https://doi.org/10.1140/epjp/i2019-12508-3
Regular Article
Features of the flow over a rotating circular cylinder at different spin ratios and Reynolds numbers: Experimental and numerical study
1
Department of Mechanical Engineering, Semnan University, Semnan, Iran
2
Department of Mechanical Engineering, Islamic Azad University South Tehran Branch, Tehran, Iran
3
Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran
* e-mail: M.J.EzadiYazdi@semnan.ac.ir
Received:
25
October
2018
Accepted:
11
January
2019
Published online:
6
May
2019
In this study, the characteristics of the flow in a rotating circular cylinder are investigated experimentally and numerically. The hot-wire anemometry is used to measure the mean velocity and turbulent intensity of the flow, also the k-
SST model is used to extract the numerical results. The diameter of the cylinder is considered to be 20mm. The effect of Reynolds number 
in the range of 
and the spin ratio (
) in the range of 
on the characteristics of the flow wake such as time-averaged velocity, turbulence intensity, higher-order central moments of the hot-wire velocity signals (i.e. skewness factor), Strouhal number, drag coefficient and flow pattern have been investigated. According to the experimental results, the cylinder rotation has led to change in the mean and fluctuation velocity profiles and the velocity reduction region has become smaller by increasing the Reynolds number. Furthermore, the symmetry of the flow is broken as the rotation ratio increases. Also, by increasing the rotation ratio, the positions of the stagnation and separation points are changed. It is found that with increasing the rotation ratio, the drag coefficient and the velocity reduction parameters are decreased.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
