- Additional Authors
- Description
- vi, 79 p. : ill.
- Summary
- "A theoretical and field experimental program has been carried out to investigate the use of tip devices on horizontal axis wind turbine rotors. The objective was to improve performance by the reduction of tip losses. While power output can always be increased by a simple radial tip extension, such a modification also results in an increased gale load both because of the extra projected area and longer moment arm. Tip devices have the potential to increase power output without such a structural penalty. A vortex lattice computer model was used to optimize three basic tip configuration types for a 25 kW stall limited commercial wind turbine. The types were a change in tip planform, and a single-element and double-element nonplanar tip extension (winglets). A complete data acquisition system was developed which recorded three wind speed components, ambient pressure, temperature, and turbine output. The system operated unattended and could perform real-time processing of the data, displaying the measured power curve as data accumulated in either a bin sort mode or polynomial curve fit. Approximately 270 hr of perormance data were collected over a three-month period"--NTIS abstract.
- Uniform Title
- NASA contractor report ; NASA CR-174991.
- Subject
- Note
- Bibliography (note)
- Includes bibliographical references (p. 63-64).
- Reproduction (note)
- Funding (note)
- Call Number
- GPO Microfiche NAS 1.26:174991
- OCLC
- marcive228026651
- Author
Gyatt, G. W.
- Title
Development and testing of tip devices for horizontal axis wind turbines [microform] / G.W. Gyatt and P.B.S. Lissaman ; prepared for National Aeronautics and Space Administration, Lewis Research Center; for U.S. Department of Energy, Conservation and Renewable Energy, Wind Energy Technology Division.
- Imprint
Monrovia, CA : AeroVironment, Inc., 1985.
- Series
NASA contractor report ; NASA CR-174991.
- Bibliography
Includes bibliographical references (p. 63-64).
- Reproduction
Microfiche. [Washington, D.C. : National Aeronautics and Space Administration]. 1986. 1 microfiche : negative.
- Funding
NASA contract DEN 3-341; U.S. Dept. of Energy ... under interagency agreement DE-A101-76ET20320.
- Added Author
Lissaman, Peter B. S.
Lewis Research Center.
United States. Department of Energy. Wind Energy Technology Division.
AeroVironment Inc.
- Gpo Item No.
0830-H-14 (MF)
- Sudoc No.
NAS 1.26:174991