表面微结构的尺寸参数对其减阻性能的影响  

Effect of the Surface Microstructure Size Parameters on Its Drag Reduction Performance

作　　者：郭飞飞 王珂心 苏慧明 杨轶飞 秦立果[2] GUO Feifei;WANG Kexin;SU Huiming;YANG Yifei;QIN Liguo(School of Mechanical and Electrical Engineering,Xi'an Polytechnic University,Xi'an 710048,China;Institute of Design Science and Basic Components,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安工程大学,机电工程学院,西安安710048 [2]西安交通大学,设计科学与基础部件研究所,西安710049

出　　处：《机械设计与研究》2023年第1期112-117,共6页Machine Design And Research

基　　金：中国纺织工业联合会科技指导项目(2021070);陕西省教育厅基础研究项目(21JK0659)。

摘　　要：为了研究微结构尺寸参数对减阻性能的影响规律,构建了V形、L形及T形三种微结构有限元模型,采用Fluent软件进行数值模拟,分析微结构尺寸参数(高宽比、数量和间距)对减阻率、速度和涡量的影响。结果相较于L形、T形微结构,V形微结构的减阻性能较优,减阻率可达15.6%。当V形微结构高宽比为1∶1,流体域速度为6 m/s时,减阻效果最优,减阻率可达5%;V形微结构展向数量对减阻性能的影响较小,减阻率在14%-16%之间变化;当间距值为0.05时,减阻率最大为14%。结论微结构使得近壁区边界层内发生了湍流猝发现象,外部高速流体与壁面区域的流体分隔开,变相的增加了边界层的厚度。同时涡量集中在微结构尖端处,减弱反向旋涡的强度,抑制了低速条带的形成和发展。The influence of microstructure size parameters on the drag reduction performance is studied.Three microstructure finite element models,V-shaped,L-shaped and T-shaped,are constructed and numerical simulations are carried out using Fluent software to analyze the effects of microstructure size parameters(e.g.aspect ratio,number and spacing)on drag reduction rate,velocity and vorticity.Compared with the L-shaped and T-shaped microstructures,the V-shaped microstructure shows better drag reduction performance,and the highest drag reduction rate could reach 15.6%.When the aspect ratio of the V-shaped microstructure is 1:1 and the fluid domain velocity is 6 m/s,the drag reduction effect is optimal and the drag reduction rate is up to 5%;the number of V-shaped microstructure spreading has less influence on the drag reduction performance and the drag reduction rate varies between 14%and 16%;when the spacing value is 0.05,the maximum drag reduction rate is 14%.The microstructure induces the turbulent burst phenomenon in the boundary layer near the wall area,which separates the external high-speed fluid from the fluid in the wall area,and increases the thickness of the boundary layer in a disguised form.It weakens the strength of the reverse vortex and inhibits the formation and development of low-speed strips.

关 键 词：表面微结构 数值模拟 减阻性能 减阻机理 

分 类 号：TH117[机械工程—机械设计及理论]