并列双方柱的疏水涂层防冰效果结冰风洞实验评估

采用结冰风洞实验研究的方法,利用0.3m×0.2m结冰风洞主实验段,在不同结冰气象条件下对涂覆在并列双方柱实验模型表面的不同纳米疏水涂层结冰特性进行了实验研究,对左右并排的方柱实验模型表面的结冰外形进行了测量和比较,建立了基于9个结冰外形几何特征量的防冰效果量化评估方法,对有、无纳米疏水涂层表面的结冰外形几何特征量无量纲化偏差进行了计算和分析。研究表明:基于结冰外形几何特征量的防冰效果量化评估方法可以较好地评估纳米疏水涂层的防冰效果。与未涂覆防冰涂层的铝合金材料相比,硅橡胶及其添加颗粒的纳米涂层均具有一定的防冰性能,与硅橡胶涂层相比,有的添加颗粒的纳米涂层防冰效果略好一点,而有的略差一点,没有明显提高。在硅橡胶基底材料中添加纳米疏水颗粒,可以在涂层表面构筑一些微纳结构,从而起到防冰作用。因此,在硅橡胶涂层中添加纳米疏水颗粒是一种值得探索的防冰涂层制备研究方向,但如果仅采用物理混合搅拌的方法,纳米颗粒难以在硅橡胶涂层表面形成稳定疏水性能的微纳乳突结构。纳米疏水涂层只能降低结冰速率,无法完全杜绝材料表面的结冰现象。 

Icing wind tunnel test evaluation on anti-icing effects of hydrophobic coating on two parallelized square cylinders

Anti-icing effects of different nano hydrophobic coatings on two parallelized square cylinders test model were studied using icing experimental method in the main test section of 0.3m×0.2m icing wind tunnel under different icing weather conditions.The ice shapes on left and right parallelized square cylinders test model were measured and compared respectively.The quantitative method of evaluating anti-icing effect was established on the basis of nine geometric characteristics parameters of ice profile.The nondimensional deviation of ice profile geometric characteristics parameters were calculated and analyzed between the coated model and the clean model.The study shows that the quantitative test evaluation method based on ice profile geometric characteristics parameters can evaluate the anti-icing effect of nano hydrophobic coating.The silicone rubber coating and other coatings added in different nano particles have some anti-icing capability.The silicone rubber coating added in different proportion of nano particles show comparative anti-icing capability compared with the silicone rubber coating in the present study.Adding small amount of nano hydrophobic particles in the silicone rubber coating can construct some micro-nano structures, which can enhance the hydrophobic and anti-icing effects.Therefore, it is a valuable way to fabricate anti-icing coating by adding different nano hydrophobic particles into the silicone rubber coating.But it is not easy for the nano hydrophobic particles to form a stable micro-nano structures with hydrophobic and anti-icing performance on the silicone rubber coating just by physical mixing and stirring methods.The nano hydrophobic coating can reduce the icing velocity, but cant stop icing phenomena completely.