File:Magnus effect, Rotating cylinder, NACA TM 323.png
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Summary
[edit]DescriptionMagnus effect, Rotating cylinder, NACA TM 323.png |
Français : Courbe donnant les coefficients de Portance et de Traînée d'un cylindre rotatif, ainsi que, en rouge, le rapport de la vitesse circonférentielle du cylindre à la vitesse de l'écoulement . |
Date | |
Source |
NACA TM N° 367, Application of the Magnus effect to the wind propulsion of ships, L. Prandtl [1] et : NACA TM 323 [NACA TM 323, Recent experiments at the göttingen aerodynamic institute, Ackeret [2] |
Author | Prandtl et Ackeret |
Licensing
[edit]Public domainPublic domainfalsefalse |
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Annotations InfoField | This image is annotated: View the annotations at Commons |
Ci-dessous est indiqué le rapport de la vitesse circonférentielle du cylindre à la vitesse de l'écoulement pour chacune des marques rouges de la courbe surlignée en bleu (ceci pour des disques d'extrémités de 140 mm).
Ici est dessinée la polaire d'une profil classique.
On peut mesurer ici la finesse maximale du profil classique : à peu près 15.
La finesse maximale du rotor est beaucoup plus faible que celle d'un profil classique. C'est sans doute pour cela que les essais de montage de rotors Magnus sur des avions ont été abandonnés (à cause de leur faible rendement énergétique).
Cette tangente donne la finesse à la portance maximale.
La courbe "c" est celle du même rotor, mais sans les disques d'extrémités...
Cette courbe "a" est surlignée en bleu.
Ce coefficient de portance est mesuré perpendiculairement à la vitesse de l'écoulement et à l'axe de rotation du cylindre.
Ce coefficient de traînée est mesuré parallèlement à la vitesse de l'écoulement et perpendiculairement à l'axe de rotation du cylindre.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 08:56, 10 November 2022 | 983 × 927 (325 KB) | Bernard de Go Mars (talk | contribs) | Correction de u/V = 2,2 en 2,7 | |
16:20, 8 November 2022 | 983 × 927 (324 KB) | Bernard de Go Mars (talk | contribs) | Uploaded a work by Prandtl et Ackeret from NACA TM N° 367, Application of the Magnus effect to the wind propulsion of ships, L. Prandtl [https://ntrs.nasa.gov/api/citations/19930090695/downloads/19930090695.pdf] et : NACA TM 323 [NACA TM 323, Recent experiments at the göttingen aerodynamic institute, Ackeret [https://ntrs.nasa.gov/api/citations/19930087110/downloads/19930087110.pdf] with UploadWizard |
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Horizontal resolution | 28.34 dpc |
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Vertical resolution | 28.34 dpc |