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Icing Encounter Duration Sensitivity StudyThis paper describes a study performed to investigate how aerodynamic performance degradation progresses with time throughout an exposure to icing conditions. It is one of the first documented studies of the effects of ice contamination on aerodynamic performance at various points in time throughout an icing encounter. Both a 1.5 and 6 ft chord, two-dimensional, NACA-23012 airfoils were subjected to icing conditions in the NASA Icing Research Tunnel for varying lengths of time. At the end of each run, lift, drag, and pitching moment measurements were made. Measurements with the 1.5 ft chord model showed that maximum lift and pitching moment degraded more rapidly early in the exposure and degraded more slowly as time progressed. Drag for the 1.5 ft chord model degraded more linearly with time, although drag for very short exposure durations was slightly higher than expected. Only drag measurements were made with the 6 ft chord airfoil. Here, drag for the long exposures was higher than expected. Novel comparison of drag measurements versus an icing scaling parameter, accumulation parameter times collection efficiency was used to compare the data from the two different size model. The comparisons provided a means of assessing the level of fidelity needed for accurate icing simulation.
Document ID
20110009983
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Addy, Harold E., Jr. (NASA Glenn Research Center Cleveland, OH, United States)
Lee, Sam (ASRC Aerospace Corp. Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
March 1, 2011
Subject Category
Air Transportation And Safety
Report/Patent Number
E-17303
AIAA Paper 2009-4263
NASA/TM-2011-216367
Meeting Information
Meeting: First Atmospheric and Space Environments Conference
Location: San Antonio, TX
Country: United States
Start Date: June 22, 2009
End Date: June 25, 2009
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 457280.()?O7.03.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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