Topical Problems of Fluid Mechanics


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Institute of Thermomechanics AS CR, v.v.i. CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics MIO Université du Sud Toulon Var - AMU - CNRS - IRD Czech Pilot centre ERCOFTAC
The Influence of Nozzle Contraction Upon the Near Flow Field for Axisymmetric Free Jet

Pawłowska A., Obała N.

Abstract:
The paper presents the results of experimental research in axisymmetric free jet performed in order to compare two test rigs (vertical aerodynamic channels) with different area contraction ratios of a nozzle. Both test rigs are of identical design as far as the settling chamber is concerned, but they have different area contraction ratio of a nozzle equal to , C1 = 144 and C2 = 225 respectively. Experiment was performed for range of the Reynolds number from 5 000 to 20 000, cylindrical nozzle extensions were used to change the exit shear layers thickness. Velocity and turbulence intensity distributions at the nozzle exit and along the jet axis were analysed. Integral parameters, maximum values of turbulence intensity in shear layer and mean values of turbulence intensity in a potential for two test rigs are also presented. Measurements were taken using the single wire CTA probe.

Keywords:
inlet conditions, axisymmetric free jet, turbulence intensity
Fulltext: PDF
DOI: No Doi
In Proceedings Topical Problems of Fluid Mechanics 2015, Prague, 2015 Edited by David Šimurda and Tomáš Bodnár, pp. 159-166
ISBN 978-80-87012-55-0 (Print)
ISSN 2336-5781 (Print)
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