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Ice-Accretion Scaling Using Water-Film Thickness ParametersStudies were performed at INTA in Spain to determine water-film thickness on a stagnation-point probe inserted in a simulated cloud. The measurements were correlated with non-dimensional parameters describing the flow and the cloud conditions. Icing scaling tests in the NASA Glenn Icing Research Tunnel were then conducted using the Ruff scaling method with the scale velocity found by matching scale and reference values of either the INTA non-dimensional water-film thickness or a Weber number based on that film thickness. For comparison, tests were also performed using the constant drop-size Weber number and the average-velocity methods. The reference and scale models were both aluminum, 61-cm-span, NACA 0012 airfoil sections at 0 deg. AOA. The reference had a 53-cm-chord and the scale, 27 cm (1/2 size). Both models were mounted vertically in the center of the IRT test section. Tests covered a freezing fraction range of 0.28 to 1.0. Rime ice (n = 1.0) tests showed the consistency of the IRT calibration over a range of velocities. At a freezing fraction of 0.76, there was no significant difference in the scale ice shapes produced by the different methods. For freezing fractions of 0.40, 0.52 and 0.61, somewhat better agreement with the reference horn angles was typically achieved with the average-velocity and constant-film thickness methods than when either of the two Weber numbers was matched to the reference value. At a freezing fraction of 0.28, the four methods were judged equal in providing simulations of the reference shape.
Document ID
20030063154
Document Type
Contractor Report (CR)
Authors
Anderson, David N.
(Ohio Aerospace Inst. Brook Park, OH, United States)
Feo, Alejandro
(Instituto Nacional de Tecnica Aeroespacial Madrid, Spain)
Date Acquired
September 7, 2013
Publication Date
June 1, 2003
Subject Category
Meteorology And Climatology
Report/Patent Number
E-13519
AIAA-2002-0522
NASA/CR-2003-211826
NAS 1.26:211826
Meeting Information
Meeting: 40th Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 14, 2002
End Date: January 17, 2002
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WORK_UNIT: WU-708-20-13
CONTRACT_GRANT: NCC3-884
Distribution Limits
Public
Copyright
Public Use Permitted.
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