Experimental Study of Unsteady Heat Transfer and Phase Changing Process Upon Impacting of Ice Crystals onto Heated Surfaces Pertinent to Aero-Engine Icing Phenomena

Ice accretion on exposed surfaces of aero-engine components has been widely recognized as a significant hazard to aviation safety in cold weathers. Icing process due the impingement supercooled water droplets suspended cloud onto inlet aeroengines have studied extensively for decades. Since ice particles were believed simply bounce off from components, crystals clouds initially considered not pose threat safety. Therefore, impacting hot engine componentes until recently. It found recently that, tiny may be partial/full melting upon such heated Inlet Guide Vanes (IGV) and various probes. The partially/fully melted stick form thin film, which would intercept more oncoming lead over components. crystal induced accumulation critical cause performance loss erroneous data being read In present study, series experimental investigations conducted elucidate underlying physics dynamic pertinent icing phenomena. A novel test rig with capacity generating controllable amount flying speed up 100 m/s was developed temperature-controllable environment chamber studies. By using high-speed imaging system, digital particle image velocimetry(PIV), an Infrared (IR) thermal comprehensive campaign performed characterize transient crystals, unsteady heat transfer associated surfaces, comparison those droplets. ultra-sensitive force sensor comparative study is examine differences impinging dynamics single droplets, solid different wettability stiffness. upgrading unique Research Tunnel Iowa State University (i.e., ISU-IRT) additional capability, set explorative studies are also characteristics processes Vane model under both droplet conditions. anti-/de-icing hybrid strategy by integrating icephobic coatings minimized surface heating evaluated new findings derived very helpful gain further insights into phenomena development effective robust strategies ensure safer efficient aircraft/aero-engine operations