Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/121480
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Type: Journal article
Title: Characteristics of swirling and precessing flows generated by multiple confined jets
Author: Long, S.
Lau, T.
Chinnici, A.
Tian, Z.
Dally, B.
Nathan, G.
Citation: Physics of Fluids, 2019; 31(5):055102-1-055102-14
Publisher: AIP Publishing
Issue Date: 2019
ISSN: 1070-6631
1089-7666
Statement of
Responsibility: 
Shen Long, Timothy C. W. Lau, Alfonso Chinnici, Zhao Feng Tian, Bassam B. Dally and Graham J. Nathan
Abstract: An experimental study is reported of the interaction between multiple isothermal jets within a cylindrical chamber under conditions relevant to a wide range of engineering applications, including the confined swirl combustors, industrial mixers, and concentrated solar thermal devices. The particle image velocimetry technique was used to investigate the swirling and precessing flows generated with four rotationally symmetric inlet pipes at a fixed nozzle Reynolds number of ReD = 10 500 for two configurations of swirl angle (5° and 15°) and two alternative tilt angles (25° and 45°). The measurements reveal three distinctive rotational flow patterns within the external recirculation zone (ERZ) and the central recirculation zone (CRZ) for these configurations. It was found that the mean and root-mean-square flow characteristics of the swirl within the chamber depend strongly on the relative significance of the ERZ and CRZ, with the swirling velocity being higher in the CRZ than that in the ERZ. A precessing vortex core was identified for all experimental conditions considered here, although its significance was less for the cases with a dominant CRZ.
Rights: © 2019 Author(s).
RMID: 0030116976
DOI: 10.1063/1.5089904
Grant ID: http://purl.org/au-research/grants/arc/LP110200060
Published version: https://aip.scitation.org/journal/phf
Appears in Collections:Mechanical Engineering publications

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