Comparison between two models of cooling surfaces using blowing.
To protect surfaces against high temperatures, the blowing through a porous material is studied. The geometry is that of a circular cylinder in cross-flow and the effectiveness of the blowing for the thermal protection is numerically investigated. Two models are developed for the blowing simulation and comparisons are made with experimental data obtained in a heated wind-tunnel. It is shown that the blowing strongly affects the dynamical and thermal profiles over the surface, thickening the boundary layers and decreasing the external transfer coefficients. It results in a lower viscous drag and thermal stress. The wall temperature dramatically decreases with blowing and the heat flux is also affected.
Mathelin
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Institut National des Sciences Appliquées de Lyon Centre de Thermique de Lyon, UMR 5008 Bât. 404, 20 av. A. Einstein, 69621 Villeurbanne, France.
Bataille
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F
Lallemand
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A