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Circular cylinder vortex-synchronization control with a synthetic jet positioned at the rear stagnation point

Published online by Cambridge University Press:  25 August 2010

LI HAO FENG  and
JIN JUN WANG
LI HAO FENG
Affiliation:
Fluid Mechanics Institute, Beijing University of Aeronautics and Astronautics and Fluid Mechanics Key Laboratory of Education Ministry, Beijing 100191, China
JIN JUN WANG*
Affiliation:
Fluid Mechanics Institute, Beijing University of Aeronautics and Astronautics and Fluid Mechanics Key Laboratory of Education Ministry, Beijing 100191, China
*
†Email address for correspondence: jjwang@buaa.edu.cn
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Abstract

The flow over a circular cylinder controlled by a two-dimensional synthetic jet positioned at the mean rear stagnation point has been experimentally investigated in a water channel at the cylinder Reynolds number Re = 950. This is an innovative arrangement and the particle-image-velocimetry measurement indicates that it can lead to a novel and interesting phenomenon. The synthetic-jet vortex pairs induced near the exit convect downstream and interact with the vorticity shear layers behind both sides of the cylinder, resulting in the formation of new induced wake vortices. The present vortex synchronization occurs when the excitation frequency of the synthetic jet is between 1.67 and 5.00 times the natural shedding frequency at the dimensionless stroke length 99.5. However, it is suggested that the strength of the synthetic-jet vortex pair plays a more essential role in the occurrence of vortex synchronization than the excitation frequency. In addition, the wake-vortex shedding is converted into a symmetric mode from its original antisymmetric mode. The symmetric shedding mode weakens the interaction between the upper and lower wake vortices, resulting in a decrease in the turbulent kinetic energy produced by them. It also has a significant influence on the global flow field, including the velocity fluctuations, Reynolds stresses and flow topology. However, their distributions are still dominated by the large-scale coherent structures.

JFM classification

Turbulent Flows: Turbulence control Vortex Flows: Vortex interactions Vortex Flows: Vortex shedding
Type
Papers
Information
Journal of Fluid Mechanics , Volume 662 , 10 November 2010 , pp. 232 - 259
Copyright
Copyright © Cambridge University Press 2010

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