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PIV investigations on optical magnification and small scales in the near-field of an orifice jet

PIV investigations on optical magnification and small scales in the near-field of an orifice jet
PIV investigations on optical magnification and small scales in the near-field of an orifice jet

Among turbulent jets, the orifice jet is still far from being fully understood especially due to the phenomenon of “vena contract”, which takes place in the near field. In this work, the attention is focused to large-scale statistics (mean field and higher statistical moments of the velocity) and to small-scale statistics (velocity derivative statistical moments) of such a jet, with a special focus onto the effect of optical magnification on particle image veloci-metry measurements. In order to investigate this effect on the measurements, framed areas of different size have been considered by changing the magnification factor through the object plane distance. The obtained results show that a limit on the choice of this parameter exists for a proper description of both small and large scales.

0723-4864
1-11
Lacagnina, G.
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Romano, G.P.
ae4ff7ee-71ee-4ea7-8b53-b16f52547a30
Lacagnina, G.
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Romano, G.P.
ae4ff7ee-71ee-4ea7-8b53-b16f52547a30

Lacagnina, G. and Romano, G.P. (2015) PIV investigations on optical magnification and small scales in the near-field of an orifice jet. Experiments in Fluids, 56 (1), 1-11. (doi:10.1007/s00348-014-1872-8).

Record type: Article

Abstract

Among turbulent jets, the orifice jet is still far from being fully understood especially due to the phenomenon of “vena contract”, which takes place in the near field. In this work, the attention is focused to large-scale statistics (mean field and higher statistical moments of the velocity) and to small-scale statistics (velocity derivative statistical moments) of such a jet, with a special focus onto the effect of optical magnification on particle image veloci-metry measurements. In order to investigate this effect on the measurements, framed areas of different size have been considered by changing the magnification factor through the object plane distance. The obtained results show that a limit on the choice of this parameter exists for a proper description of both small and large scales.

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More information

e-pub ahead of print date: 10 January 2015
Published date: January 2015

Identifiers

Local EPrints ID: 420508
URI: https://eprints.soton.ac.uk/id/eprint/420508
ISSN: 0723-4864
PURE UUID: 5c23e162-0ffd-4809-a8e8-ce309a952ef2
ORCID for G. Lacagnina: ORCID iD orcid.org/0000-0002-8038-1127

Catalogue record

Date deposited: 09 May 2018 16:30
Last modified: 05 Nov 2019 01:28

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Contributors

Author: G. Lacagnina ORCID iD
Author: G.P. Romano

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