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Technical Memorandum

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National Aeronautics and Space Administration

Lewis Research Center

Cleveland, Ohio 44135–3191

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National Aeronautics and Space Administration

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Available electronically at http://gltrs.grc.nasa.gov

December 1991

NASA TM–105380

E–6767

WU–505–68–10

322

Brian M. Berkowitz, Mark G. Potapczuk, Bahman S. Namdar, and

Tammy J. Langhals

Aircraft icing; Performance characteristics; Multi-element airfoil

Unclassified -Unlimited

Subject Category: 02

Experimental Ice Shape and Performance Characteristics for a Multi-Element

Airfoil in the NASA Lewis Icing Research Tunnel

Brian M. Berkowitz and Tammy J. Langhals, Sverdrup Technology, Inc., Lewis Research Center Group, 2001 Aerospace

Parkway, Brook Park, Ohio 44142 (work funded by NASA Contract NAS3–25266). Mark G. Potapczuk, NASA Lewis

Research Center. Bahman S. Namdar, Boeing Commercial Airplane Group, Seattle, Washington 98124. Responsible

person, Brian M. Berkowitz, (216) 826–6662.

A14

An investigation of the ice accretion patterns and performance characteristics of a multi-element airfoil was undertaken in

the NASA Lewis Icing Research Tunnel. Several configurations were examined to determine the ice shape and performance characteristics. The testing included glaze, rime, and mixed icing regimes. Tunnel cloud conditions were set to

correspond to those typical of the operating environment for commercial transport aircraft. Measurements acquired

included ice profile tracings and aerodynamic forces both during the accretion process and in a post-accretion evaluation

over a range of angle of attack. Substantial ice accretions developed on the main wing, flaps and slat surfaces. Force

measurements indicate severe performance degradation, especially near CL max, for both light and heavy ice accretions.

Frost was seen on the lower surface of the airfoil which was found to contribute significantly to the force components.