液滴撞击结冰机理研究进展

Research progress of icing on droplet impinging

  • 摘要: 通过飞机结冰问题引出对液滴撞击固体表面结冰现象的探讨,分别对静置液滴结冰、室温液滴撞击以及两者时空耦合的液滴撞击结冰动力学问题展开研究,分析了部分关键参数的作用机制。研究指出,液滴冻结前后的形状变化、液滴间的相互作用以及冻结触发的动力学行为均对结冰结果有重要影响。通过研究液滴撞击结冰动力学的影响因素,对比了室温液滴和过冷液滴的结冰现象,指出两者在初期热物性、传热机理和相变模式上存在差异,具体表现在成核时间、冰晶类型、界面传热特征、界面推移速度等动力学行为以及冰滴形貌上。最后,总结了撞击速度、液滴粒径及表面润湿度对液滴撞击固体表面结冰的影响。

     

    Abstract: Icing in the form of impinging supercooled droplets accounts for the most cases of aircraft icing. This review provides an in-depth discussion over single sessile droplet icing, impinging of a droplet, and the combined icing of an impinging droplet. Special focus is placed on icing of an impinging supercooled large droplet, which is of significant importance in the study of aircraft icing. The effects of a few key parameters, such as the impinging speed and droplet size, are studied and analyzed. Meanwhile, by studying the factors influencing the dynamics of droplet impact icing, the icing phenomena of room temperature droplets and supercooled droplets are investigated, and it turns out that the initial thermophysical properties, heat transfer mechanisms and phase transition modes vary drastically, and the kinetic behaviors such as nucleation time, ice crystal type, interfacial heat transfer characteristics and phase advancing velocity as well as the droplet morphology are significantly different. The effects of the impact velocity, particle size and surface wetting on droplet impact icing are indicated, providing a theoretical basis and reference for the design and development of anti-deicing technology for aircraft.

     

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