Full Text:   <1162>

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CLC number: TH161.12

On-line Access: 2017-01-03

Received: 2015-12-06

Revision Accepted: 2016-06-02

Crosschecked: 2016-12-19

Cited: 0

Clicked: 1827

Citations:  Bibtex RefMan EndNote GB/T7714


Xiao-wen Song


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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.1 P.59-66


Skin friction reduction characteristics of variable ovoid non-smooth surfaces

Author(s):  Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou

Affiliation(s):  State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   songxw@zju.edu.cn

Key Words:  Variable ovoid dimple, Non-smooth surface, Numerical simulation, Skin friction reduction

Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou. Skin friction reduction characteristics of variable ovoid non-smooth surfaces[J]. Journal of Zhejiang University Science A, 2017, 18(1): 59-66.

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author="Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou",
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%0 Journal Article
%T Skin friction reduction characteristics of variable ovoid non-smooth surfaces
%A Xiao-wen Song
%A Peng-zhe Lin
%A Rui Liu
%A Pei Zhou
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500324

T1 - Skin friction reduction characteristics of variable ovoid non-smooth surfaces
A1 - Xiao-wen Song
A1 - Peng-zhe Lin
A1 - Rui Liu
A1 - Pei Zhou
J0 - Journal of Zhejiang University Science A
VL - 18
IS - 1
SP - 59
EP - 66
%@ 1673-565X
Y1 - 2017
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1500324

The use of bionic non-smooth surfaces is a popular approach for saving energy because of their drag reduction property. Conventional non-smooth structures include riblets and dimples. Inspired by sand dunes, a novel variable ovoid non-smooth structure is proposed in this study. The body of the variable ovoid dimple was designed based on three size parameters, the radius, semimajor, and depth, and a 3D model was created based on UG software. The constructed variable dimples were placed in a rectangular array on the bottom of a square tube model. Following ANSYS meshing, the grid model was imported into FLUENT, where the flow characteristics were calculated. Results of skin friction reduction were achieved and the effect of the design parameters on different variable ovoid dimples was obtained by orthogonal testing. Various aspects of the skin friction reduction mechanism were discussed including the distribution of velocity vectors, variation in boundary layer thickness, and pressure distribution.


创新点:1. 以仿生学理论为基础,提出变异卵圆形凹坑结构模型,突破现有非光滑结构类型的局限; 2. 采用参数构造的方法研究变异卵圆形各构造参数对表面摩擦阻力减阻的影响。
方法:1. 采用半径、半轴和坑深3个尺寸参数对变异卵圆凹坑结构进行几何定义,并将非光滑结构以一定纵向间距按矩形排布布置在仿真模型底部;2. 以3个尺寸参数和纵向间距设计"三水平四因素"正交实验,在不同气流流速下进行数值模拟仿真;3. 通过速度矢量、边界层厚度变化和压力分布研究变异卵圆形凹坑非光滑表面的气动摩擦减阻机理。
结论:1. 变异卵圆形非光滑表面具有一定的气动摩擦减阻效果,和光滑表面相比,在空气来流速度为24 m/s时,有10%的减阻效果;2. 正交实验分析表明,4个试验因素对减阻效果的影响从大到小排列分别为:半径、坑深、半轴和纵向间距;3. 变异卵圆形凹坑表面增加了边界层的厚度,降低了近壁面区域的速度梯度,减少了剪切力,从而起到了减少摩擦阻力的效果。


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