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File:Cx du cylindre aux limites de la compressibilité, Gowen & Perkins, NACA TN 2960.png

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Cd of the cylinder at the limits of compressibility, according to Gowen & Perkins (NACA TN 2960)

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Français : Cx du cylindre aux limites de la compressibilité, d'après Gowen & Perkins (NACA TN 2960). Les courbes noires les plus basses dessinent le Cx classique du cylindre en fonction de son Reynolds (voir la courbe bleue de [Comparaison_Cx_sphère_et_cylindre.png]. Les courbes rouges montrent ce qu’il advient du Cx du cylindre lorsque, afin d’augmenter le Reynolds, on augmente la vitesse de l’écoulement au-delà de M 0,3 : l’écoulement ressent les effets de la compressibilité de l’air, ce qui conduit le Cx à croître vertigineusement. De la sorte, on accroît bien un peu le Reynolds, mais c’est surtout le Cx qui décolle !
English: Cd of the cylinder at the limits of compressibility, according to Gowen & Perkins (NACA TN 2960). The lower black curves draw the classical Cd of the cylinder versus its Reynolds (see the blue curve of [Comparison_Cx_sphere_and_cylinder.png] .The red curves show what happens to the Cd of the cylinder when, in order to increase the Reynolds, the flow velocity is increased beyond M 0.3: the flow feels the effects of compressibility of the air, which causes the Cd to grow vertiginously, thus increasing a little bit more the Reynolds, but it's especially the Cd that takes off!
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Author Bernard de Go Mars

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