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File:Mesure de pression sur une paroi circulaire de jet pariétal.png

Mesure_de_pression_sur_une_paroi_circulaire_de_jet_pariétal.png ‎(354 × 251 pixels, file size: 120 KB, MIME type: image/png)

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Français : Mesure des pressions sur une paroi circulaire de rayon r = 12 cm déviant ou non un jet pariétal de nombre de Reynolds 106 et de largeur h.

Si le rapport h/r de la largeur du jet dévié au rayon est supérieur à 0,5, la pression commence par chuter sur un angle de 9° (installation d'un gradient transversal), puis remonte jusqu'à la pression ambiante, à nouveau sur un angle de 9° au point où le jet décolle de la paroi : on n’observe que cet effet local qui n’est pas un effet Coanda. Un angle additionnel de déviation qui est un effet Coanda véritable apparaît dans une zone intermédiaire à pression d’autant plus constante que h/r est inférieur à 0,25, comme dans un jet pariétal, excepté que la couche limite du jet soumis à cette pression décolle de la paroi..

Expériences effectuées par l'auteur et par J. Liermann dans le laboratoire de l'auteur à la SNECMA, publiées dans: Kadosch M., "Déviation d'un jet par adhérence à une paroi convexe" in: Journal de Physique et Le Radium, avril 1958, Paris, p.9A]]
English: Measuring surface pressure along a circular wall of radius r = 12 cm, deflecting a jet Reynolds number 106 of width h. The pressure begins to decrease due to the transverse gradient to an angle 9° along the wall, then remains constant if the h/r ratio of the width of the jet to the radius is less than 0.25 along an additional angle which is "true Coandă effect", and finally increases back to the ambient pressure again over another angle 9°. If the h/r ratio is more than 0.5, the local effects 2 x 9° only occur and there is "no true Coandă effect". Experiments made by the author and J. Liermann in the laboratory of the author, SNECMA, published in: Kadosch M., "Déviation d'un jet par adhérence à une paroi convexe" in: Journal de Physique et Le Radium, avril 1958, Paris, p.9A.
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Author Marcel kadosch

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