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| Titel: |
Flow Characteristics around a Rotating Grooved Circular Cylinder with Grooved of Different Depths |
| Auteur: |
Takayama, S. Aoki, K. |
| Verschenen in: |
Journal of visualization |
| Paginering: | Jaargang 8 (2008) nr. 4 pagina's 295-303 |
| Jaar: |
2008-07-06 |
| Inhoud: |
The present paper describes the flow characteristics around a rotating grooved circular cylinder with grooves of different depths. The surface structure of a circular cylinder was varied by changing the depths of 32 arc grooves on the surface. The surface pressure on the cylinder is measured for the Re range of from 0.4 ×10^5 to 1.8×10^5 and for rotations of from 0 to 4500 rpm. The drag coefficient of a grooved cylinder increases as the spin rate ratio α (= rotational speed of the cylinder surface/uniform velocity) increases for Re > 1.0×10^5. As the groove depth increases, the drag coefficient of a grooved cylinder is independent from the spin rate ratio α. The direction of the lift force of a smooth cylinder is opposite to the Magnus force for Re > 1.0×10^5. However, the direction of the lift force of a grooved cylinder is the same as that of the Magnus force for all Re > 1.0×10^5. As the groove depth increases, the increase in the slope of the lift coefficient becomes small. These phenomena are related to the positions of the flow separation points, which are clarified from the pressure distribution and flow visualization by the spark tracing method. In addition, in the present study, the flow around a rotating grooved cylinder is clarified by flow visualization. |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 28 gevonden artikelen
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