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The Science of Making Torque from Wind (TORQUE 2018)

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Room: BL.27.03
Chaired by:
Carlos Simao Ferreira | TUDelft
Topic: AA. Aerodynamics and Aeroacoustics
Form of presentation: Oral
Duration: 90 minutes

Authors:
Blondel Frédéric, Pauline Bozonnet, Marie Cathelain, Gilles Ferrer, Christos Galinos, Uwe Schmidt Paulsen, Helge Aagaard Madsen, Georg Pirrung, Frédéric Silvert

Abstract:
In this work, aero-elastic solvers predictions are compared with measured data from the NENUPHAR’s 1HS prototype. Blade and strut loads are considered. Various aerodynamic models are used, from simple Multiple StreamTube models up to the Actuator-Cylinder flow model and 2D/3D Vortex flow solvers. As a result, we show and discuss the different aero-elastic solver predictions and compare results with measured blade loads.

Authors:
Helge Aagaard Madsen, Niels N. Sørensen, Christian Bak, Niels Troldborg, Georg Pirrung

Abstract:
Design loads on turbines are normally based on aeroelastic models using anengineering BEM type model to compute the aerodynamic loads and with the turbulent inowgenerated with a turbulence model like the Mann model. There are several fundamentaluncertainties in this approach, e.g. how the unsteady induction in response to the turbulentow is computed. However, within the last few years full 3D CFD rotor computations withturbulent inow have been performed which can provide detailed insight into this complex loadresponse. In the present work we present computations with the EllipSys3D solver on the 80mdiameter NM80 turbine used in the DANAERO project where surface pressure measurementsat four radial positions were conducted. The aero dynamic loads integrated from the pressuredistributions have been derived and compared with computations by the EllipSys3D solver andthe aeroelastic code HAWC2. Overall good correlation is found by comparing PSD spectra ofthe measured and simulated loads. However, the comparison also illustrates the challenges inachieving the necessary resolution in the turbulent inow for the CFD simulations as a muchbigger cross section of the turbulence box is needed. A thorough discussion of the validationcases will be presented in the paper.

Authors:
Alois Peter Schaffarczyk, Ronan Boisard, Koen Boorsma, Bastian Dose, Lienard Caroline, Thorsten Lutz, Helge Aagaard Madsen, Hamid Rahimi, Torben Reichstein, Gerard J Schepers, Niels N Sørensen, Bernhard Stoevesandt, Pascal Weihing

Abstract:
Measurements from the MEXICO (2006) and NEW MEXICO (2014) experiment together with thermographic pictures from a 37-meter long blade were compared with RANS simulations using six different CFD codes enhanced with methods to detect free transition. It is shown that most codes show clear differences for fully turbulent and transitional (partly laminar) flow but it seems difficult to resolve the comparable small differences for MEXICO experiments on one side and the large extension of presumable laminar part on the suction side of a 37-meter blade on the other side. This project was conducted as work package 4.9 “Boundary Layer Transition” of IEAwind Task 29 “MexNext”

Authors:
Gerard Schepers, K. Boorsma, N. Sørensen, S. Voutsinas, G. Sieros, H. Rahimi, H. Heisselmann, E. Jost, T. Lutz, T. Maeder, A. Gonzalez, C. Ferreira, B. Stoevesandt, G Barakos, N. Lampropoulos, A. Croce, J. Madsen

Abstract:
The paper will present the final results of the EU FP7 project AVATAR (AdVanced Aerodynamic Tools of lArge Rotors). AVATAR is a project carried out by 13 partners. The project period was from November 1st 2013 until December 31st 2017. In the project aerodynamic and aero-elastic models have been validated and improved for large scale wind turbines in the range of 10-20 MW.

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