Task 20 HAWT Aerodynamics and Models from Wind Tunnel Measurements


task_20.pngTask 20: HAWT Aerodynamics and Models from Wind Tunnel Measurements

Duration: 2002-2007

Operating Agent: National Renewable Energy Laboratory, USA

Participants: Canada, Denmark, Greece, the Netherlands, Norway, Spain, Sweden, United States

  • Acquire accurate, reliable, high-resolution experimental aerodynamic and structural loads data for horizontal axis wind turbines representative of full-scale machines.
  • Analyze these data using methodologies designed to reveal the flow physics responsible for phenomena observed on horizontal axis turbines.

Progress and Achievements

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.

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. Once relevant data was obtained and converted to the desired format each participating country analyzed the data within their existing research program.

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, were used to validate the accuracy and reliability of new or modified subcomponents.


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The Task 20: HAWT Aerodynamics and Models from Wind Tunnel Measurements Final Report, published in 2008, summarized the activities and research analyses conducted by the IEA Wind TCP Task 20 from 2002-2007.