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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

NEAR FIELD VORTEX STRUCTURES OF INCLINED COAXIAL JETS

pages 499-504
DOI: 10.1615/TSFP6.790
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RÉSUMÉ

Inclined coaxial nozzles of 45° and 60° incline-angles, with area-ratio of 2.25 and velocity-ratios of 0.5 and 1, have been studied using flow visualisations to reveal the near-field vortex flow features. Streamwise and cross-stream cross-sections taken of the coaxial jets using laser-induced fluorescence technique show that unlike the case for an axisymmetric coaxial nozzle, inclined coaxial nozzles typically produce asymmetric flow fields along the inclined plane. A significant range of different flow behaviour can be observed, depending on the exact geometric and flow conditions, which will be described here. In general however, increasing either the incline-angle or velocity-ratio leads to considerable intensifications of the near-field vortex formations.

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