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Velocity measurements in a high-Reynolds-number, momentum-conserving, axisymmetric, turbulent jet

Published online by Cambridge University Press:  26 April 2006

Hussein J. Hussein ,
Steven P. Capp  and
William K. George
Hussein J. Hussein
Affiliation:
Turbulence Research Laboratory, Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA Present address: Vanderbilt University, Nashville, TN, USA.
Steven P. Capp
Affiliation:
Turbulence Research Laboratory, Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA Present address: Harrison Radiator Division, General Motors Corp., Lockport, NY, USA.
William K. George
Affiliation:
Turbulence Research Laboratory, Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA
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Abstract

The turbulent flow resulting from a top-hat jet exhausting into a large room was investigated. The Reynolds number based on exit conditions was approximately 105. Velocity moments to third order were obtained using flying and stationary hot-wire and burst-mode laser-Doppler anemometry (LDA) techniques. The entire room was fully seeded for the LDA measurements. The measurements are shown to satisfy the differential and integral momentum equations for a round jet in an infinite environment.

The results differ substantially from those reported by some earlier investigators, both in the level and shape of the profiles. These differences are attributed to the smaller enclosures used in the earlier works and the recirculation within them. Also, the flying hot-wire and burst-mode LDA measurements made here differ from the stationary wire measurements, especially the higher moments and away from the flow centreline. These differences are attributed to the cross-flow and rectification errors on the latter at the high turbulence intensities present in this flow (30% minimum at centreline). The measurements are used, together with recent dissipation measurements, to compute the energy balance for the jet, and an attempt is made to estimate the pressure-velocity and pressure-strain rate correlations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 258 , 10 January 1994 , pp. 31 - 75
Copyright
© 1994 Cambridge University Press

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