Modern Airfoil Ice Accretions

TITLE AND SUBTITLE:
Modern Airfoil Ice Accretions

AUTHOR(S):
Harold E. Addy, Jr., Mark G. Potapczuk, and David W. Sheldon

REPORT DATE:
March 1997

FUNDING NUMBERS:
WU-505-68-1C

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-10667

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-107423
AIAA-97-0174

SUPPLEMENTARY NOTES:
Prepared for the 35th Aerospace Sciences Meeting & Exhibit sponsored by the American Institute of Aeronautics and Astronautics, Reno, Nevada, January 6-10, 1997. Responsible person, Harold E. Addy, Jr., organization code 2720,
(216) 977-7467.

ABSTRACT:
This report presents results from the first icing tests performed in the Modern Airfoils program. Two airfoils have been subjected to icing tests in the NASA Lewis Icing Research Tunnel (IRT). Both airfoils were two dimensional airfoils; one was representative of a commercial transport airfoil while the other was representative of a business jet airfoil. The icing test conditions were selected from the FAR Appendix C envelopes. Effects on aerodynamic performance are presented including the effects of varying amounts of glaze ice as well as the effects of approximately the same amounts of glaze, mixed, and rime ice. Actual ice shapes obtained in these tests are also presented for these cases. In addition, comparisons are shown between ice shapes from the tests and ice shapes predicted by the computer code, LEWICE for similar conditions. Significant results from the tests are that relatively small amounts of ice can have nearly as much effect on airfoil lift coefficient as much greater amounts of ice and that glaze ice usually has a more detrimental effect than either rime or mixed ice. LEWICE predictions of ice shapes, in general, compared reasonably well with ice shapes obtained in the IRT, although differences in details of the ice shapes were observed.

SUBJECT TERMS:
Modern airfoils; Ice accretions; Business jet main wing; Aerodynamic performance;
Large transport horizontal tailplane

NUMBER OF PAGES:
15

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1997/TM-107423.pdf
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