Searched for: author:"Schepers, J.G."
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Schepers, J.G. (author), Sanderse, B. (author), Carrion, M. (author), Rodriguez, C. (author)
The project is carried out by TNO, CWI, DNV-GL and Suzlon within the framework of TKI Wind op Zee and with subsidy from the Ministry of Economic Affairs and Climate, through RVO. The main objective of this project is to develop calibrated aerodynamic models with a quantified level of uncertainty for optimal design of the next generation of...
report 2021
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Schepers, J.G. (author), van Dorp, P. (author), Verzijlbergh, R. (author), Baas, P. (author), Jonker, H. (author)
This article describes a study in which the loads are assessed as calculated on a 10 MW wind turbine in response to extreme wind events on the North Sea. The turbine on which the loads are calculated is the 10 MW Reference Wind Turbine as designed in the EU project AVATAR (Sieros, et al., January 2015). The study is carried out within the Dutch...
article 2020
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Elgammi, M. (author), Schepers, J.G. (author), Osta-Omar, S. (author)
Horizontal axis wind turbines (HAWTs) experience three-dimensional rotational and unsteady aerodynamic phenomena at the rotor blades sections. These highly unsteady three-dimensional effects have a dramatic impact on the aerodynamic load distributions on the blades, in particular, when they occur at high angles of attack due to stall delay and...
article 2020
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Caboni, M. (author), Carrion, M. (author), Rodriquez, C. (author), Schepers, J.G. (author), Boorsma, K. (author), Sanderse, B. (author)
The general goal of the work reported in this paper is to gain more confidence when performing blade element momentum (BEM)-based aeroelastic simulations, especially when setting-up sub-models and their parameters. Due to limited or no information, the set-up of these methods is often highly uncertain. To achieve this objective, we have...
conference paper 2020
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Neunaber, I. (author), Holling, M. (author), Stevens, R.J.A.M. (author), Schepers, J.G. (author), Peinke, J. (author)
Wind turbines are usually clustered in wind farms which causes the downstream turbines to operate in the turbulent wakes of upstream turbines. As turbulence is directly related to increased fatigue loads, knowledge of the turbulence in the wake and its evolution are important. Therefore, the main objective of this study is a comprehensive...
article 2020
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Schepers, J.G. (author), Schreck, S.J. (author)
This article reviews the aerodynamic measurement programs on wind turbines that have been performed in the last decades. It is largely based on results from four projects carried out under auspices of the international Energy Agency (IEA), which are denoted as IEA Tasks 14, 18, 20, and 29. The aim of these projects was to collect and analyze...
article 2019
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Schepers, J.G. (author)
public lecture 2019
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Adema, N. (author), Kloosterman, M. (author), Schepers, J.G. (author)
Dynamic stall phenomena bring risk for negative damping and instability in wind turbine blades. It is crucial to model these phenomena accurately to reduce inaccuracies in predicting design driving (fatigue) loads. Inaccuracies in current dynamic stall models may be due to the facts that they are not properly designed for high angles of attack,...
article 2019
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Rahimi, H. (author), Schepers, J.G. (author), Shen, W.Z. (author), Ramos Garcia, N. (author), Schneider, W.S. (author), Micallef, D. (author), Simao Ferreira, C.J. (author), Jost, E. (author), Klein, L. (author), Herraez, I. (author)
This work presents an investigation on different methods for the calculation of the angle of attack and the underlying induced velocity on wind turbine blades using data obtained from three-dimensional Computational Fluid Dynamics (CFD). Several methods are examined and their advantages, as well as shortcomings, are presented. The investigations...
article 2018
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Vimalakanthan, K. (author), Schepers, J.G. (author), Shen, W.Z. (author), Rahimi, H. (author), Micallef, D. (author), Simao Ferreira, C.J. (author), Jost, E. (author), Klein, L. (author)
As part of the AVATAR and Mexnext projects, this study compares several methods used to derive lifting line variables from CFD simulations of the MEXICO rotor in yawed inflow. The results from six partners within the AVATAR/Mexnext consortium using five different methods of extraction were compared. Overall comparison of the induced velocities...
conference paper 2018
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Schaafarczyk, A.P. (author), Boisard, R. (author), Boorsma, K. (author), Dose, B. (author), Lienard, C. (author), Lutz, T. (author), Madsen, H.A. (author), Rahimi, H. (author), Reichstein, T. (author), Schepers, J.G. (author), Sorensen, N. (author), Stoevesandt, B. (author), Weihing, P. (author)
Since the investigation of van Ingen et al., attempts were undertaken to search for laminar parts within the boundary layer of wind turbines operating in the lower atmosphere with much higher turbulence levels than seen in wind tunnels or at higher altitudes where airplanes usually fly. Based on the results of the DAN-Aero experiment and the...
