水平表面气流剪切作用下的水膜厚度

doi:10.7527/S1000-6893.2016.0275

Abstract

Abstract:

Liquid water on the surface of aircraft will run back under the effect of the airflow, resulting in redistribution of ice accretion and anti-icing heat flux. Experimental measurement and modeling analysis are conducted to investigate the flow behavior of shear-driven water film on the horizontal flat substrate. The water flow film is driven in a wind tunnel, and the instantaneous thickness is measured in the same location using a laser focus displacement meter based on confocal chromatic technique. It is found that the interface between the gas and liquid phases consists of underlying thin film and multiple scale fluctuations. The variation relationship of the film thickness between the wind speed and film Reynolds number is also obtained. Results show that the average film thickness depends monotonically on these two factors. Based on film flow model and experimental data, a new correlation for calculating the air shear stress above a thin film is proposed and validated by comparison with previous studies. The correlation can be applied for water film thickness calculation over a range of wind speed (17.8-52.2 m/s) and water film Reynolds number (26-128).

Key words: aircraft anti-icing, two-phase flow, water film thickness, interfacial shear stress, modeling

CLC Number:

V211
O359.1

LENG Mengyao, CHANG Shinan, DING Liang, LI Xiaofeng. Thickness of water film driven by gas stream on horizontal plane[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(2): 520696-520704.

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Thickness of water film driven by gas stream on horizontal plane

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