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Flow structure of the free round turbulent jet in the initial region

Published online by Cambridge University Press:  19 April 2006

L. Bogusławski  and
Cz. O. Popiel
L. Bogusławski
Affiliation:
Heat and Mass Transfer Laboratory, Technical University of Poznań, Poland
Cz. O. Popiel
Affiliation:
Heat and Mass Transfer Laboratory, Technical University of Poznań, Poland
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Abstract

This note presents measurements of radial and axial distributions of mean velocity, turbulent intensities and kinetic energy as well as radial distributions of the turbulent shear stress in the initial region of a turbulent air jet issuing from a long round pipe into still air. The pipe flow is transformed relatively smoothly into a jet flow. In the core subregion the mean centre-line velocity decreases slightly. The highest turbulence occurs at an axial distance of about 6d and radius of (0·7 to 0·8)d. On the axis the highest turbulent kinetic energy appears at a distance of (7·5 to 8·5)d. Normalized distributions of the turbulent quantities are in good agreement with known data on the developed region of jets issuing from short nozzles.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 90 , Issue 3 , 13 February 1979 , pp. 531 - 539
Copyright
© 1979 Cambridge University Press

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