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Semi-preserving development of a slightly heated free swirling jet

Published online by Cambridge University Press:  26 April 2006

J. W. Elsner  and
L. Kurzak
J. W. Elsner
Affiliation:
Thermal Machinery Institute, Technical University of Częstochowa, Deglera 35, 42-200 Częstochowa, Poland
L. Kurzak
Affiliation:
Thermal Machinery Institute, Technical University of Częstochowa, Deglera 35, 42-200 Częstochowa, Poland
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Abstract

The paper formulates the concept of a semi-preserving developing of a free nonisothermal swirling jet. On the basis of experimental data it may be estimated that the semi-preserving conditions are established at the distance x − x0 ≈ (15−20) D. Also, it has been pointed out that self-preservation, which requires the turbulence structure to be similar during decay, may be considered as an asymptotic state of the semi-preserving development achieved in practice at a distance where $\overline{u_r u_{\phi}/ \overline(u_x u_r) \ll 1\cdot 0$.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 199 , February 1989 , pp. 237 - 255
Copyright
© 1989 Cambridge University Press

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