Control effects of the flow and the aerodynamic force around the downstream cylinder by a spinning upstream cylinder in uniform flow

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 22, Issue 3, 1998, pp.346-359
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.1998.22.3.346

Title & Authors

Control effects of the flow and the aerodynamic force around the downstream cylinder by a spinning upstream cylinder in uniform flow

Bu, Jeong-Suk; Yang, Jong-Pil; Kim, Chang-Su; Sin, Yeong-Gon;

Bu, Jeong-Suk; Yang, Jong-Pil; Kim, Chang-Su; Sin, Yeong-Gon;

Abstract

The aerodynamic forces and wake structure of the non-rotating downstream circular cylinder, of which the uniform freestream flow is interfered with another spinning upstream cylinder having the same diameter that is located upstream in a line have been investigated experimentally. When the spin rate of the downstream cylinder defined as the ratio of tangential surface velocity of the spinning cylinder to the freestream velocity increases gradually from zero to 1.4, the change of surface pressure distribution, aerodynamic forces of the non-rotating downstream cylinder were measured in case of several distance ratios of 1.5, 3.0, and 4.5 defined as the ratio of distance between the centers of two cylinders to the diameter. The wake flow patterns behind the cylinder were also investigated in each case. From the present experiments, it has been found that the spin rate significantly influences the aerodynamic forces and near-wake flow phenomena of the downstream cylinder in such a way that the drag increases as the spin rate and distance ratio increase and the wake width increases as the distance ratio increases.

Keywords

Spinning Circular Cylinder;Aerodynamic Force;Spin Rate;Strouhal Number;Pressure Distributions;Flow Patterns;

Language

Korean

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