Base Bleed Flow Control Tool for Circular Cylinders with three Side-By-Side Arrangements in Shallow Water

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Published Jun 4, 2023
https://doi.org/10.56158/jpte.2023.44.2.01
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Statistic
Vol. 2 No. 01 (2023): June

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Mustafa Atakan Akar
Faculty of Engineering, Automotive Engineering, Cukurova University, Adana, Turkey
https://orcid.org/0000-0002-0192-0605
Hüseyin Akıllı
The Faculty of Engineering, Mechanical Engineering, Cukurova University, Adana, Turkey
https://orcid.org/0000-0002-5342-7046

Abstract

In this study, Particulate Image Velocimetry (PIV) was utilized to determine the flow characteristics of three side-by-side circular cylinders with a base bleed. The height of the water was set as hW=20 mm which has characteristics of shallow water and flow images were captured from an elevation of hL/hW= 0.5 (mid-plane of water height). The freestream velocity of water and circular cylinder diameters were chosen as U∞=0.125 m/sec and D=40 mm, respectively which are the corresponding Reynolds number of ReD=5000. Three different gap/diameter ratios between the cylinders were tested as G/D=1.0, 1.25, and 1.5 throughout the experiments. As a passive flow control technique, base bleed slots located through the cylinders were used with the dimensionless width ratio of B/D= 0.05 to 0.25 with 0.05 increment. As a result of the study, the base bleed was found out an effective way to control unsteady wake. Besides, whereas the increasing height of VSP results in further decrement turbulence statistics, Increasing the width of base bleed leads to a reduction of maximum Reynolds shear stress concentration. Nevertheless, jet deflection flow cannot be avoided for the G/D=1.25 while, flow deflection is avoided with all base bleed case the gap ratio increases to G/D=1.5. The wake size of each cylinder is almost the same for G/D=1.5.

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

How to Cite
Akar, M. A., & Akıllı, H. (2023). Base Bleed Flow Control Tool for Circular Cylinders with three Side-By-Side Arrangements in Shallow Water. International Journal of Pioneering Technology and Engineering, 2(01), 128–134. https://doi.org/10.56158/jpte.2023.44.2.01

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