Abstract
A calculation method was developed to analyze the water-film flow on an anti-icing airfoil surface. The mathematical model for the mass and heat transfer of the water-film flow considered two regions: the runback water layer, and the external airflow boundary layer on the anti-icing surface. Both of the airflow boundary and water flow layers were subject to mass, momentum, and energy conservations. The thickness of the water-film flow was predicted. In the water droplet impinging area, the water flowed in the form of water film. Outside the water droplet impinging area, the water film became unstable and then broke up into individual rivulets due to the influence of the aerodynamic shear force and surface properties. The mathematical model of rivulets was presented and used to predict the shape of the rivulets on the airfoil surface. The calculations were compared to the experimental results. The characteristics of the runback water on the anti-icing surface were analyzed.
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