Control of flow structures around a cylinder in deep water employing a passive control element
| Autor: | Besir Sahin, Sedat Yayla, Suleyman Teksin |
|---|---|
| Přispěvatelé: | Çukurova Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science Splitter plate Mechanical Engineering General Physics and Astronomy Reynolds number Mechanics Vorticity Vortex shedding 01 natural sciences flow control 010305 fluids & plasmas Vortex Physics::Fluid Dynamics symbols.namesake flexible splitter plate Particle image velocimetry 0103 physical sciences Turbulence kinetic energy particle image velocimetry symbols vortex shedding Streamlines streaklines and pathlines 010306 general physics |
| Popis: | WOS: 000485728100003 This study aimed to experimentally investigate the swirling flow characteristic in the periphery of a cylinder located vertically in a deep water channel using a particle image velocity measurement method (PIV). In addition to the PIV method, paint visualization experiments were performed to observe the structures of vortical flow qualitatively. Based on the cylinder diameter, Reynolds numbers were changed incrementally as 2.5 x 10(3), 5 x 10(3), and 7.5 x 10(3), while the length of the control element, L = 180 mm was kept constant. The flexible splitter plate made of a plastic material was easily deformed under the influence of vortical flow. In the horizontal plane, taken from the middleheight of the cylinder, instantaneous flow data was measured first. Along these measurements, the distributions and magnitude of the velocity vectors, < V >, vorticity concentrations, , patterns of streamlines, , root mean square of velocity component such as < urms > and < vrms >, correlations of shear stresses, < u'u'>, < v'v'> and < u'v'>, turbulent kinetic energy, TKE, and spectral analysis is conducted to define the frequency, f of vortex formations. The presence of a flexible flow control element located along the central axis line of the cylinder significantly affects the vortex formations. The existence of the flexible flow control element can significantly influence the wake flow region. Furthermore, many of the value of flow characteristics decreased as mentioned with respect to the bare case. Cukurova University, Mechanical Engineering Department, Laboratory of Fluid Mechanics Support from the Cukurova University, Mechanical Engineering Department, Laboratory of Fluid Mechanics is gratefully acknowledged. |
| Databáze: | OpenAIRE |
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