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Viscous and aeroelastic effects on wind turbine blades

Objective



OBJECTIVES OF THE PROJECT

The objectives of the project are:

To employ systematic 3-D Navier Stokes calculations for rotor blades of different shape in order to clarify the aerodynamic mechanisms associated to three-dimensional and rotational effects and their dependence on the geometrical and inflow parameters.
To revisit the dynamic stall problem from the aerolastic point of view using simple modeling of dynamics and advanced solvers for the aerodynamics. . To devise a comprehensive aerodynamic database including both the 3-D and the aeroelastic results. This database will be valuable for tuning and assessing the performance of simpler, engineering-type, models. . To provide a detailed step by step account of the progress, significant achievements and breakthroughs which have been built up so far on the aerodynamic and aeroelastic codes through JOU2-CT93-0345, JOR3-CT95-0007 and the current project.

TECHNICAL APPROACH

The technical approach is based on numerical investigations by means of advanced CFD (Computational Fluid Dynamics) techniques. All the computations will be performed with state-of-the art Navier-Stokes codes and turbulence models, which have been verified within the context of concluded and ongoing Joule projects. Four applied research oriented institutes (CRES, RISOE, FFA, DLR), three basic research oriented universities (DTU, VUB, NTUA) and a blade manufacturer (LM Glasfiber) are participating in the project.
EXPECTED ACHIEVEMENTS

The expected achievements are:

To perform a parametric study of three dimensional and rotational effects by means of 3-D Navier-Stokes solvers for different blade geometries - To investigate blade-wake interference effects
- To identify and understand the mechanisms of the three-dimensional separation and the radial effects in terms of the blade geometry and the operational conditions
- To open a new window in Navier-Stokes aeroelasticity using 2-D and quasi-3-D Navier Stokes solvers for the flow and simple mass-spring-damper supports for the structure.
- To review the state of the art of advanced aerodynamic modelling for wind energy converters by summarizing methodologies established and results obtained within the current and concluded relevant JOULE projects and, eventually, provide reference aerodynamic tools for the European Wind Energy Industry.
It is envisaged that the scientific conclusions of the project will provide the guidelines for a direct improvement of the state-of-the-art engineering tools which are used for machine design and certification.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

CENTRE FOR RENEWABLE ENERGY SOURCES
Address
Marathonos Avenue, Km. 19
19009 Raphina (Pikeermi)
Greece

Participants (7)

FFA - THE AERONAUTICAL RESEARCH INSTITUTE OF SWEDEN
Sweden
Address
Ranhammaarsvaegen, 12/14
161 11 Bromma
GERMAN AEROSPACE CENTRE
Germany
Address
Lilienthalplatz 7
38108 Braunschweig
LM Glasfiber A/S
Denmark
Address
1,Rolles Moellevej
6640 Lunderskov
National Technical University of Athens
Greece
Address

15710 Athens
RISOE NATIONAL LABORATORY
Denmark
Address
399,Frederiksborgvej 399
4000 Roskilde
TECHNICAL UNIVERSITY OF DENMARK
Denmark
Address
Nils Koppels Alle, Building 403
2800 Lyngby
VRIJE UNIVERSITEIT BRUSSEL
Belgium
Address
2,Pleinlaan 2
1050 Brussel