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On the universality of global modes in low-density axisymmetric jets

Published online by Cambridge University Press:  15 November 2006

M. P. HALLBERG  and
P. J. STRYKOWSKI
M. P. HALLBERG
Affiliation:
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
P. J. STRYKOWSKI
Affiliation:
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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Abstract

Experiments conducted in axisymmetric low-density jets reveal that the transition to global instability and the frequency selection of the global mode depend on the operating parameters of density ratio, momentum thickness, and Reynolds number. The onset of the global mode was mapped in the Reynolds number–momentum thickness operating domain for density ratios $S \,{=}\, \rho_{j}/\rho_{\infty}$ ranging from 0.14 to 0.5. The results provide convincing evidence of the universality of global oscillations in low-density jets and indicate that conditions in the jet exit plane are responsible for driving the global instability.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 569 , 25 December 2006 , pp. 493 - 507
Copyright
© 2006 Cambridge University Press

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