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2014 | OriginalPaper | Buchkapitel

Comparison of the Near-Field Flow Structures of a Triangular Jet with and without the Initial Confinement of a Chamber

verfasst von : M. Xu, S. K. Lee, J. Mi, P. Li, J. Zhang

Erschienen in: Fluid-Structure-Sound Interactions and Control

Verlag: Springer Berlin Heidelberg

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Abstract

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.

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Literatur
Zurück zum Zitat England G, Kalt P, Nathan G, Kelso R (2010) The effect of density ratio on the near field of a naturally occurring oscillating jet. Exp Fluids 48:69–80CrossRef England G, Kalt P, Nathan G, Kelso R (2010) The effect of density ratio on the near field of a naturally occurring oscillating jet. Exp Fluids 48:69–80CrossRef
Zurück zum Zitat Mi J, Nathan GJ, Luxton RE (2004) Family of oscillating jets. Pat App No. PCT/AU98/00959. The US Patent No. 6685102 (2004.2), European Pat. No. 1032789 (2004.9), Australian Pat. No. 746248 (2004.2), New Zealand Pat. No. 504470 (2003.7) Mi J, Nathan GJ, Luxton RE (2004) Family of oscillating jets. Pat App No. PCT/AU98/00959. The US Patent No. 6685102 (2004.2), European Pat. No. 1032789 (2004.9), Australian Pat. No. 746248 (2004.2), New Zealand Pat. No. 504470 (2003.7)
Zurück zum Zitat Nathan GJ, Mi J, Alwahabi ZT, Newbold GJR, Nobes DS (2006) Impacts of a jet’s exit flow pattern on mixing and combustion performance. Prog Energy Combust Sci 32:496–538CrossRef Nathan GJ, Mi J, Alwahabi ZT, Newbold GJR, Nobes DS (2006) Impacts of a jet’s exit flow pattern on mixing and combustion performance. Prog Energy Combust Sci 32:496–538CrossRef
Zurück zum Zitat Xu M, Mi J, Li P (2012) Large Eddy simulation of an initially-confined triangular oscillating jet. Flow, Turbulence Combus 88:1–20CrossRef Xu M, Mi J, Li P (2012) Large Eddy simulation of an initially-confined triangular oscillating jet. Flow, Turbulence Combus 88:1–20CrossRef
Zurück zum Zitat Xu M, Zhang J, Mi J, Nathan GJ, Kalt PAM (2013) PIV measurements of turbulent jets issuing from triangular and circular orifice plates. Sci China, Ser G 56:1176–1186CrossRef Xu M, Zhang J, Mi J, Nathan GJ, Kalt PAM (2013) PIV measurements of turbulent jets issuing from triangular and circular orifice plates. Sci China, Ser G 56:1176–1186CrossRef
Metadaten
Titel
Comparison of the Near-Field Flow Structures of a Triangular Jet with and without the Initial Confinement of a Chamber
verfasst von
M. Xu
S. K. Lee
J. Mi
P. Li
J. Zhang
Copyright-Jahr
2014
Verlag
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-642-40371-2_21

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