超疏水电热薄膜对溢流冰的抑制效果探究

Inhibition of Runback Ice Via Superhydrophobic Electrothermal Film

溢流冰会对飞行安全与操纵品质造成重大影响。本文将电热方法与超疏水表面法二者结合,探究超疏水电热薄膜对溢流冰的抑制效果。以聚酰亚胺为基底,制备了超疏水电热薄膜,进行了润湿性能测试,证明制得的薄膜具有良好的超疏水性。对超疏水电热薄膜进行了冰风洞试验验证,证明了超疏水电热薄膜在多种结冰环境下对溢流冰均有明显抑制作用。通过分析液滴与薄膜表面的微观接触界面对液滴脱离表面能量的影响,探究了超疏水表面抑制溢流冰的原理。超疏水表面微纳结构凸起的存在,使得液滴与薄膜间的实际接触面积大大减小,从超疏水电热薄膜表面分离液滴所需的能量远远小于普通电热薄膜表面。综上,超疏水表面在防止溢流冰方面表现出显著的优势,在飞机防冰领域具有潜在应用前景。

The runback ice has a significant impact on flight safety and handling quality.In this paper,the electro thermal method and superhydrophobic surface method were combined to explore the inhibitory effect of superhydrophobic electrothermal film on the runback ice.Superhydrophobic electrothermal films were prepared with polyimide as substrate.The wettability test shows that the prepared films has good superhydrophobic properties.The ice wind tunnel test on the superhydrophobic electrothermal film proves that the superhydrophobic electrothermal film has obvious inhibitory effect on the runback ice under various freezing conditions.The mechanism of superhydrophobic surface inhibiting runback ice was explored by analyzing the influence of micro contact interface between droplet and film surface on droplet detachment energy.The actual contact area between the droplet and the film is greatly reduced due to the presence of micro-nano structure on the superhydrophobic surface,and the energy required to remove the droplet from the surface of the superhydrophobic electrothermal film is far less than that of the ordinary electrothermal film surface.In conclusion,the superhydrophobic surface has a significant advantage in preventing the runback ice,and has a potential application prospect in the field of aircraft anti-icing.