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.
1-11
Lacagnina, G.
b6c548d0-38b3-4f0f-9f0a-9849cb910113
Romano, G.P.
ae4ff7ee-71ee-4ea7-8b53-b16f52547a30
January 2015
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), .
(doi:10.1007/s00348-014-1872-8).
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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e-pub ahead of print date: 10 January 2015
Published date: January 2015
Identifiers
Local EPrints ID: 420508
URI: http://eprints.soton.ac.uk/id/eprint/420508
ISSN: 0723-4864
PURE UUID: 5c23e162-0ffd-4809-a8e8-ce309a952ef2
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Date deposited: 09 May 2018 16:30
Last modified: 15 Mar 2024 19:16
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Author:
G. Lacagnina
Author:
G.P. Romano
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