A summary of Reynolds number effects on some recent tests in the Langley 0.3-meter transonic cryogenic tunnelReynolds number effects noted from selected test programs conducted in the Langley 0.3-Meter Transonic Cryogenic Tunnel (0.3-m TCT) are discussed. The tests, which cover a unit Reynolds number range from about 2.0 to 80.0 million per foot, summarize effects of Reynolds number on: (1) aerodynamic data from a supercritical airfoil, (2) results from several wall interference correction techniques, and (3) results obtained from advanced, cryogenic tests techniques. The test techniques include: (1) use of a cryogenic sidewall boundary layer removal system, (2) detailed pressure and hot wire measurements to determine test section flow quality, and (3) use of a new hot film system suitable for transition detection in a cryogenic wind tunnel. The results indicate that Reynolds number effects appear most significant when boundary layer transition effects are present and at high lift conditions when boundary layer separation exists on both the model and the tunnel sidewall.
Document ID
19870045352
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Johnson, C. B. (NASA Langley Research Center Hampton, VA, United States)
Johnson, W. G., Jr. (NASA Langley Research Center Hampton, VA, United States)
Stainback, P.G. (NASA Langley Research Center Hampton, VA, United States)