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Experiments on swirling turbulent flows. Part 1. Similarity in swirling flows

Published online by Cambridge University Press:  29 March 2006

K. S. Yajnik  and
M. V. Subbaiah
K. S. Yajnik
Affiliation:
National Aeronautical Laboratory, Bangalore, India
M. V. Subbaiah
Affiliation:
National Aeronautical Laboratory, Bangalore, India
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Abstract

The effects of swirl on internal turbulent flows are studied by conducting experiments on turbulent pipe flow with variable initial swirl. This first part of the study is primarily concerned with similarity laws. The mean velocity profiles, both away from and close to the wall, are found to admit similarity representations at sufficiently large Reynolds numbers, provided that flow reversal does not take place near the entrance. While the wall law is not sensibly dependent on swirl, the velocity defect law in its extended form is sensitive to swirl. Further, a logarithmic skin-friction law is obtained in which only the additive coefficient depends on swirl. This coefficient is found to vary linearly with the swirl angle in the range of the present experiments.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 60 , Issue 4 , 9 October 1973 , pp. 665 - 687
Copyright
© 1973 Cambridge University Press

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