Flow around a rotating circular cylinder near a moving plane wall

Abstract

The flow around a rotating circular cylinder, which is placed near a moving plane wall, is investigated experimentally for high Reynolds number (Re=33 000). The cylinder spanned the test section of a wind tunnel and was aligned with its axis parallel to the under wall of the test section and normal to a uniform flow. The wall of the test section under the cylinder was moved at the same speed as the uniform flow. Surface pressure measurements, velocity surveys and flow visualizations suggest the existence of three flow patterns in the near wake behind the cylinder by the change of the gap between the cylinder and the moving wall. The wake from the cylinder is characterized by the behavior of a jet passing through the gap. Furthermore, the behavior of the jet is sensitive to both the centrifugal force generated by the rotating cylinder and the inertial force of the jet.