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Applicability of Reichardt's Hypothesis to the Prediction of Velocity Field of Multiple Parallel Plane Jets

Published online by Cambridge University Press:  05 May 2011

A. Nasr  and
J. Lai
A. Nasr*
Affiliation:
School of Railway Engineering, Iran University of Science and Technology, Narmak, Tehran 16844, Iran
J. Lai*
Affiliation:
School of Engineering and Information Technology, The University of New South Wales at the Australian Defence Force Academy, Canberra, ACT 2600, Australia
*
* Assistant Professor
** Professor
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Abstract

In this paper the velocity distribution for multiple parallel plane jets based on the superposition of Reichardt's solution for single free jet is derived. The extend of the applicability of Reichardt's hypothesis to prediction of multiple parallel plane jets is examined. Both ventilated and unventilated two parallel plane jets data published in the literature and obtained for this study were used for comparisons with the theoretical results obtained from Reichardt's hypothesis. LDA measurements of mean streamwise velocities and turbulence characteristics of an array of 5 parallel plane jets were also made in order to establish the conditions under which this heuristic approach is valid. Results show that provided the pressure gradient in the lateral direction is small and hence the deflection of the individual jet center line is small, there is a good agreement between experimental results and predictions based on Reichardt's hypothesis for multiple parallel plane jets.

Keywords

Maglev trainsLODA measurementsReichradt's hypothesisTrain aerodynamic
Type
Technical Note
Information
Journal of Mechanics , Volume 26 , Issue 2 , June 2010 , pp. N17 - N22
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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