy simulations;    German aerospace centers;    Interference effects;    Measurement-based;    Turbulent inflow conditions;    Velocity spectrum;    Wake propagation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012143/pdf
DOI  :  10.1088/1742-6596/524/1/012143

来源: IOP

【 摘 要 】

This paper presents results of detailed 3D CFD simulations of two 5MW wind turbines sited in the German wind farm Alpha Ventus which are located behind each other at half-wake conditions. The focus of interest in this study is put on wake-turbine interaction, in order to derive the main shadow effects and their influence on blade loads and power response of the downstream turbine. For this purpose, Detached Eddy Simulations (DES) were performed using the flow solver FLOWer from DLR (German Aerospace Center). To consider all relevant aerodynamic effects, the main turbine components are represented as direct model with resolved boundary layers. Measurement-based turbulent inflow conditions are prescribed to realistically account for the atmospheric boundary layer. In order to analyze the flow conditions in front of the downstream turbine, wake propagation and velocity spectra are evaluated and compared with the undisturbed atmospheric boundary layer. Their impact on loads and power production and their corresponding fluctuations is discussed by comparing these with the upstream turbine. It was found, that fatigue loads occurring at half-wake conditions are significantly higher for the downstream turbine, since blade load fluctuations are highly amplified by the unsteady wake of the upstream turbine.