Dynamics of large-scale vortices in non-swirling and swirling turbulent jets. time-resolved tomographic PIV measurements

Conference paper (2017)

Authors

Vladimir M. Dulin Novosibirsk State University
Sergey S. Abdurakipov Novosibirsk State University
Dmitriy M. Markovich Novosibirsk State University
K. Hanjalic ChemE/Transport Phenomena - AS
Research Group
ChemE/Transport Phenomena (AS) (TU Delft)
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Published Date

2017

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Transport Phenomena

Abstract

The paper reports on a parallel study of the dynamics of large-scale vortical structures in non-swirling, low-swirl and high-swirl turbulent jets by means of the time-resolved tomographic PIV technique. 3D realizations of the instantaneous velocity and velocity gradients, local strain and rotation rates, helicity and pressure fluctuations are analyzed. Deformation of the large-scale vortices is studied by evaluating the local stretching/compression rates and local values of the Lamb vector divergence. Linear stability analysis is also applied to the mean velocity profiles in order to identify the most unstable azimuthal modes.

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