- Title
- Effect of a small axisymmetric contraction on grid turbulence
- Creator
- Antonia, Robert A.; Lavoie, P.; Djenidi, L.; Benaissa, A.
- Relation
- Experiments in Fluids Vol. 49, p. 3-10
- Publisher Link
- http://dx.doi.org/10.1007/s00348-009-0704-8
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2010
- Description
- Measurements downstream of a grid followed by a contraction with an area ratio of 1.36 have been made with a one-component vorticity probe. The velocity data indicate that there is indeed an improvement in isotropy of the large scales when such a contraction is used. In particular, the spectrum of u loses a significant amount of low frequency energy and its peak is shifted towards that of v. Although the v spectrum is less affected than the u spectrum, the relative magnitudes of the u and v spectra satisfy isotropy more closely with than without the contraction. In particular, isotropy is most closely approximated when the contraction is used in combination with a grid designed to minimise vortex shedding. The lateral vorticity spectrum is essentially unaffected, irrespective of the grid that is used or the magnitude of the wavenumber.
- Subject
- axisymmetric contraction; grid turbulence; measurements; vorticity spectrum; vorticity probe
- Identifier
- http://hdl.handle.net/1959.13/921798
- Identifier
- uon:9404
- Identifier
- ISSN:0723-4864
- Language
- eng
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