Journal of Thermal Science Vol.23, No.5 (2014) 432437 Received: July 2014 Makoto Yamamoto: Professor www.springerlink.com DOI: 10.1007/s11630-014-0726-2 Article ID: 1003-2169(2014)05-0432-06 Numerical Investigation on Super-cooled Large Droplet Icing of Fan Rotor Blade in Jet Engine Keisuke Isobe 1 , Masaya Suzuki 2 , Makoto Yamamoto 3 1. Graduate School of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan 2. Aviation Program Group, Japan Aerospace Exploration Agency (JAXA), 7-44-1 Jindaiji Higashi-machi, Chofu-shi, Tokyo, 182-8522, Japan 3. Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan © Science Press and Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2014 Icing (or ice accretion) is a phenomenon in which super-cooled water droplets impinge and accrete on a body. It is well known that ice accretion on blades and vanes leads to performance degradation and has caused severe ac- cidents. Although various anti-icing and deicing systems have been developed, such accidents still occur. There- fore, it is important to clarify the phenomenon of ice accretion on an aircraft and in a jet engine. However, flight tests for ice accretion are very expensive, and in the wind tunnel it is difficult to reproduce all climate conditions where ice accretion can occur. Therefore, it is expected that computational fluid dynamics (CFD), which can es- timate ice accretion in various climate conditions, will be a useful way to predict and understand the ice accretion phenomenon. On the other hand, although the icing caused by super-cooled large droplets (SLD) is very danger- ous, the numerical method has not been established yet. This is why SLD icing is characterized by splash and bounce phenomena of droplets and they are very complex in nature. In the present study, we develop an ice ac- cretion code considering the splash and bounce phenomena to predict SLD icing, and the code is applied to a fan rotor blade. The numerical results with and without the SLD icing model are compared. Through this study, the influence of the SLD icing model is numerically clarified. Keywords: Ice Accretion, Fan Rotor Blade, Super-cooled Large Droplet, Multi-physics Simulation Introduction Icing (or ice accretion) is a phenomenon where super- cooled water droplets impinge and accrete on a body. Ice accretion occurs on airplanes, windmills, electric lines at cold districts and so on. It has caused various accidents, especially in the air transport. One of the most notable accidents is Air Florida Flight 90, a Boeing 737 that crashed just after take-off in a blizzard on January 13th, 1982. This caused 78 deaths. Another instance of a crash in flight due to ice accretion occurred on October 31st, 1994. This was American Eagle Flight 4184. This ATR- 72-212, a twin turboprop airliner, was in a holding pat- tern around Chicago O’Hare International Airport be- cause of weather delays. While holding, it endured free- zing rain, a condition where super-cooled water droplets