Combined Effect of Surface Roughness and Wake Splitter Plate on the Aerodynamic Characteristics of a Circular Cylinder

2017 International Conference on Advanced Technologies in Design, Mechanical and Aeronautical Engineering

工业技术;机械制造;航空航天工程

Saisanthosh, Iyer^1 ; Arunkumar, K.^1 ; Ajithkumar, R.^1 ; Srikrishnan, A.R.^1

Department of Mechanical Engineering, Amrita School of Engineering, Amrita University, Amrita Vishwa Vidyapeetham, Amritapuri, India^1

关键词: Aerodynamic characteristics;    Aerodynamic parameters;    Circumferential location;    Combined effect;    Commercial software;    Lift coefficient;    Numerical investigations;    Substantial reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/234/1/012007/pdf
DOI  :  10.1088/1757-899X/234/1/012007

来源: IOP

【 摘 要 】

This paper is focussed on numerical investigation of flow around a stationary circular cylinder (diameter, D) with selectively applied surface roughness (roughness strips with thickness 'k') in the presence of a wake splitter plate (length, L). The plate leading edge is at a distance of 'G' from the cylinder base. For this study, the commercial software ANSYS Fluent is used. Fluid considered is water. Study was conducted the following cases (a) plain cylinder (b) cylinder with surface roughness (without splitter plate) (c) Cylinder with splitter plate (without surface roughness) and (d) cylinder with both roughness and splitter plate employed. The study Reynolds number (based on D) is 17,000 and k/δ = 1.25 (in all cases). Results indicate that, for cylinder with splitter plate (no roughness), lift coefficient gradually drops till G/D=1.5 further to which it sharply increases. Whereas, drag coefficient and Strouhal number undergoes slight reduction till G/D=1.0 and thereafter, gradually increase. Circumferential location of strip (α) does not influence the aerodynamic parameters significantly. With roughness alone, drag is magnified by about 1.5 times and lift, by about 2.7 times that of the respective values of the smooth cylinder. With splitter plate, for roughness applied at all 'α' values, drag and lift undergoes substantial reduction with the lowest value attained at G/D=1.0.