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Experimental investigation of helicity in turbulent swirling jet using dual-plane dye laser PIV technique

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posted on 03.03.2017, 09:07 by Gavita Regunath, William B. Zimmerman, Vaclav Tesar, Buddhika N. Hewakandamby
This paper reports a new method of generating two light sheets using a dye laser system and the use of this dual-plane dye laser system to analyse average helicity and energy dissipation in a turbulent swirling flow. The dual-plane PIV system that was used in this study consisted of three cameras and a single frequency Nd:YAG laser, which was used to generate two parallel light sheet planes with differing wavelengths(colour). The method of generating two different light sheet wavelengths using a single laser source is an innovative and new technique. Stereoscopic PIV measurements were obtained in one plane with the use of two CCD cameras, and standard PIV measurements were obtained in the other plane with the use of one CCD camera. The light scattered by the particles on two different light sheets were separated using appropriate optical filters. The measurements obtained were used to estimate the components of the velocity gradient tensor. The tensor components were then used to determine the average vorticity components and helicity quantities of the fluid that was investigated. To determine the average turbulent kinetic energy dissipation, the continuity equation was used to infer the out-of-plane gradient of the out-of-plane velocity. From the analysis of the results, it was found that regions with high helicity were correlated with regions of high turbulent kinetic energy dissipation. © 2008 Springer-Verlag.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Experiments in Fluids

Volume

45

Issue

6

Pages

973 - 986

Citation

REGUNATH, G.S. ... et al, 2008. Experimental investigation of helicity in turbulent swirling jet using dual-plane dye laser PIV technique. Experiments in Fluids, 45 (6), pp.973-986

Publisher

© Springer

Version

NA (Not Applicable or Unknown)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2008

Notes

This paper is closed access.

ISSN

0723-4864

eISSN

1432-1114

Language

en

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