抑制撞击液滴的结冰在实际工程应用中具有重要意义。目前常用的防结冰方法存在能耗高、防冰时间短、不能从源头上抑制结冰等缺点。利用撞击液滴的反弹特性抑制结冰是一种新思路，可从根本上解决撞击液滴结冰问题。本项目将基于这种新思路，以“利用撞击液滴的反弹特性抑制结冰”为研究目标，围绕“疏水/超疏水冷表面上弹跳液滴动力学过程和热力学过程的耦合机制及结冰机理”这一科学问题开展研究，通过实验测试、数值模拟和理论分析，首先建立接触时间和成核/再辉时间与撞击韦伯数、雷诺数、表面浸润性以及过冷度之间的标度关系，给出撞击液滴结冰的理论判据；针对冰晶成核/再辉时间小于或接近接触时间的条件，阐明液滴撞击冷表面的动力学过程和结冰过程的耦合机制，揭示抑制撞击液滴结冰的机理；在此基础上，提出降低接触时间、增加成核/再辉时间的新方法，从而为“利用撞击液滴的反弹特性抑制结冰”提供理论基础和技术支撑。

It is very important to inhibit freezing of droplets impinging on substrates in practical engineering application. At present, the commonly used anti-icing methods have many disadvantages, such as high energy consumption, short anti-icing time, and unable to inhibit freezing at the source. Inhibiting freezing by using the bouncing characteristic of impinged droplets is a new idea, which can suppress ice formation at the source. Based on this new idea, the objective of this project is to inhibit freezing by using the bouncing characteristic of droplets. One main scientific issue will be investigated, i.e., reveal the coupling mechanisms of dynamic process and freezing process, as well as the freezing mechanism for droplets impacting hydrophobic/superhydrophobic cold substrates. By experimental, numerical studies, and theoretical, we will firstly develop the scale relationship of contact time and nucleation/recalescence time with impact Weber number, Reynolds number, surface wettabilities and supercooling, and then give the theoretical criterion of freezing for the impinged droplets. In view of the condition that the nucleation/recalescence time is less than or close to the contact time, we will illuminate the coupling mechanisms between the dynamic process and freezing process and reveal the inhibiting freezing mechanism of droplets impinging on the cold substrates. Based on the above research, we will also propose new methods to reduce the contact time and increase the nucleation/recalescence time. The implementation of this project will provide a theoretical basis and technical support for inhibiting freezing by using the bouncing characteristic of impinged droplets.