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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

STUDY ON MICROSTRUCTURE EVOLUTION CHARACTERISTICS OF AIRCRAFT ICING BASED ON PHASE-FILED METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.cms.023142
pages 1957-1964

摘要

The in-flight accretion of ice on aerodynamic surfaces presents a significant threat to the safety and performance of aircraft. The icing conditions has not only significant influence on the macroscopic morphology, physical and mechanical properties of the ice, but also has great influence on the microstructure of icing characteristics, and there is a close relationship between the microstructure and the macroscopic appearance. Focusing on the microstructures characteristics of icing process, a phase-field model is proposed for simulating the crystallization of supercooled water, and the influence of degree of supercooling on crystal growth is investigated in this work. Based on the combination of wind tunnel experiment and microscopic image recognition, the relationship between the supercooling and nucleation rate of icing process is obtained. Based on the phase-field method, the numerical simulation method for the prediction of microstructure characteristics of aircraft icing is developed, and the microstructural evolution characteristics of icing under different supercooling conditions are analyzed. The results indicate that the proposed phase-field method can predict the crystallization under supercooled conditions effectively. The crystal growth rate, the microstructures characteristics, and the nucleation density is strongly dependent on the supercooling of water droplets. With the increase of supercooling, the nucleation density increases and the crystal grains will become smaller and vice versa. In order to understand the evolution mechanism of icing, it is of great significance to study the inherent causes of ice formation and to develop the fine prediction method for aircraft icing.