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The plane turbulent impinging jet

Published online by Cambridge University Press:  19 April 2006

E. Gutmark ,
M. Wolfshtein  and
I. Wygnanski
E. Gutmark
Affiliation:
Department of Aeronautical Engineering, Technion-Israel Institute of Technology, Haifa
M. Wolfshtein
Affiliation:
Department of Aeronautical Engineering, Technion-Israel Institute of Technology, Haifa
I. Wygnanski
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
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Abstract

This paper presents an experimental study of the turbulent structure on the centre-line of a two-dimensional impinging jet. The mean velocity, turbulent stresses, triple velocity products and temporal derivatives were measured and the energy balances for the three fluctuating components were calculated. The results indicate a selective stretching of vortices in the direction in which the streamlines spread near the wall, causing anisotropy in this region. The distribution of energy among various frequencies was found from spectral measurements. These measurements revealed the existence of a neutral frequency above which the energy was attenuated by viscous dissipation and below which it was augmented by a vortex-stretching mechanism.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 88 , Issue 4 , 27 October 1978 , pp. 737 - 756
Copyright
© 1978 Cambridge University Press

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