Full Text:   <1162>

Summary:  <315>

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

 ORCID:

Xiao-wen Song

http://orcid.org/0000-0001-6386-9836

-   Go to

Article info.
Open peer comments

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

http://doi.org/10.1631/jzus.A1500324


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.

@article{title="Skin friction reduction characteristics of variable ovoid non-smooth surfaces",
author="Xiao-wen Song, Peng-zhe Lin, Rui Liu, Pei Zhou",
journal="Journal of Zhejiang University Science A",
volume="18",
number="1",
pages="59-66",
year="2017",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1500324"
}

%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
%V 18
%N 1
%P 59-66
%@ 1673-565X
%D 2017
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500324

TY - JOUR
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


Abstract: 
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.

变异卵圆形凹坑非光滑表面的气动摩擦减阻研究

目的:仿生非光滑表面具有降低表面摩擦阻力的作用,传统的非光滑结构有沟槽和凹坑等。本文旨在研究变异卵圆形凹坑非光滑表面的气动摩擦减阻特性及其减阻机理。
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。

关键词:变异卵圆形凹坑;非光滑表面;数值模拟;表面摩擦减阻

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Bixler, G.D., Bhushan, B., 2013. Shark skin inspired low-drag microstructured surfaces in closed channel flow. Journal of Colloid and Interface Science, 393:384-396.

[2]Boiko, A.V., Jung, K.H., Chun, H.H., et al., 2007. Effect of riblets on the streaky structures excited by free stream tip vortices in boundary layer. Journal of Mechanical Science and Technology, 21(1):196-206.

[3]Bourisli, R.I., Al-Sahhaf, A.A., 2008. CFD modeling of turbulent boundary layer flow in passive drag-reducing applications. 7th International Conference on Advances in Fluid Mechanics, p.79-90.

[4]Bullen, R.D., McKenzie, N.L., 2008. The pelage of bats (Chiroptera) and the presence of aerodynamic riblets: the effect on aerodynamic cleanliness. Zoology, 111(4):279-286.

[5]Choi, J., Jeon, W., Choi, H., 2006. Mechanism of drag reduction by dimples on a sphere. Physics of Fluids, 18(4):041702.

[6]Dean, B., Bhushan, B., 2010. Shark-skin surfaces for fluid-drag reduction in turbulent flow: a review. Advance in Mechanics, 368(1929):4775-4806.

[7]Dean, B., Bhushan, B., 2012. The effect of riblets in rectangular duct flow. Applied Surface Science, 258(8):3936-3947.

[8]Gao, G., Huang, N., 1982. Theoretical and experimental study in stability of the barchan dune vortex flame. Journal of Engineering Thermophysics, 3(1):89-95 (in Chinese).

[9]Gu, Y.Q., Zhao, G., Liu, H., et al., 2013. Characteristics of drag reduction of bionic dimpled surface of shell rubber ring of aerodynamic extinguishing cannon. Journal of Jilin University (Engineering and Technology Edition), 43(4):983-990 (in Chinese).

[10]Kim, J., Choi, H., 2014. Aerodynamics of a golf ball with grooves. Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, 228(4):233-241.

[11]Matthews, J.N.A., 2008. Low-drag suit propels swimmers. Physics Today, 61(8):32-33.

[12]Ren, L.Q., 2009. Progress in the bionic study on anti-adhesion and resistance reduction of terrain machines. Science in China Series E: Technological Sciences, 52(2):273-284.

[13]Song, X.W., Zhang, G.G., Wang, Y., et al., 2011. Use of bionic inspired surfaces for aerodynamic drag reduction on motor vehicle body panels. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 12(7):543-551.

[14]Viswanath, P.R., 2002. Aircraft viscous drag reduction using riblets. Progress in Aerospace Sciences, 38(6-7):571-600.

[15]Zhang, C.C., Ren, L.Q., Liu, Q.P., et al., 2008. Experimental study on bionic dimpled surfaces of bodies of revolution for drag reduction. Acta Aerodynamica Sinica, 26(1):79-84 (in Chinese).

[16]Zhang, D.Y., Luo, Y.H., Li, X., et al., 2011. Numerical simulation and experimental study of drag-reducing surface of a real shark skin. Journal of Hydrodynamics, Ser. B, 23(2):204-211.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

Please provide your name, email address and a comment





Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - Journal of Zhejiang University-SCIENCE