conference paper 2018
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Schepers, J.G. (author), Boorsma, K. (author), Sorensen, N. (author), Sieros, G. (author), Rahimi, H. (author), Heisselmann, H. (author), Jost, E. (author), Lutz, T. (author), Maeder, T. (author), Gonzalez, A. (author), Ferreira, C. (author), Stoevesandt, B. (author), Barakos, G. (author), Lampropoulos, N. (author), Croce, A. (author), Madsen, J. (author)
This paper presents final results from the EU project AVATAR in which aerodynamic models are improved and validated for wind turbines on a scale of 10 MW and more. Special attention is paid to the improvement of low fidelity engineering (BEM based) models with higher fidelity (CFD) models but also with intermediate fidelity free vortex wake (FVW...
conference paper 2018
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Dose, B. (author), Rahimi, H. (author), Stoevesandt, B. (author), Peinke, J. (author), Schepers, J.G. (author)
This work is aimed to investigate the effects of elastic blade deformations on the aerodynamics of large wind turbine rotors subjected to yawed inflow. Due to the increasing rotor size and advanced light weight blade designs, significant blade deflections can be observed on a regular basis for modern wind turbines. However, especially for...
conference paper 2018
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Vimalakanthan, K. (author), Caboni, M. (author), Schepers, J.G. (author), Pechenik, E. (author), Williams, P. (author)
Besides classical horizontal and vertical axis wind turbines, alternative ways to harvest wind energy are currently being explored. One promising concept is represented by airborne wind energy systems. Different airborne wind energy concepts have been ideated and investigated over the past few decades. The work reported here focuses on the...
conference paper 2018
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Schepers, J.G. (author), Lutz, T. (author), Boorsma, K. (author), Gomez-Iradi, S. (author), Herraez, I. (author), Oggiano, L. (author), Rahimi, H. (author), Schaffarczyk, P. (author), Pirrung, G. (author), Madsen, H.A. (author), Shen, W.Z. (author), Weihing, P. (author), Energieonderzoek Centrum Nederland (author)
This report describes the results from the third phase of IEA TCP Wind Task 29 Mexnext, denoted as Mexnext-III, in which 22 parties from 10 countries participated. The main impact of the Mexnext-III project lies in the insights offered in the accuracy of design models by which it is possible to assess design calculations in a more thorough way....
report 2018
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Rahimi, H. (author), Garcia, A.M. (author), Stoevesandt, B. (author), Peinke, J. (author), Schepers, J.G. (author)
This work presents a significantly improved engineering model for the prediction of the loads in yawed flow. The newly developedmodel focuses on the so-called skewedwake effect. This effect leads to an azimuthal variation of the axial induction velocity which depends on the yawangle, tip speed ratio,wind speed, andradial position.Theazimuthal...
article 2018
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Schepers, J.G. (author), Ceyhan, O. (author), Munduate, X. (author), Pires, O. (author), Madsen, J. (author), Jacobs, M. (author)
2D wind tunnel tests at high Reynolds numbers have been done within the EU FP7 AVATAR project (AdVanced Aerodynamic Tools of lArge Rotors) on theDU00-W-212 airfoil and at two different test facilities: the DNW High Pressure WindTunnel in Gottingen (HDG) and the LM Wind Power in-house wind tunnel. Two conditions of Reynolds numbers have been...
conference paper 2017
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Schepers, J.G. (author), Boorsma, K. (author)
To validate and reduce the uncertainty associated with noise prediction models for wind turbines, there is a need for detailed noise measurements on wind turbines in controlled conditions. However, high quality wind tunnel campaigns on horizontal axis wind turbine models are scarce due to the large wind tunnel size needed and consequently high...
conference paper 2017
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Schepers, J.G. (author), Werkhoven, E.J. (author), Giebel, G. (author), Wagenaar, J.W. (author), Hasager, C.B. (author), Mikkelsen, T. (author), Angelou, N. (author), Pena, A. (author), Energieonderzoek Centrum Nederland (author)
nvt
conference paper 2017
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Schepers, J.G. (author), Werkhoven, E.J. (author), Giebel, G. (author), Wagenaar, J.W. (author), Hasager, C.B. (author), Mikkelsen, T. (author), Angelou, N. (author), Pena, A. (author), Andreasen, S. (author)
nvt
public lecture 2017
Searched for: author:"Schepers, J.G."
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