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The naturally oscillating flow emerging from a fluidic precessing jet nozzle

Published online by Cambridge University Press:  10 July 2008

CHONG Y. WONG ,
GRAHAM J. NATHAN  and
RICHARD M. KELSO
CHONG Y. WONG
Affiliation:
School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia
GRAHAM J. NATHAN
Affiliation:
School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia
RICHARD M. KELSO
Affiliation:
School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia
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Abstract

Phase-averaged and directionally triggered digital particle image velocimetry measurements were taken in longitudinal and transverse planes in the near field of the flow emerging from a fluidic precessing jet nozzle. Measurements were performed at nozzle inlet Reynolds and Strouhal numbers of 59000 and 0.0017, respectively. Results indicate that the jet emerging from the nozzle departs with an azimuthal component in a direction opposite to that of the jet precession. In addition, the structure of the ‘flow convergence’ region, reported in an earlier study, is better resolved here. At least three unique vortex-pair regions containing smaller vortical ‘blobs’ are identified for the first time. These include a vortex-pair region originating from the foci on the downstream face of the nozzle centrebody, a vortex-pair region shed from the edge of the centrebody and a vortex-pair region originating from the downstream surface of the nozzle exit lip.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 606 , 10 July 2008 , pp. 153 - 188
Copyright
Copyright © Cambridge University Press 2008

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