Welcome to Task 20 Summary Page

HAWT Aerodynamics and
Models from Wind Tunnel

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National Renewable Energy Laboratory

Operating Agent Representative:
Scott Schreck
1617 Cole Blvd.
Golden, Colorado
United States
Tel: +1 303 384 7102
Fax: +1 303 384 6901
Email: Scott Schreck

Task 20 Final Report

The work of this annex increased understanding of the aerodynamics of horizontal axis wind turbines (HAWT) by using data from a full-scale wind tunnel experiment conducted in 2000 to develop and validate model subcomponents that can then be used to improve comprehensive aerodynamic models.

In 2000, a full-scale HAWT, called the NREL Unsteady Aerodynamics Experiment (UAE), was tested in the NASA Ames large wind tunnel [80 foot by 120 foot (24.4 m by 36.6 m)]. This test was designed to provide experimental measurements, having high spatial and temporal resolution, for a realistic rotating blade geometry, under closely matched conditions of dynamic similarity, and in the presence of strictly controlled inflow conditions.

Data Acquisition, Processing, and Quality Assurance
The raw data acquired during the UAE test in the NASA Ames 80 foot x 120 foot wind tunnel was processed in different ways during the task to serve the needs of the participants. Each participating organization had different, on-going aerodynamic research that benefited from this work.

Data Analysis and Exploitation
For each of the eight participants, once the data relevant to its work was obtained, converted to the desired format, and uncertainties established, analysis within the existing research program of the country was completed.

Model Subcomponent Construction or Modification
Once they gained an understanding of the HAWT flow field through analysis and exploitation of the UAE wind tunnel data set, participants worked to develop physics-based subcomponents for their relevant computational models. UAE wind tunnel data, or data derived via analysis and exploitation in conjunction with this Annex, can be used to validate the accuracy and reliability of new or modified subcomponents.

Participants: Canada, Denmark, Germany, Greece, Japan, Republic of Korea, the Netherlands, Norway, Spain, Sweden, and the United States. The final report was published in 2008.