File:Effet Magnus inverse, Thom et Sengupta, ARC R&M 1520.png
![File:Effet Magnus inverse, Thom et Sengupta, ARC R&M 1520.png](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Effet_Magnus_inverse%2C_Thom_et_Sengupta%2C_ARC_R%26M_1520.png/481px-Effet_Magnus_inverse%2C_Thom_et_Sengupta%2C_ARC_R%26M_1520.png?20230304144054)
Original file (615 × 767 pixels, file size: 247 KB, MIME type: image/png)
Captions
Captions
Summary
[edit]DescriptionEffet Magnus inverse, Thom et Sengupta, ARC R&M 1520.png |
Français : Effet Magnus, dont effet inverse au pied de la courbe pour le plus fort Reynolds, Thom et Sengupta, ARC R&M 1520 |
Date | |
Source |
AIR TORQUE ON A CYLINDER ROTATING IN AN AIR STREAM, by A . Thom and S . R . Sengupta, ARC R&M N° 1520, 22nd October 1932 [1] |
Author | Thom et Sengupta |
Licensing
[edit]![]() ![]() |
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
Annotations InfoField | This image is annotated: View the annotations at Commons |
On observe bien dans ce rectangle un effet Magnus inverse pour les mesures effectuées au Reynolds diamétral du vent 93 000. Thom et Sengupta indiquent que cet effet Magnus inverse existe pour des Reynolds supérieurs à 70 000.
Si les coefficients de portance (nommés ici ) doivent être doublés pour dessiner notre coefficient de portance
moderne, les Reynolds sont bien les Reynolds diamétraux du vent qui sont usuels de nos jours.
Noter cette définition du qui sont bien établis en référence à la surface frontale
mais où manque le scalaire
présent dans la pression dynamique.
En conséquence, il faut multiplier par 2 ces pour obtenir nos modernes
.
On peut remarquer qu'aux rapports de vitesses moyens, la portance de Magnus des cylindres rugueux (ici enduits de sable) est du même ordre que la portance des cylindres lisses.
Par contre, Thom et Sengupta indiquent que le couple nécessaire à la rotation d'un cylindre rugueux est deux à trois fois plus fort que celui nécessaire à la rotation d'un cylindre lisse.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 14:40, 4 March 2023 | ![]() | 615 × 767 (247 KB) | Bernard de Go Mars (talk | contribs) | Uploaded a work by Thom et Sengupta from AIR TORQUE ON A CYLINDER ROTATING IN AN AIR STREAM, by A . Thom and S . R . Sengupta, ARC R&M N° 1520, 22nd October 1932 [https://babel.hathitrust.org/cgi/pt?id=wu.89031596224&view=1up&seq=217&q1=Thom] with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Horizontal resolution | 37.79 dpc |
---|---|
Vertical resolution | 37.79 dpc |