Jet column modes in both a plane jet and a passively modified plane jet subject to acoustic excitation

Jet column modes in both a plane jet and a passively modified plane jet subject to acoustic excitation

Use is made of acoustic excitation to enhance the coherent vortical structures that form in both a plane jet and a passively modified plane jet. The Strouhal number for the preferred mode based on the nozzle height of the jet is found to be unaffected by the passive modification. The existence of th...

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Veröffentlicht in:Experiments in fluids 2003-09, Vol.35 (3), p.278-287
Hauptverfasser: OLSEN, J. F, RAJAGOPALAN, S, ANTONIA, R. A
Format: Artikel
Sprache:eng
Schlagworte:
Acoustic excitation
Coherence
Columns (structural)
Exact sciences and technology
Excitation
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Jets
Nozzles
Physics
Planes
Strouhal number
Turbulence control
Turbulent flows, convection, and heat transfer
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Zusammenfassung:Use is made of acoustic excitation to enhance the coherent vortical structures that form in both a plane jet and a passively modified plane jet. The Strouhal number for the preferred mode based on the nozzle height of the jet is found to be unaffected by the passive modification. The existence of the jet column mode of stable pairing in the excited plane jet is unambiguously confirmed. Measurements in the excited and modified plane jet show that the passive modification suppresses this mode. Finally, the work shows the existence of a new mode of stable pairing. Both time- and phase-averaged measurements are presented to examine this mode.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-003-0663-4