Abstract
Active control of the flow around a circular cylinder using a synthetic jet (SJ) array was experimentally investigated in a small wind tunnel. The prevailing method was flow visualization. Modification of the wake was investigated at two values of a dimensionless momentum coefficient (Cμ = 0.21 and 1.02). Various α and C f parameters were tested (where α is the angle between SJs and the main flow direction and C f is the frequency ratio). It was found that the control moves a separation point more downstream, i.e. the width of the wake can be reduced. Moreover, increasing frequency ratio C f causes refining of the vortex structure. When the SJs are placed at the front or rear stagnation points, the wake tends towards the symmetrical pattern.
Highlights
Based on a need of energy input flow control methods can be categorized into passive and active [1]
If the Synthetic jet (SJ) was placed in the rear stagnation point, small close envelope was formed during the extrusion part of the period [7]
The aim of this work was an experimental investigation of the flow field around the circular cylinder under the active flow control
Summary
Based on a need of energy input flow control methods can be categorized into passive and active [1]. Synthetic jet (SJ) is one of the active methods used for flow control. An influence of the active flow control using SJs on the flow around a circular cylinder was extensively studied by many researches. If the SJ was placed in the rear stagnation point, small close envelope was formed during the extrusion part of the period [7]. During the intrusion part of the period the vortex pair is convected downstream from the both sides of the cylinder and interacts with the wake. In [8] it was found that vortex shedding under the flow control can be categorized into six regimes
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