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The experimental investigation of the effect of chamber length on jet precession Open Access

Descriptions

Other title
Subject/Keyword
centerline velocity decay
axisymmetric jet
chamber length
self-similar
precessing jet
particle image velocimetry
StereoPIV
initial condition
jet precession
precession
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Madej, Adam Martin
Supervisor and department
Nobes, David (Mechanical Engineering)
Examining committee member and department
Nobes, David (Mechanical Engineering)
Koch, Bob (Mechanical Engineering)
Kresta, Suzanne (Chemical and Materials Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2010-08-06T18:05:02Z
Graduation date
2010-11
Degree
Master of Science
Degree level
Master's
Abstract
The effect of chamber length and Reynolds number on the stability and behavior of the flow field generated by a precessing jet nozzle was studied using stereoscopic particle image velocimetry (StereoPIV). An algorithm was developed to determine the mode of the flow based on the distribution of axial velocity. The optimal chamber length for precession to occur was found to be between 2 and 2.75 chamber-diameters. There is no precession at a chamber length of one diameter, and the occurrence of precession was found to be strongly related to Reynolds number. Conditionally averaged velocity distributions for the flow in precessing mode were calculated. The effect of initial condition on downstream behavior of axisymmetric jets was examined. Variations in spread and decay rates were found for jets issuing from different nozzles. Self-similar solutions for axisymmetric jets are therefore not universal, and are instead dependent upon initial conditions at the source.
Language
English
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: CHAPTER 1: Introduction
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