An Experimental Investigation of the Separation Points on a Circular Rotating Cylinder in Cross Flow

[+] Author and Article Information
L. Labraga, G. Kahissim, L. Keirsbulck, F. Beaubert

Laboratoire de Mécanique des Fluides et d’Energétique, Université de Valenciennes, 59304 Valenciennes, France

J. Fluids Eng 129(9), 1203-1211 (Mar 05, 2007) (9 pages) doi:10.1115/1.2746894 History: Received June 30, 2005; Revised March 05, 2007

The flow past a rotating cylinder placed within a uniform stream is investigated at Reynolds numbers ranging from 8500 to 17,000 to 34,000. The dimensionless rotation rate α (ratio of the cylinder peripheral speed to the free-stream velocity) varies from 0 to 7. The experimental investigation is based on laser-Doppler anemometry measurements and particle-image velocimetry (PIV) within a water channel. The analysis of the experimental results mainly concerns the location of the separation points as defined by various criteria. It is found that the criterion suggested by Moore, Rott and Sears (MRS) is met in the case of the downstream-moving walls. Moreover, this study shows that sufficient information was obtained to confirm that the MRS criterion is still valid even in the case of the upstream-moving walls. This is confirmed by the behavior of the vertical velocity component educed from the averaged two-dimensional flow field obtained by PIV measurements.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 4

Measured velocity profiles by LDA around the separation point for a downstream-moving wall at Re=34,000 (uncertainty in uθ∕u0: ±2%)

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Figure 10

Patterns of mean streamlines and mean flow for the upstream-moving wall for Re=8500 (velocity (m/s))

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Figure 11

Radial velocity component nondimensionalized with respect to the maximum value for Re=17,000

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Figure 12

Position of the separation points on the upstream-moving wall

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Figure 13

The vorticity field for Re=8500, (a) downstream-moving wall region and (b) upstream-moving wall region

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Figure 14

Variation of mean vorticity (≈4mm from the surface of the cylinder) at different Reynolds numbers and for various α

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Figure 1

Sketch of the cylinder in (a) the test section (b) and the coordinate system

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Figure 2

Power spectra of the tangential velocity fluctuations for different α

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Figure 3

Variation of the Strouhal number with α

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Figure 5

Mean flow field (downstream-moving wall) for Re=17,000 (velocity (m/s))

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Figure 6

(a) Tangential velocity for α=0, θ=30°, and θ=60° (uncertainty in uθ∕u0 estimated at about ±2%). (b) Radial velocity for α=0.5 at θ=90° (uncertainty in ur∕u0 estimated at about ±2%).

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Figure 7

Radial velocity component nondimensionalized with respect to the maximum value

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Figure 8

Evolution of the separation point with α for different Re

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Figure 9

LDA measurements of velocity profiles around the separation point for an upstream-moving wall (uncertainty in uθ∕u0: ±2%)




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