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Close-up analysis of inflight ice accretionThe objective of this effort was to validate in flight, data that has been gathered in the NASA Lewis Research Center's Icing Research Tunnel (IRT) over the past several years. All data was acquired in flight on the NASA Lewis Research Center's Twin Otter Icing Research Aircraft. A faired 3.5 in. diameter metal-clad cylinder exposed to the natural icing environment was observed by a close-up video camera. The grazing angle video footage was recorded to S-VHS video tape and after the icing encounter, the resultant ice shape was documented by 35 mm photography and pencil tracings. The feather growth area was of primary interest; however, all regions of the ice accretion, from the stagnation line to the aft edge of run back were observed and recorded. After analysis of the recorded data several interesting points became evident: (1) the measured flight feather growth rate is consistent with IRT values, (2) the feather growth rate appears to be influenced by droplet size, (3) the feathers were straighter in the lower, spottier LWC of flight in comparison to those observed in the IRT, (4) feather shedding and ice sublimation may be significant to the final ice shape, and (5) the snow encountered on these flights appeared to have little influence on ice growth.
Document ID
19940019050
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Reehorst, Andrew L. (NASA Lewis Research Center Cleveland, OH, United States)
Ratvasky, Thomas P. (NASA Lewis Research Center Cleveland, OH, United States)
Sims, James (Cortez 3 Services Corp. Brook Park, OH., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Subject Category
Air Transportation And Safety
Report/Patent Number
NASA-TM-106457
AIAA PAPER 94-0804
E-8318
NAS 1.15:106457
Meeting Information
Meeting: Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 10, 1994
End Date: January 13, 1994
Sponsors: AIAA
Accession Number
94N23523
Funding Number(s)
PROJECT: RTOP 505-68-10
CONTRACT_GRANT: NAS3-24816
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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