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Caractérisation expérimentale thermo-aéraulique d'un jet transverse impactant ou non, en turbulence de conduite

Abstract : This work consists in the experimental study of a jet in crossflow in a closed wind tunnel. Depending on the value of the velocity ratio r, this confined rectangular jet can interact or imping with the opposite wall from the one it issues. The jet is slightly heated (about 10°C) in order to stay in the passive scalar case. An improvement of the experimental facility has been done to obtain thermal boundary conditions compatible with the measurements of slight differences of temperature, imposed by the passive scalar. Concerning the metrology, hot and cold wire anemometry and thermometry are used, and all the anemometric devices are developped and built in the lab. Probes made with Wollaston wire (Pt-Rh) of 0,35µm diameter are coupled with an anemometer and a thermometer optimized to maximize the signal to noise ratio. The results are obtained both thanks to visualisations by fast camera shots for several velocity ratios (r between 3 and 12), and thanks to local hot and cold wire measurements, in the particular case of two velocity ratios (r=3.3 and 9.4). Mixing properties of the scalar are studied by the plot of statistical values of velocity and temperature in different plans, perpendicurlarly to the three axis. The analysis of spectral densities of the signals on several typical locations emphasizes some features of the dynamic behaviour of the jet.
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Submitted on : Monday, June 14, 2010 - 3:33:41 PM
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Pierre Fougairolle. Caractérisation expérimentale thermo-aéraulique d'un jet transverse impactant ou non, en turbulence de conduite. Physique [physics]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00491868⟩

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