Close-up analysis of aircraft ice accretionVarious types of ice formation have been studied by analysis of high magnification video observations. All testing was conducted in the NASA Lewis Icing Research Tunnel (IRT). A faired 8.9 cm (3.5 in.) diameter metal-clad cylinder and a 5.1 (2 in.) aluminum cylinder were observed by close-up and overview video cameras for several wind tunnel conditions. These included close-up grazing angle, close-up side view, as well as overhead and side overview cameras. Still photographs were taken at the end of each spray along with tracings of the subsequent ice shape. While in earlier tests only the stagnation region was observed, the entire area from the stagnation line to the horn region of glaze ice shapes was observed in this test. The modes or horn formation have been identified within the range of conditions observed. In the horn region, Horn Type A ice is formed by 'dry' feather growth into the flow direction and Horn Type B is formed by a 'wet' growth normal to the surface. The feather growth occurs when the freezing fraction is near unity and roughness elements exists to provide an initial growth site.
Document ID
19930039242
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hansman, R. J., Jr. (NASA Lewis Research Center Cleveland, OH, United States)
Breuer, Kenneth S. (NASA Lewis Research Center Cleveland, OH, United States)
Hazan, Didier (MIT Cambridge, MA, United States)
Reehorst, Andrew (NASA Lewis Research Center Cleveland, OH, United States)
Vargas, Mario (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Air Transportation And Safety
Report/Patent Number
AIAA PAPER 93-0029
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit