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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

FLOW CHARACTERISTICS OF INCLINED ELLIPTIC NOZZLES

pages 941-946
DOI: 10.1615/TSFP6.1510
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摘要

A flow visualization and digital particle image velocimetry study has been carried out to investigate the resultant flow behaviour of elliptic nozzles with 30° and 60° inclined exits along the major- and minor-planes. Flow images show that regardless of incline-plane, persistently inclined vortex roll-ups are produced for 30° incline case, whereas they undergo rapid turning for the 60° incline case. Axis-switching behaviour is either distorted or suppressed in all inclined nozzles tested. Systematic differences in the vorticity distributions and magnitudes suggest that imposing inclined exits leads to dissimilar vortex-stretching, the extent of which depends on the exact nozzle configuration. Lastly, Reynolds flow stress results indicate that the resultant mixing haracteristics are strongly affected by the inclined nozzle designs.

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