Transition detection studies in the cryogenic environmentBoundary-layer transition detection studies were carried out in the 0.3 Meter Transonic Cryogenic Tunnel on a supercritical airfoil, using an infrared imaging system. The purpose of the experiments was to determine the extent of the temperature range in which commercially available IR systems can detect transition in cryogenic environment. The experiment was designed to take advantage of a combination of factors including the wind tunnel operation mode, the model construction materials and the IR system image processing options. During the initial phases of the study, the IR based findings were confirmed by measurements done with a micro-thin hot-film system. Ultimately, free and forced transition could be detected down to 170 K.
Document ID
19900058811
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gartenberg, Ehud (Old Dominion University Norfolk, VA, United States)
Johnson, William G., Jr. (Old Dominion Univ. Norfolk, VA, United States)
Johnson, Charles B. (Old Dominion Univ. Norfolk, VA, United States)
Carraway, Debra L. (Old Dominion Univ. Norfolk, VA, United States)
Wright, Robert E. (NASA Langley Research Center Hampton, VA, United States)