Document
www.nasa.gov
Sam Lee
Vantage Partners, LLC University of Washington
Stephanie Camello
Swept Wing Using Icing Tunnel Data
Method to Generate Full-Span Ice Shape on
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Introduction
NASA, FAA, ONERA, and university partners. Ice shapes obtained in NASA Icing Research Tunnel Hybrid models from 20%, 64%, and 83% span used Models have full-scale leading edge
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Current collaborative research program to improve the fidelity of experimental and computational simulation methods for swept-wing ice accretion formulations. Utilize 65% scale Common Research Model. Full-span ice shapes required for aerodynamic testing.
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Introduction (cont’d)
Each IRT models can generate 1 ft span of ice. Full-span ice shapes require 75 ft of ice. Large gaps between the three spanwise ice sections. Method developed to generate full-span ice shapes from the three 1 ft span ice shapes
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IRT Test Section
CRM - 65%
Introduction (cont’d)
National Aeronautics and Space Administration www.nasa.gov Accrete ice on the test article Spray the ice with white paint Install and set up the scanner Scan the ice shape
Ice Scan Data Acquisition Procedure
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The IRT scanner data acquisition procedure : National Aeronautics and Space Administration www.nasa.gov Align/combine scan passes Reduce data set Wrap surface Repair mesh/fill holes Coordinate transformation
Ice Scan Data Processing Procedure
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The IRT scanner data processing procedure consisted of the following five steps: National Aeronautics and Space Administration www.nasa.gov
Atmospheric and Space
th Atmospheric and Space Environments Conference, th Atmospheric and Space Environments Conference, th
3D Ice Shape Scanning Methodology
Lee, S., Broeren, A.P., Addy., H.E., Sills, R., and Pifer, E., “Development of 3D Ice Accretion Measurement Method,” AIAA 4 Environments Conference, New Orleans, LA, June 25-28, 2012, AIAA Paper 2012-2938. Lee, S., Broeren, A.P., Kreeger, R.E., Potapczuk, M., and Utt, L., “Implementation and Validation of 3-D Ice Accretion Measurement Methodology,” AIAA 6 Atlanta, GA, June 16-20, 2014, AIAA Paper 2014-2613. Broeren, AP, Addy, H.E., Lee, S., and Monastero, M.C., “Validation of 3-D Ice Accretion Measurement Methodology for Experimental Aerodynamic Simulation,” AIAA 6 Atlanta, GA, June 16-20, 2014, AIAA Paper 2014-2614.
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Ice Interpolation Methodology
Utilize weighted averaging function in Geomagic Studio. Results in “morphing” of ice shape from scanned section into an unscanned section.
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Interpolate ice shapes between the scanned sections. Demonstrated using existing scanned ice shapes from a swept NACA 0012 airfoil
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National Aeronautics and Space Administration www.nasa.gov Trim ice shape scalloped ice shape Begin with scalloped a single object Combine layers to create weighting technique ice shapes in layers using a Average the rime and scalloped a smooth transition
Ice Interpolation Methodolgy
Line up averaged layers to create ice shape Trim rime National Aeronautics and Space Administration Begin with rime ice shape www.nasa.gov
Ice Generation Methodology
– Basic morphing on a straight wing – Twist and taper without morphing – Twist and taper with morphing
A variety of combinations of rime, horn, and scalloped ice were morphed 3 main categories
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Rime to Horn
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Rime to Scallop
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5° twist
Horn With Twist
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0.5 scale taper
Horn With Taper
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5° twist & 0.5 scale taper
Rime to Scallop With Twist and Taper
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= 45°
= 0°,
NACA 0012,
Comparison of Interpolation Method to Real Ice
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Ice
Interpolated
Actual Ice
Comparison of Interpolation Method to Real Ice
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Spikes
Seams
Areas for Improvement
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Conclusion
Method developed to generate a full-span ice shape from partial spanwise section. Interpolated the ice shapes between the scanned sections using the weighted averaging function in Geomagic Studio. This procedure demonstrated using existing scanned ice shapes from a swept NACA 0012 airfoil. Initial results are promising. It was used to interpolate ice shapes between horn and rime shapes as well as scallop and rime shapes. This could also work with twisted and tapered wing. The ability to interpolate between two very different types of ice shape demonstrated.
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Conclusion (cont’d)
The resultant interpolated or “morphed” ice shape usually contains some surface artifacts, such as spikes or repeated patterns. These will be removed using a commercially available software called Geomagic Freeform. This software allows the user to hand-manipulate the interpolated ice shapes and will be used to remove these artifacts and also perform final touch-up on the ice shapes.
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