An Explorative Study to Use Super-Hydrophilic/Super-Hydrophobic Hybrid Surfaces for Aircraft Icing Mitigation 2019-01-1995
Aircraft icing is widely recognized as one of the most severe hazards to aircraft operating in cold weather. In the present study, a novel hybrid anti-/de-icing strategy, i.e., by combining an electric heating film coated with super-hydrophilic coatings near the airfoil leading edge and a super-hydrophobic coating to cover the rest of the airfoil surface, was explored for aircraft icing mitigation, in comparison with the method to cover bother electric heating film and the airfoil surface only with a super-hydrophobic surface coating. While a comprehensive experimental study was conducted to examine the characteristics of dynamic droplet impingement onto solid surfaces with different wettability used for the hybrid approach, a NACA0012 airfoil/wing model implemented with two different hybrid methods was installed in the Icing Research Tunnel at Iowa State University (i.e., ISU-IRT) for the anti-/de-icing experiments. It was found that, the supercooled water droplets continued spreading without receding and bouncing after impacting onto the super-hydrophilic surface, the wetting area for the super-hydrophilic surface was found to be about five times larger than those over the super-hydrophobic surface. The super-hydrophilic coating on the heating film would cause a more uniform water film distribution over the heated surface near the airfoil leading edge, resulting in an improved thermal efficiency for the anti-/de-icing operation.
Haiyang Hu, Hui Hu, Yang Liu
Iowa State University
International Conference on Icing of Aircraft, Engines, and Structures