一维短沟槽复合准晶结构减阻效应及模拟分析  

Mechanism analysis of one-dimensional short groove quasicrystal structure drag-reduction

作　　者：张盟[1] 耿兴国[1] 张瑶[1] 王晓娜[1] 

机构地区：[1]西北工业大学理学院,西安710072

出　　处：《物理学报》2012年第19期287-293,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10872172);西北工业大学研究生创业种子基金(批准号:z2012234).资助的课题~~

摘　　要：本文测试了人工构建的一维短沟槽复合准晶结构对流体的减阻性能,并与一维短沟槽复合周期结构和一维沟槽周期结构的流阻进行了对比.实验结果表明,一维短沟槽复合准晶结构的减阻效果优于一维短沟槽复合周期结构,其中一维短沟槽十二重复合准晶结构的减阻效果最佳,同时与一维沟槽周期结构具有同样的减阻效果.在机理分析方面,建立了二维光栅的夫琅禾费衍射波模型,对通过一维短沟槽复合准晶结构的波谱特征进行模拟分析.频谱分析表明,经过二维准周期光栅的相干波强度谱具有谱带结构特征,抑制了大角度方向上的强峰形成.这一结果与流体流过一维短沟槽复合准晶结构相对应,展向上的准周期结构在激活边界层微扰动的同时,也使得二次涡分布比较均匀,从而抑制了展向强扰动的形成,所以能够有效减小流阻.Short groove arranged in one-dimensional quasicrystal structure is designed by mechanical method in this paper and drag reduc- tion experiments are performed by viscometer. The results show that there is a novel drag reduction effect compared with periodic structure of one-dimensional short groove, in which 12-fold quasicrystal structure of one-dimensional short groove has the best drag reduction, and has an equal effect compared with one-dimensional periodic groove structure. An two-dimensional grating model is proposed to investigate the mechanism. It is found that in comparison with two-dimensional periodic grating, the intensity spectrum of coherent wave passing through two-dimensional quasiperiodic grating has several characteristic structure factors. Corresponding to the quasicrystal structures of one-dimensional short groove, the quasiperiodic structure in spanwise direction can activate little disturbance on boundary layer and make the secondary vortex more uniform, which restrains the strong disturbance in spanwise, consequently reducing the drag.

关 键 词：一维短沟槽复合准晶结构 流体减阻 二维光栅模型 谱带结构 

分 类 号：O753.3[理学—晶体学]