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In-flight measurement of ice growth on an airfoil using an array of ultrasonic transducersResults from three research flights to obtain in-flight ultrasonic pulse-echo measurements of airfoil ice thickness as a function of time using an array of eight ultrasonic transducers mounted flush with the leading edge of the airfoil are presented. The accuracy of the thickness measurements is found to be within 0.5 mm of mechanical and stereophotograph measurements of the ice accretion. The ultrasonic measurements demonstrate that the ice growth rate typically varies during the flight, with variations in the ice growth rate for dry ice growth being primarily due to fluctuations in the cloud liquid water content. Discrepancies between experimental results and results predicted by an analytic icing code underline the need for a better understanding of the physics of wet ice growth.
Document ID
19870035190
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hansman, R. John, Jr.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Kirby, Mark S.
(MIT Cambridge, MA, United States)
Mcknight, Robert C.
(NASA Lewis Research Center Cleveland, OH, United States)
Humes, Robert L.
(Calspan Corp. Arnold Air Force Station, TN, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Air Transportation And Safety
Report/Patent Number
AIAA PAPER 87-0178
Accession Number
87A22464
Funding Number(s)
CONTRACT_GRANT: NAG3-666
CONTRACT_GRANT: NGL-22-009-640
Distribution Limits
Public
Copyright
Other

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