Ice Accretions and Icing Effects for Modern Airfoils

• Main Author: Addy Jr, Harold E
• Format: Report
• Language: English
• Subjects: ADVERSE CONDITIONS; AERODYNAMIC CHARACTERISTICS; AERODYNAMIC CONTROL SURFACES; Aerodynamics; COMMERCIAL AIRCRAFT; Commercial and General Aviation; GENERAL AVIATION AIRCRAFT; ICE FORMATION; ICE MECHANICS; PERFORMANCE(ENGINEERING); Snow, Ice and Permafrost; TURBULENCE; TWO DIMENSIONAL; WIND TUNNEL TESTS

Icing tests were conducted to document ice shapes formed on three different two-dimensional airfoils and to study the effects of the accreted ice on aerodynamic performance. The models tested were representative of airfoil designs in current use for commercial transport, business jet, and general aviation aircraft. The models were subjected to a range of icing conditions in an icing wind tunnel. The conditions were selected primarily from the Federal Aviation Administration's Federal Aviation Regulations 25 Appendix C atmospheric icing conditions. A few examples of supercooled large droplet icing conditions were included. To verify the aerodynamic performance measurements, molds were made of selected ice shapes formed in the icing tunnel. Castings of the ice were made and placed on a model in a dry low-turbulence wind tunnel, and precision aerodynamic performance measurements were taken. Documentation is included in this report of all ice shapes produced and the aerodynamic performance measurements made during the icing tunnel tests. Results from the dry low-turbulence wind tunnel tests are also presented.