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Aerodynamic Classification of Swept-Wing Ice AccretionThe continued design, certification and safe operation of swept-wing airplanes in icing conditions rely on the advancement of computational and experimental simulation methods for higher fidelity results over an increasing range of aircraft configurations and performance, and icing conditions. The current state-of-the-art in icing aerodynamics is mainly built upon a comprehensive understanding of two-dimensional geometries that does not currently exist for fundamentally three-dimensional geometries such as swept wings. The purpose of this report is to describe what is known of iced-swept-wing aerodynamics and to identify the type of research that is required to improve the current understanding. Following the method used in a previous review of iced-airfoil aerodynamics, this report proposes a classification of swept-wing ice accretion into four groups based upon unique flowfield attributes. These four groups are: ice roughness, horn ice, streamwise ice and spanwise-ridge ice. In the case of horn ice it is shown that a further subclassification of nominally 3D or highly 3D horn ice may be necessary. For all of the proposed ice-shape classifications, relatively little is known about the three-dimensional flowfield and even less about the effect of Reynolds number and Mach number on these flowfields. The classifications and supporting data presented in this report can serve as a starting point as new research explores swept-wing aerodynamics with ice shapes. As further results are available, it is expected that these classifications will need to be updated and revised.
Document ID
20140009585
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Diebold, Jeff M.
(Illinois Univ. at Urbana-Champaign Urbana, IL, United States)
Broeren, Andy P.
(NASA Glenn Research Center Cleveland, OH, United States)
Bragg, Michael B.
(Illinois Univ. at Urbana-Champaign Urbana, IL, United States)
Date Acquired
July 18, 2014
Publication Date
June 24, 2013
Subject Category
Aircraft Design, Testing And Performance
Aerodynamics
Report/Patent Number
GRC-E-DAA-TN9727
AIAA Paper 2013-2825
E-18753
NASA/TM-2013-216556
Meeting Information
Meeting: Atmospheric and Space Environments Conference
Location: San Diego, CA
Country: United States
Start Date: June 24, 2013
End Date: June 27, 2013
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 648987.02.03.03.10
Distribution Limits
Public
Copyright
Public Use Permitted.
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