脊状表面的加工成型技术及其减阻试验研究

Machining Molding Technology of Riblet Surface and Experimental Study on Drag Reduction

为了研究脊状表面的减阻特性,采用数控加工技术在有机玻璃平板上制备脊状表面。在制备过程中,成功解决了脊状结构尺寸的确定、材料的选择、表面粗糙度的提高等问题。利用热线风速仪在低速风洞中分别对光滑表面和多个脊状表面进行了流场测试,获得了湍流边界层内流动参数的分布情况。试验结果表明,脊状表面改变了边界层内的流场结构,抑制了湍流脉动,降低了湍流强度,导致了减阻效果。同时,采用数控加工技术在有机玻璃平板上制备脊状表面的方法是可行的。

In order to study drag reduction characteristic of riblet surface,riblet surface on plexiglass flat is manufactured by using computerized numerical control(CNC) machining technology.In the preparation,some questions,such as confirmation of size,choice of material and improvement of surface finish are solves successfully.Field flow about smooth and different riblet surfaces have been tested separately in low speed wind tunnel by hotwire anemometry and distribution of turbulent boundary layer flow parameters is obtained.Experimental results show that riblet surface changes field flow structure of boundary layer,restrains turbulent variance,decrease turbulence intensity,brings on drag reduction effect.Preparation of riblet surface by using CNC machining technology is feasible.