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Instantaneous Flow Field above the Free-end of Finite-height Cylinders and Prisms

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1710
pages 1673-1684

Noorallah Rostamy
Department of Mechanical Engineering, University of Saskatchewan 57 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5A9

David Sumner
Department of Mechanical Engineering University of Saskatchewan 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A2, Canada

Donald J. Bergstrom
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada

James D. Bugg
Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A9, Canada

要約

The flow above the free ends of surface-mounted finite-height circular cylinders and square prisms was studied experimentally using particle image velocimetry (PIV). Cylinders and prisms with aspect ratios of AR = 9, 7, 5, and 3 were tested at a Reynolds number of Re = 4.2×104. The bodies were mounted normal to a ground plane and were partially immersed in a turbulent flat-plate boundary layer, where the boundary layer thickness relative to the body width was δ/D = 1.6. PIV measurements were made above the free ends of the bodies in a vertical plane aligned with the flow centreline. The present PIV results provide insight into the effects of aspect ratio and body shape on aspects of the instantaneous flow field. The recirculation zone under the separated shear layer is larger for the square prism of AR = 3 compared to the more slender prism of AR = 9. Also, for a square prism with low aspect ratio (AR = 3), the influence of the reverse flow over the free end surface becomes more significant compared to that for a higher aspect ratio (AR = 9). For the circular cylinder, a cross-stream vortex forms within the recirculation zone. As the aspect ratio of the cylinder decreases, the reattachment point of the separated flow on the free end surface moves closer to the trailing edge. For both square prism and circular cylinder cases, the instantaneous velocity vectors and associated in-plane vorticity field revealed small-scale structures mostly generated by the separated shear layer.

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