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Stereo PIV measurements of fine-scale turbulence statistics in a free jet flow

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1820
12 pages

Sergey Alekseenko
Kutateladze Institute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090, Novosibirsk, Russia; Department of Physics, Novosibirsk State University

Vladimir M. Dulin
Kutateladze Institute of Thermophysics, 1, Lavrentyev Avenue, Novosibirsk, 630090, Russia; Department of Science and Research, Novosibirsk State University 2, Pirogova Street, 630090, Russia

Dmitriy M. Markovich
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences (IT SB RAS), 1, Lavrentyev Ave., Novosibirsk, 630090, Russia; Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Institute of Power Engineering, Tomsk Polytechnic University (TPU), 30, Lenin Ave., Tomsk, 634050, Russia

要約

In the present work the Stereo PIV technique, exploiting advanced calibration, processing and post-processing algorithms, was applied for the experimental study of the developing region of the turbulent free round jet at Re = 25,000. To investigate the effect of PIV spatial resolution on the measured turbulent characteristics, the experiments were performed with various optical resolutions of the PIV system (up to several Kolmogorov lengthscales per vector). The possible ways to account for PIV resolution effect on turbulence measurements were analysed. The efficiency of a LES-based approach for a classical Lilly's or modified turbulent viscosity, to estimate the dissipation from small-scale turbulent motions, unresolved by PIV, was studied. Also an approach assuming isotropic or non-isotropic low-pass spatial filtering of velocity fluctuations was applied to predict the underestimation extent of the second- and third-order moments and dissipation.

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