Experimental study on passive flow control of circular cylinder via perforated splitter plate

Serdar Sahin, Tahir Durhasan, Engin Pinar and Huseyin Akilli

Abstract

Present experimental investigation aims to reduce the shedding of vortex in the near wake region of a circular cylinder using a perforated splitter plate. Perforated plates were placed in the wake region of the cylinder and aligned with the streamwise direction. The length of the plates was equal to the diameter of the cylinder. Different plate porosities and locations were examined and obtained results were compared to the baseline cylinder. Flow measurements downstream of the cylinder were performed in a water channel by employing a particle image velocimetry technique (PIV) at a Reynolds number of Re=5x103. It is observed that the effect of the porosity on the flow characteristics of the cylinder depends on the location of the plate. The strength of shear layers and flow fluctuations in the near wake region of the cylinder are considerably diminished by the perforated splitter plate. It is found that the porosity of ε=0.3 is the most effective control element for gap ratio of G/D=0.5. On the other hand, proper gap ratio is determined as G/D=2 for porosity of ε=0.7. It is concluded in the present study that the perforated splitter plate could be used as alternative passive flow control technique in order to reduce vortex shedding of the cylinder.

Key Words

circular cylinder; passive flow control; perforated splitter plate; vortex shedding reduction

Address

Serdar Sahin:Department of Mechanical Engineering, University of Cukurova, Adana, 01330, Turkey Tahir Durhasan:Department of Aerospace Engineering, University of Adana Alparslan Turkes Science and Technology, Adana, 01250, Turkey Engin Pinar:Department of Ceyhan Mechanical Engineering, University of Cukurova, Adana, 01950, Turkey Huseyin Akilli:Department of Mechanical Engineering, University of Cukurova, Adana, 01330, Turkey

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