The Aerodynamic Performance of Several Flow Control Devices for Internal Flow Systems.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
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An experimental research and development program was undertaken to develop and document new flow-control devices for use in the major modifications to the 40- by 80-Foot Wind Tunnel at Ames Research Center. These devices, which are applicable to other facilities as well, included grid-type and quasi-two-dimensional flow straighteners, louver panels for valving, and turning-vane cascades with net turning angles from 0 deg to 90 deg. The tests were conducted at model scale over a Reynolds number range from 200,000 to 1,700,000, based on chord. The results showed quantitatively the performance benefits of faired, low-blockage, smooth-surface straightener systems, and the advantages of curved turning-vanes with hinge-line gaps sealed and a preferred chord-to-gap ratio between 2,5 and 3.0 for 45 deg or 90 deg turns. Author
- Fluid Mechanics