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EnglishAn experimental analysis of the dominant instabilities in the near field of two coaxial jets is presented and discussed. Different inner/outer jet velocity pairs Ui ,Uo have been tested in order to investigate the effect of both velocity ratio ru=Uo /Ui and Reynolds number. Three main instabilities have emerged depending on the velocity ratio. For ru=0.75, the coaxial jets dynamic is driven by the inner shear layer. For ru=1.6, the outer shear layer dominates the near field vortex dynamics while for ru nearly unitary, the vortex shedding behind the separating wall imposes its own dynamics. A new scaling relationship is proposed to improve the estimation of the shedding frequency with respect to the one found in literature.
| Titolo: | Experimental analysis of dominant instabilities in coaxial jets | |
| Autore/i: | A. Segalini; TALAMELLI, ALESSANDRO | |
| Autore/i Unibo: | ||
| Anno: | 2011 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1063/1.3553280 | |
| Abstract: | An experimental analysis of the dominant instabilities in the near field of two coaxial jets is presented and discussed. Different inner/outer jet velocity pairs Ui ,Uo have been tested in order to investigate the effect of both velocity ratio ru=Uo /Ui and Reynolds number. Three main instabilities have emerged depending on the velocity ratio. For ru=0.75, the coaxial jets dynamic is driven by the inner shear layer. For ru=1.6, the outer shear layer dominates the near field vortex dynamics while for ru nearly unitary, the vortex shedding behind the separating wall imposes its own dynamics. A new scaling relationship is proposed to improve the estimation of the shedding frequency with respect to the one found in literature. | |
| Data prodotto definitivo in UGOV: | 2013-06-26 11:23:09 | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/11585/107055
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