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Spectral analysis of New MEXICO standstill measurements to investigate vortex shedding in deep stallKhan, Muhammad A. (author), Ferreira, Carlos (author), Schepers, J.G. (author), Sørensen, Niels N. (author)Spectral analysis was performed on the time series data computed from pressure measurements on the New MEXICO (Model Rotor Experiments under Controlled Conditions) rotor in standstill conditions. As a priori, 3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to...journal article 2019
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Ferreira, Carlos (author), Gonzalez, A. (author), Baldacchino, D. (author), Aparicio, M. (author), Gomez, S (author), Munduate, X. (author), Garcia, N. R. (author), Sørensen, J. N. (author), Jost, E. (author), Knecht, S. (author), Lutz, T. (author), Chassapogiannis, P. (author), Diakakis, K. (author), Papadakis, G. (author), Voutsinas, S. (author), Prospathopoulos, J. (author), Gillebaart, T. (author), van Zuijlen, A.H. (author)The FP7 AdVanced Aerodynamic Tools for lArge Rotors - Avatar project aims to develop and validate advanced aerodynamic models, to be used in integral design codes for the next generation of large scale wind turbines (10-20MW). One of the approaches towards reaching rotors for 10-20MW size is the application of flow control devices, such as...journal article 2016
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Ceyhan, J. G Schepers O (author), Ceyhan, O (author), Boorsma, K. (author), Gonzalez, A. (author), Munduate, X. (author), Pires, O. (author), Sørensen, N. (author), Ferreira, Carlos (author), Sieros, G. (author), Madsen, J. (author), Voutsinas, S. (author), Lutz, T. (author), Barakos, G. (author), Colonia, S. (author), Heißelmann, H. (author), Meng, F. (author), Croce, A. (author)This paper presents the most recent 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. Measurements on a DU 00-W-212 airfoil are presented which have been taken in the pressurized DNW-HDG wind tunnel up to a Reynolds number of 15 Million. These measurements...journal article 2016
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Sørensen, Niels N. (author), Méndez, B. (author), Muñoz, A. (author), Sieros, G. (author), Jost, E. (author), Lutz, T. (author), Papadakis, G. (author), Voutsinas, S. (author), Barakos, G. N. (author), Colonia, S. (author), Baldacchino, D. (author), Baptista, C.F. (author), Ferreira, Carlos (author)The current paper presents the effort, in the EU AVATAR project, to establish the necessary requirements to obtain consistent lift over drag ratios among seven CFD codes. The flow around a 2D airfoil case is studied, for both transitional and fully turbulent conditions at Reynolds numbers of 3 × 10<sup>6</sup> and 15 × 10<sup>6</sup>. The...journal article 2016
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van Kuik, G.A.M. (author), Peinke, Joachim (author), Nijssen, Rogier (author), Lekou, Denja (author), Mann, Jakob (author), Sørensen, Jens Nørkær (author), Ferreira, Carlos (author), van Wingerden, J.W. (author), Schlipf, David (author), Gebraad, P.M.O. (author), Polinder, H. (author), Abrahamsen, Asger Bech (author), van Bussel, G.J.W. (author), Sørensen, John Dalsgaard (author), Tavner, Peter (author), Botasso, Carlo (author), Muskulus, Michael (author), Matha, Denis (author), Lindeboom, Han (author), Degraer, Steven (author), Kramer, Oliver (author), Lehnhoff, Sebastian (author), Sonnenschein, Michael (author), Sørensen, Poul Ejnar (author), Kunneke, R.W. (author), Morthorst, Poul Erik (author), Skytte, Klaus (author)The European Academy of Wind Energy (eawe), representing universities and institutes with a significant wind energy programme in 14 countries, has discussed the long-term research challenges in wind energy. In contrast to research agendas addressing short- to medium-term research activities, this eawe document takes a longer-term perspective,...review 2016