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Dual Plane Piv Investigation of Acoustically Excited Jets in a Swirl Nozzle : Volume 2, Issue 5 (04/09/2015)

By Regunath, G. S.

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Book Id: WPLBN0004023475
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Dual Plane Piv Investigation of Acoustically Excited Jets in a Swirl Nozzle : Volume 2, Issue 5 (04/09/2015)  
Author: Regunath, G. S.
Volume: Vol. 2, Issue 5
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Rees, J. M., Zimmerman, W. B., & Regunath, G. S. (2015). Dual Plane Piv Investigation of Acoustically Excited Jets in a Swirl Nozzle : Volume 2, Issue 5 (04/09/2015). Retrieved from http://hawaiilibrary.net/


Description
Description: Department of Aeronautical and Automotive Engineering, Stewart Miller Building, Loughborough University, Leicestershire LE11 3TU, UK. A novel dual-plane dye laser PIV technique used to analyze helicity and energy dissipation in an unexcited turbulent swirling jet of pressurized cold air has established that regions within the flow field of the jet exhibiting high helicity are correlated with regions of high turbulent kinetic energy dissipation. This PIV configuration provides estimates of all components of the velocity gradient tensor, facilitating calculation of the helicity from the vorticity components. Application of this novel dual-plane PIV technique is extended in this study to investigate helical structures in a turbulent swirling jet where the underlying shear flow is subjected to external acoustic sinusoidal forcing in a plane perpendicular to the central axis of the jet. It was found that acoustic excitation had a significant effect on the mean velocity profile parallel to the direction of the jet. The horizontal forcing resulted in the generation of vorticity that was skewed with a pitch that favored a distribution of angles around 90° with respect to the velocity vector. The distribution of the time-averaged helicity angle indicated organized helical activity, but such activity is not dominated by large-scale coherent structures of maximal helicity.

Summary
Dual plane PIV investigation of acoustically excited jets in a swirl nozzle

Excerpt
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