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Comparison of the near-field flow structures of a triangular jet with and without the initial confinement of a chamber

conference contribution
posted on 2023-05-23, 12:22 authored by Xu, M, Lee, SK, Mi, J, Li, P, Zhang, J
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.

History

Publication title

Fluid-Structure-Sound Interactions and Control: Proceedings of the 2nd Symposium on Fluid-Structure-Sound Interactions and Control

Volume

8

Editors

Y Zhou, Y Liu, L Huang, D Hodges

Pagination

149-154

ISSN

2195-4356

Department/School

Australian Maritime College

Publisher

Springer-Verlag

Place of publication

Germany

Event title

2nd Symposium on Fluid-Structure-Sound Interactions and Control

Event Venue

Hong Kong and Macau

Date of Event (Start Date)

2013-05-20

Date of Event (End Date)

2013-05-23

Rights statement

Copyright 2014 Springer-Verlag Berlin Heidelberg

Repository Status

  • Restricted

Socio-economic Objectives

Management of noise and vibration from transport activities