根据鸟类飞羽/尾羽表面的沟槽形貌特征，采用轮毂热压工艺制备一种仿生沟槽薄膜，经风洞实验证实仿生薄膜具有显著的减小表面摩擦阻力的作用。本文通过建立数值模型对比光滑表面和沟槽表面对表面摩擦阻力的影响，揭示了沟槽内诱发的微漩涡是导致仿生薄膜减阻的主要原因，并分析了壁面剪切率和压力分布随流场马赫数的变化规律。结果表明，粘性摩擦阻力的降低和压差阻力的增大是影响仿生沟槽薄膜减阻效果的一对矛盾关系，通过沟槽形貌特征的优化抑制压差阻力的增加可显著提高仿生薄膜的减阻效果。
Based on the riblet geometry of bird flight feather or tail feather,a kind of film with rule micron-scale riblets was manufactured using hot wheel pressing technique and significant drag reduction was obtained through wind tunnel tests.In this paper,effect of smooth surface and riblet surface on skin friction was studied through establishing numerical model and revealed that the microvertex induced inside the riblets was the main factor resulting in the drag reduction effect of bionic film which changed along with the wall shear stress and pressure distribution.Results indicated:it was a contradiction relationship between the reduced viscous friction and the increased pressure drag affecting the skin friction reduction of bionic film.But,we achieved the mini-mum pressure drag and maximum drag reduction through the optimized riblet geometry.
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