Abstract
Icing phenomena are one of the hot issues in the aviation field, which has attracted the attention of many manufacturers. The physical process of water film flow determines the position and amount of icing. In this paper, the flow process of water film on a rough surface is studied. An experimental platform was built in a wind tunnel, and the digital image processing (DIP) technology was used to measure the water film flow. The water film flow under different roughness conditions of the plate was obtained in the experiments. The correction model of interfacial shear coefficient is established, and the influence of roughness on water film flow is deduced. The relationship obtained in this paper can provide data support for the study of gas-water coupled flows on rough surfaces.
Highlights
Aerospace 2021, 8, 225. https://Icing on the surface of aircraft seriously affects flight safety [1]
The plates with different roughness were respectively installed on the water film test table, and water film flow tests was performed using the digital image processing (DIP) water film measurement method, and the measurement results were analyzed
A series of water film experiments were performed on different roughness surfaces using a developed DIP system
Summary
Icing on the surface of aircraft seriously affects flight safety [1]. When the aircraft passes through clouds, the supercooled droplets in the clouds hit the windward side of the aircraft and freeze rapidly [2]. To study the influence of surface roughness on water film flow can further improve the numerical simulation accuracy of glaze ice. Rothmayer et al [7,8] established the boundary layer theory to describe the evolution of the liquid film surface. Based on the theory of boundary layer with high Reynolds number, Wang et al [9] established a small-scale surface roughness water film transport model These studies strengthened the theoretical understanding of the water film flow. Based on the theory of high Reynolds number boundary layer, several properties of viscosity-dominated liquid film flow were studied, including the flow and heat transfer process of water film in rough field, the movement process of droplets, and the stream phenomenon caused by the surface instability of two-dimensional water film. This method has certain guiding significance for improving the ice numerical simulation accuracy of glaze ice
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