Spongy icing revisited: measurements of ice accretion liquid fraction in two icing wind tunnels

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DOIResolve DOI: http://doi.org/10.2514/6.2005-658
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TypeArticle
Proceedings titleAIAA 43rd Aerospace Sciences Meeting and Exhibit
Series titleAIAA Paper
ConferenceAIAA 43rd Aerospace Sciences Meeting and Exhibit, Jan. 10-13, 2005, Reno, Nevada, U.S.A.
ISSN0146-3705
ISBN978-1-62410-064-2
Article numberAIAA 2005-658
Pages17; # of pages: 7
Subjectspongy ice; ice accretion; aircraft icing; Altitude Icing Wind Tunnel; CIGELE Icing Wind Tunnel
AbstractAIAA 2005-658: Fifty years ago, the phenomenon of spongy icing was well-known to the in-flight icing community. Subsequently, it has been forgotten by aerodynamicists, although atmospheric scientists and marine scientists have continued to investigate it. In this paper, its occurrence is documented in two icing wind tunnels: the Altitude Icing Wind Tunnel located at the National Research Council Canada, and the CIGELE Atmospheric Icing Research Wind Tunnel located at the Université du Québec à Chicoutimi. Several dozen trials were undertaken in each icing wind tunnel using a NACA 0012 airfoil. The liquid fraction of the resulting ice accretions was measured calorimetrically, using the same calorimeter at both locations. The results show that ice accretions formed under certain in-flight conditions can contain unfrozen liquid water in amounts up to 10% or more. The liquid fraction increases with increasing LWC and rising static temperature, while it decreases with increasing airspeed. There remains some uncertainty as to the effect of MVD.
Publication date
PublisherAmerican Institute of Aeronautics and Astronautics
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Aerospace Research
Access conditionavailable
unclassified
unlimited
Peer reviewedYes
NRC numberAL-2004-0050
NPARC number8933646
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Record identifiere847227c-0c11-4f94-99e0-46c3e541db71
Record created2009-04-23
Record modified2016-05-09
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