IEA ANNEX-XIV/XVIII: Field Rotor Aerodynamics / EFRAD

At this site two IEA R&D wind projects are described:

1. IEA ANNEX-XIV 'Field Rotor Aerodynamics' and its successor
2. IEA ANNEX-XVIII 'Enhanced Field Rotor Aerodynamics Database (EFRAD)'.

In these projects a co-operation has been established between several institutes working on the field of detailed aerodynamic measurements on full scale wind turbines. The projects resulted in a database of measurements, which in principle is available for outside parties. The site contains information about:

IEA ANNEX-XIV

Partners

• Energy Research Centre of the Netherlands ECN (Operating Agent)
• Delft University of Technology, DUT, Netherlands
  Institute for Windenergy, Delft University of Technology
• Imperial College, IC and Rutherford Appleton Laboratory, RAL Dept. of Aeronautics
• National Renewable Energy Laboratory, NREL, USA
• RISØ National Laboratory, Denmark
  RISO, National Laboratory The Test Station for Wind Turbines

Background and Objective

Results
The final report is available in PDF format:

• final report without appendices (1.24 Mbyte) 
• appendices part I (4.30 Mbyte)
• appendices part II (3.95 Mbyte).

IEA ANNEX-XVIII

IEA ANNEX-XVIII is an extension of the IEA ANNEX-XIV project in which five parties (DUT, ECN, NREL, RISØ, IC) from four countries (the Netherlands, Denmark, United Kingdom and the USA) cooperated in performing aerodynamic field experiments on full scale horizontal axis wind turbines. The project resulted in a unique database of local aerodynamic properties taken under atmospheric conditions: In conventional measurement programs, the aerodynamic behaviour of a wind turbine has to be analysed by means of measurements of integrated, total (blade or rotor) loads. These loads consist of an aerodynamic and a mass induced component and they are integrated over a certain spanwise length. This gives only indirect information about the aerodynamics at blade element level. The supply of local aero dynamic measurements, as carried out in ANNEX-XIV is a major step forward in understanding the aerodynamic behaviour of wind turbines. Note that the main emphasis was on understanding the aerodynamic behaviour at stalled conditions.

IEA ANNEX-XVIII has been defined on basis of the recommendations which have been formulated at the end of IEA ANNEX-XIV. The main objectives of IEA ANNEX-XVIII are:

• Maintenance of the IEA ANNEX-XIV database. In order to reach this objective the feedback from the users of the database is essential;
• Extension of IEA ANNEX-XIV database with new measurements.

Results
The final report is available in PDF format:

• final report (PDF file)

General information

• Characteristics of the facilities 
• Request full list of files in the database
• Introduction to the database. Some global information is given about the way how the database is organised. Furthermore some users of the database are listed, as well as some relevant references.

The work has been made possible by the initiative of the IEA Executive Committee.
General email address IEA ANNEX-XIV/XVIII: iea-xviii-l@remove-this-part-ecn.nl.