A common phenomenon that may be observed during an aircraft operation is the formation of an on-ground cold soak fuel frost (CSFF), following a landing. This frost formation occurs as integral tanks located on an aircraft’s wings are subjected to low temperatures for a prolonged period typically at high altitude, which allows the fuel to reach low temperatures. If at the landing airport, the aircraft is exposed to a high-humidity ambient CSFF may occur. This sequence of events allow the water to desublimate into ice and to build up onto the wing surface. This frost formation, depending of its extend, may affect the aircraft performance, affecting safety or the aircraft dispatchability. In this paper a cold soak fuel frost modeling for an aircraft wing tank is presented. Numerical prediction are compared with experimental data and qualitative verification for the frost formation and decay during a landing is presented. The numerical simulation showed good agreement between experimental observation and modeling. In addition, an in-flight evaluation was performed where two frost formations, obtained with a Monte Carlo method, was defined and represented by different grit types.
Daniel Martins da Silva, Luis Santos, André Katchborian, Rodrigo Sousa
International Conference on Icing of Aircraft, Engines, and Structures