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Experimental and numerical study of a confined variable density turbulent jet submitted to a strongly pulsed coflow

Bury, Yannick and Saudreau, Marc and Borée, Jacques and Charnay, Georges Experimental and numerical study of a confined variable density turbulent jet submitted to a strongly pulsed coflow. (2000) In: 3rd International Symposium on Turbulence, Heat and Mass Transfer, 02-06 Apr 2000, Nagoya, Japan .

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Abstract

An experimental and numerical work dedicated to the study of a confined variable density jet subjected to a time-varying coflow with high acceleration/deceleration levels is presented in this paper. A global analysis and a hyperbolic model based on momentum equation written for the centerline excess velocity are first developped to obtain physical understanding and to estimate relevant effects governing such a complex unsteady flow. In order to observe the jet as it interacts with the main flow and to quantify those effects, two-component laser Doppler velocimetry and optical concentration measurements based on Mie scattering are used and adapted to unsteady conditions. Light, heavy and air jets are successively studied. During acceleration phases, convective phenomena govern part of the flow and a front formation appears which strength increases as initial jet density is lower. This front propagates at a constant velocity and deeply modifies mixing processes and mass transfer in comparison with steady coflowing jet. Comparisons with RANS numerical simulations using k-eps model are presented. Agreement with measurements of longitudinal velocity field is acceptable.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Yannick Bury

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