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Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

EXPERIMENTAL INVESTIGATION OF SMALL SCALE GEOMETRIES IN A TURBULENT ROUND JET

pages 1-6
DOI: 10.1615/TSFP7.1500
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Краткое описание

Based on highly accurate three-dimensional measurements of a scalar field θ, which in the present study is the concentration field of gaseous propane discharging into ambient air from a turbulent round jet, we validate the model equation for the normalized marginal probability density function (pdf) P(l) derived by Wang and Peters in the context of dissipation element analysis. Combining a two-dimensional highspeed Rayleigh scattering technique with Taylor's hypothesis allows to resolve the Kolmogorov scale ν in every spatial direction so that the theoretically derived model equation can be checked against the experimental results at various conditions. We find a very good agreement between theory and experiment and can confirm both, a linear diffusion controlled increase at the origin as well as an exponential tail of the pdf.

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