Effect of a small axisymmetric contraction on grid turbulence

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
Reviewed

		Thumbnail	File	Description	Size	Format