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For deletion - incorrect category


Xu, M and Lee, SK and Mi, J and Li, P and Zhang, J, For deletion - incorrect category, Lecture Notes in Mechanical Engineering, pp. 149-154. ISBN 978-3-642-40371-2 (2014) [Research Book Chapter]

DOI: doi:10.1007/978-3-642-40371-2_21


© Springer-Verlag Berlin Heidelberg 2014. This paper reports a large eddy simulation (LES) of the precession-like oscillation produced by partially confining a triangular-jet flow with a short cylindrical chamber. The present LES, which has been verified by previous experimental data, shows that there is a strong inward swirl around the jet near the inlet end of the chamber. At the center of the swirl, there is a cluster of three sink foci, where each focus is aligned midway between the corners of the triangular inlet orifice. In the time-averaged flow field, the vortices rising from the foci are helically twisted about the core of the jet. As the flow passes through the chamber, the foci merge to form a closed-loop ‘‘bifurcation line’’ which separates the inward swirl and the core flow. The core of the emerging jet is visible as a source node at the approximate centerline of the chamber. If the chamber is removed, a cluster of six counter-rotating foci is produced in the ‘‘free’’ jet. When this happens, the net swirl circulation is zero and there is no jet oscillation.

Item Details

Item Type:Research Book Chapter
Research Division:Mathematical Sciences
Research Group:Pure Mathematics
Research Field:Algebra and Number Theory
Objective Division:Defence
Objective Group:Defence
Objective Field:Air Force
Author:Lee, SK (Dr Soon-Kong Lee)
ID Code:119431
Year Published:2014
Deposited By:Australian Maritime College
Deposited On:2017-08-01
Last Modified:2017-10-05

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