人工构建二维准晶复合结构的减阻特性研究

Drag-reduction property of composite structure surface with planar quasicrystal

采用旋转锥板式剪切力测试系统,测试了人工构建的具有五次、八次、十次、十二次对称性的二维准晶结构对甘油和水混合液的减阻性能,并与随机排列结构和周期排列结构的流阻进行了对比.对比试验发现:准晶结构具有显著的减阻效果,其中具有十二次对称性的二维准晶结构减阻效应最大,在剪切率为200—2000s-1时,剪切力减小的幅度从15%—9%,其最大减阻量可达到15.4%.进一步在所构建的大尺度二维准晶结构的表面,再复合制备微/纳米粗糙结构,这两种尺度的结构协和作用,可实现减阻效果明显提高.

We built the quasicrystal structures which are five-fold,eight-fold,ten-fold and twelve-fold rotational symmetric artificially,and measured their drag-reduction in the mixed solution of water and glycerin by viscometer.We found the twelvefold symmetric structure has a drag-reduction of 15%—9% when shear rate is 200—2000s -1.The drag-reduction can be much greater when the structure is compounded with rough surface consisting of micro/nano-structures.