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Altitude Effects on Thermal Ice Protection System Performance; a Study of an Alternative ApproachResearch has been conducted to better understand the phenomena involved during operation of an aircraft's thermal ice protection system under running wet icing conditions. In such situations, supercooled water striking a thermally ice-protected surface does not fully evaporate but runs aft to a location where it freezes. The effects of altitude, in terms of air pressure and density, on the processes involved were of particular interest. Initial study results showed that the altitude effects on heat energy transfer were accurately modeled using existing methods, but water mass transport was not. Based upon those results, a new method to account for altitude effects on thermal ice protection system operation was proposed. The method employs a two-step process where heat energy and mass transport are sequentially matched, linked by matched surface temperatures. While not providing exact matching of heat and mass transport to reference conditions, the method produces a better simulation than other methods. Moreover, it does not rely on the application of empirical correction factors, but instead relies on the straightforward application of the primary physics involved. This report describes the method, shows results of testing the method, and discusses its limitations.
Document ID
20160006686
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Addy, Harold E., Jr.
(NASA Glenn Research Center Cleveland, OH United States)
Orchard, David
(National Research Council of Canada Boucherville, Quebec, Canada)
Wright, William B.
(Vantage Partners, LLC Brook Park, OH, United States)
Oleskiw, Myron
(National Research Council of Canada Boucherville, Quebec, Canada)
Date Acquired
May 27, 2016
Publication Date
May 1, 2016
Subject Category
Air Transportation And Safety
Report/Patent Number
NASA/TM-2016-219081
GRC-E-DAA-TN30299
E-19208
Funding Number(s)
WBS: WBS 081876.02.03.08.02.02
CONTRACT_GRANT: NNC12BA01B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
ice protection system performance
altitude effects
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