• A Detached-Eddy-Simulation study: Proper-Orthogonal-Decomposition of the wake flow behind a model wind turbine 

      Göing, Jan; Bartl, Jan Michael Simon; Mühle, Franz Volker; Sætran, Lars Roar; Thamsen, Paul Uwe (Journal article; Peer reviewed, 2018)
      In times of intense renewable energy development, the planning of wind farms and the improvement of their total efficiency has become a major field of research. A precise analysis of the velocity deficit, fluctuation load ...
    • Blind test comparison of the performance and wake flow between two in-line wind turbines exposed to different turbulent inflow conditions 

      Bartl, Jan Michael Simon; Sætran, Lars Roar (Journal article; Peer reviewed, 2017)
      This is a summary of the results of the fourth blind test workshop that was held in Trondheim in October 2015. Herein, computational predictions on the performance of two in-line model wind turbines as well as the mean and ...
    • Blind test comparison on the wake behind a yawed wind turbine 

      Mühle, Franz Volker; Schottler, Jannik; Bartl, Jan Michael Simon; Futrzynski, Romain; Evans, Steve; Bernini, Luca; Schito, Paolo; Draper, Martín; Guggeri, Andrés; Kleusberg, Elektra; Henningson, Dan S.; Hölling, Michael; Peinke, Joachim; Adaramola, Muyiwa S.; Sætran, Lars Roar (Journal article; Peer reviewed, 2018)
      This article summarizes the results of the “Blind test 5” workshop, which was held in Visby, Sweden, in May 2017. This study compares the numerical predictions of the wake flow behind a model wind turbine operated in yaw ...
    • Experimental study on power curtailment of three in-line turbines 

      Bartl, Jan Michael Simon; Ostovan, Yasar; Uzol, Oguz; Sætran, Lars Roar (Journal article; Peer reviewed, 2017)
      A dataset of wind tunnel power and wake flow measurements on a setup of three aligned model wind turbines is presented. The power outputs of the three turbines are in good agreement with measurements from a full-scale wind ...
    • Experimental validation of analytical wake and downstream turbine performance modelling 

      Polster, Felix; Bartl, Jan Michael Simon; Mühle, Franz Volker; Thamsen, Paul Uwe; Sætran, Lars Roar (Journal article; Peer reviewed, 2018)
      Wake effects in wind farms can cause significant power losses. In order to reduce these losses layout and control optimization can be applied. For this purpose, simple and fast prediction tools for the wake flow are needed. ...
    • Performance of the NREL S826 airfoil at low to moderate Reynolds numbers — A reference experiment for CFD models 

      Bartl, Jan Michael Simon; Sagmo, Kristian Forfot; Bracchi, Tania; Sætran, Lars Roar (Journal article; Peer reviewed, 2019)
      Lift, drag and surface pressure measurements are performed on a wing section of the NREL S826 wind turbine airfoil at eight Reynolds numbers ranging from 0:5_105 to 6:0_105. Alongside with the measurements two types of ...
    • Validation of the real-time-response ProCap measurement system for full field wake scans behind a yawed model-scale wind turbine 

      Bartl, Jan Michael Simon; Müller, Andreas; Landolt, Andrin; Mühle, Franz Volker; Vatn, Mari; Oggiano, Luca; Sætran, Lars Roar (Journal article; Peer reviewed, 2018)
      For an accurate prediction of the complex flow conditions in wind farms, model scale wake flow measurements represent important references in well-defined boundary conditions. State-of-the art flow measurement techniques ...
    • Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear 

      Bartl, Jan Michael Simon; Mühle, Franz Volker; Schottler, Jannik; Sætran, Lars Roar; Peinke, Joachim; Adaramola, Muyiwa S.; Holling, Micheal (Journal article; Peer reviewed, 2018)
      The wake characteristics behind a yawed model wind turbine exposed to different customized inflow conditions are investigated. Laser Doppler anemometry is used to measure the wake flow in two planes at x∕D = 3 and x∕D = 6, ...
    • Wind tunnel experiments on wind turbine wakes in yaw: redefining the wake width 

      Schottler, Jannik; Bartl, Jan Michael Simon; Mühle, Franz Volker; Sætran, Lars Roar; Peinke, Joachim; Hölling, Michael (Journal article; Peer reviewed, 2018)
      This paper presents an investigation of wakes behind model wind turbines, including cases of yaw misalignment. Two different turbines were used and their wakes are compared, isolating effects of boundary conditions and ...
    • Wind tunnel study on power output and yaw moments for two yaw-controlled model wind turbines 

      Bartl, Jan Michael Simon; Mühle, Franz Volker; Sætran, Lars Roar (Journal article; Peer reviewed, 2018)
      In this experimental wind tunnel study the effects of intentional yaw misalignment on the power production and loads of a downstream turbine are investigated for full and partial wake overlap. Power, thrust force and yaw ...