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Type: Journal article
Title: The naturally oscillating flow emerging from a fluidic precessing jet nozzle
Author: Wong, C.
Nathan, G.
Kelso, R.
Citation: Journal of Fluid Mechanics, 2008; 606:153-188
Publisher: Cambridge Univ Press
Issue Date: 2008
ISSN: 0022-1120
Statement of
Chong Y. Wong, Graham J. Nathan and Richard M. Kelso
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.
Rights: © Cambridge University Press 2008
RMID: 0020081406
DOI: 10.1017/S0022112008001699
Appears in Collections:Mechanical Engineering publications
Environment Institute Leaders publications

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