File:Cn d'un missile à panneaux cellulaires selon roulis.png
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[edit]DescriptionCn d'un missile à panneaux cellulaires selon roulis.png |
Français : d'un missile à panneaux cellulaires selon roulis, d'après Timothy Wayne Ledlow II dans sa thèse Integration of Grid Fins for the Optimal Design of Missile Systems [1].
English: of a missile with grid fins depending on roll angle, according to Timothy Wayne Ledlow II in his thesis Integration of Grid Fins for the Optimal Design of Missile Systems /Ledlow_Thesis.pdf;sequence=2. |
Date | |
Source | Own work |
Author | Bernard de Go Mars |
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Annotations InfoField | This image is annotated: View the annotations at Commons |
Le est le coefficient de portance normale adimensionnalisé (ici par la Pression Dynamique et la section du fuselage comme surface de référence). Ici, c'est bien la totalité des forces normales (générées par l'ogive, le fuselage et les panneaux cellulaires) qui est prise en compte.
On observe que les courbes pour les roulis 22,5 et 67,5° sont identiques : à ces angles de roulis, l'engin se présente de façon symétrique par rapport au plan de l'incidence (par symétrie, les doivent donc être identiques ; quand ils ne le sont pas, comme autour de l'incidence 2°, cela est dû à une imprécision des tests).
La position en x (roulis 45°) dégage le panneau supérieur des turbulences de sillage du fuselage : c'est sans doute pourquoi le total en ressort comme légèrement plus fort...
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