The invention discloses an air film drag reduction model with a wetting step effect and a preparation method thereof. The air film drag reduction model comprises a model sample, the model sample is composed of a plurality of hydrophilic areas and hydrophobic areas, the hydrophilic areas and the hydrophobic areas are arranged alternately, the hydrophilic areas are shaped like pits, the static contact angle of each hydrophilic area is smaller than 90 degrees, and the static contact angle of each hydrophobic area is smaller than 90 degrees; and the static contact angle of each hydrophobic regionis greater than 150 degrees. A hydrophilic-hydrophobic alternate grid structure is constructed on the surface of the model, a wetting step effect can be generated on the wall surface, and binding force for restraining liquid-gas-solid three-phase contact line movement is generated; according to the scheme, a regular microstructure characteristic morphology is constructed on the surface of a sampleby adopting a laser ablation method, a low-surface-energy substance stearic acid is used for assisting in modification to reduce surface free energy, and a hydrophilic and hydrophobic super-hydrophobic surface is constructed to achieve a drag reduction effect. Compared with the prior art, the method has the advantages of simplicity and feasibility in operation, high processing efficiency, low cost, no harm to the environment and the like.
本发明公开一种具有润湿阶跃效应的气膜减阻模型及其制备方法,包括模型试样,模型试样由多块亲水区域和疏水区域组成,并且每个亲水区域和每个疏水区域呈相间排布,亲水区域形状为凹坑,每个所述亲水区域的静态接触角小于90°,每个所述疏水区域的静态接触角大于150°。通过在模型表面构建亲疏水相间的网格结构,能在壁面产生润湿阶跃效应,产生约束液‑气‑固三相接触线移动的束缚力;本方案采用激光烧蚀的方法在试样表面构建规则微结构特征形貌,辅助以低表面能物质硬脂酸修饰降低表面自由能,构筑亲疏水相间的超疏水表面以达到减阻效果。与现有技术方案相比,本发明操作简单易行,加工效率高、成本低,对环境无危害等优点。
Air film drag reduction model with wetting step effect and preparation method thereof
一种具有润湿阶跃效应的气膜减阻模型及其制备方法
2021-03-26
Patent
Elektronische Ressource
Chinesisch
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