Water-Film Flowing Control on the Solid Surfaces
摘要
When aircraft flies through supercooled clouds at high altitudes, supercooled droplets are prone to freeze when hitting the aircraft surface. When the supercooled droplets are not completely frozen, or the anti/de-icing system is working, the droplets accumulate on the surface of the machine to form a water film. If the water film fails to detach from the surface in time, overflow will occur and overflow ice will form. The flow area and existence state of the water film also determine the icing range of the overflow ice and the mass distribution of the ice layer, which has a significant impact on the aerodynamic characteristics of the aircraft. This chapter focuses on the influencing factors of water film flow behavior, summarizes the water film flow characteristics, and focuses on the rupture and detachment process of the water film. On this basis, a gradient non-wetting surface was designed and constructed to investigate water film flow characteristics, revealed the mechanism of gradient non-wetting surfaces controlling water film flow, and established an empirical prediction model for water film thickness.