Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/59627
Type: Thesis
Title: The flow within and in the near external field of a fluidic precessing jet nozzle.
Author: Wong, Chong Yau
Issue Date: 2004
School/Discipline: School of Mechanical Engineering
Abstract: This thesis examines the internal and near external flow fields of a nozzle which produces a naturally precessing fluidic jet (FPJ). The internal flow is investigated by phas-eaveraged Laser-Doppler anemometry (LDA) using a total pressure probe as a phase sensor, while the external flow is investigated primarily by phase-averaged Particle Image Velocimetry (PIV) using a pair of hot-wire probes as the phase sensor, and LDA. The internal flow results partially confirm the flow structure proposed by earlier investigators and demonstrate the effect of the reversed axial flow on the internal jet within the FPI chamber. The results also support the presence of a driving vortex proposed in the literature. A plethora of experimental techniques progressively reveal the characteristics and features of the external precessing jet. The characteristics of the jet at the exit plane are found to be sensitive to inlet conditions and to inlet Reynolds number. The structure of the flow emerging from the FPJ exit is revealed, and found to contain several significant vortical features. Based on the evidence gathered from all the experiments, a new flow structure of the external precessing jet is proposed. Finally, the new experimental data are used to define Strouhal and Reynolds numbers based on the actual characteristics of the emerging jet. These allow the FPJ flow to be compared with other flows such as mechanical precessing jets.
Dissertation Note: Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2004
Keywords: fluidic precessing jet; jet nozzel flow; flow analysis
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exception. If you are the author of this thesis and do not wish it to be made publicly available or If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals
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