Flow Past a Grooved Circular Cylinder | ||
| ERJ. Engineering Research Journal | ||
| Article 8, Volume 21, Issue 2, April 1998, Pages 105-119 PDF (1.17 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/erjm.1998.73025 | ||
| Authors | ||
| Gamal H. Moustafa; A. M. Alam El-din | ||
| Mechanical Power Engineering Dept. Faculty of Engineering Menoufia University, Shiben El-Kom EGYPT | ||
| Abstract | ||
| An attempt is made to clearly distingxish the effect of a groove shape on the aerodynamic characteristics of a circular cylinder. The grooves are used as a passive control for the boundary layer separation. Grooves of different cross section shapes are made on the cylinder surface to investigate the effect of a regular surface configuration and to elucidate the flow structure in the wake region where the effect ofgrooves is existed. The results show that the grooves greatly affect the location of the separation point in which a shift of the flow regime to lower Reynolds number is found. The subcritical, critical and supercritical regimes can easily identified from flow measurements. It is found that the critical Reynolds number for tested grooved cylinders is 5x10~ which are below the subcritical Reynolds number of a smooth cylinder. The critical Reynolds number for a smooth cylinder is 3x10'. The main features of the boundary layer development are quit the same as that of the smooth cylinder. The boundary layer thckness and shape factor are large for grooved cylinders compared to that of the smooth cylinders and these results are in good agreement with previous available data. | ||
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