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Theses

Mise en oeuvre de la Fluorescence Induite par Laser couplée à la Vélocimétrie Laser à effet Doppler. Application à l'étude et à la modélisation des propriétés diffusionnelles des écoulements turbulents

Abstract : This thesis presents the experimental study of the diffusion of passive scalar in turbulent flows using two combined optical and non-intrusive methods : the Laser-Induced Fluorescence and the Laser Doppler Velocimetry. This technique allows the simultaneous and instantaneous determination of velocity and concentration or temperature in the same probe volume, with spatial and temporal resolutions congruent with the characteristic scales of turbuence. The dependance of the fluorescence signal on the concentration and on the temperature has been modelled and the experimental conditions of use of this technique developed. This technique has been implemented first in a homgeneous and isotropic grid generated turbuelent flow. It has been shown that a constant turbulent diffusivity could be defined. Then we proposed the experimental study of thr turbulent transport in an axisymmetric jet. The experimental results yielded the validation of second order closure models for the transport equations of thr Reynolds stress and for the transport equation of the radial turbulent mass flux. It has been checked out that a constant turbulent Schmidt number could be defined in the centre of the flow. Finally, the extension of this technique to the simultaneous measurements of temperature and velocity has been pointed out that the values of turbuelent Prandtl number and the turbulent Schmidt number measured for the isothermal jet were of the same order magnitude in the fully developped region of the flow.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_1999_0047_ANTOINE.pdf
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https://hal.univ-lorraine.fr/tel-01747074
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Submitted on : Thursday, March 29, 2018 - 10:50:34 AM
Last modification on : Thursday, January 14, 2021 - 11:15:00 AM

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  • HAL Id : tel-01747074, version 1

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Yan Antoine. Mise en oeuvre de la Fluorescence Induite par Laser couplée à la Vélocimétrie Laser à effet Doppler. Application à l'étude et à la modélisation des propriétés diffusionnelles des écoulements turbulents. Autre. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10047⟩. ⟨tel-01747074⟩

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