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Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_21:accueil [2023/03/19 19:11] – [À propos] ikrambeghdadi | public:modeles:rotor_21:accueil [2024/08/06 16:59] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Ligne 10: | Ligne 10: | ||
**[[https:// | **[[https:// | ||
</ | </ | ||
- | ===== Original model ===== | + | ===== About ===== |
Rotor 21 is part of a research program to study the experimental performances of a stage when the design blade loading in the rotor tip region has been substantially reduced. In | Rotor 21 is part of a research program to study the experimental performances of a stage when the design blade loading in the rotor tip region has been substantially reduced. In | ||
order to produce the same overall pressure ratio as a reference stage (rotor 11), the blade loading levels in the midspan portion of the present rotor blade had to be relatively high. | order to produce the same overall pressure ratio as a reference stage (rotor 11), the blade loading levels in the midspan portion of the present rotor blade had to be relatively high. | ||
- | * Original technical report [(cite: | + | * Original technical report [(cite: |
author | author | ||
date = {1978}, | date = {1978}, | ||
Ligne 27: | Ligne 27: | ||
- | <callout type=" | + | <callout type=" |
* [[https:// | * [[https:// | ||
- | * PDF of the NASA report : {{ : | + | * {{ : |
- | * CSV file of the blade geometry : {{ : | + | * {{ : |
</ | </ | ||
+ | |||
===== Reference blade ===== | ===== Reference blade ===== | ||
Ligne 44: | Ligne 45: | ||
===== Aerodynamic design | ===== Aerodynamic design | ||
- | ^ ^ unit ^ values | + | ^ ^ unit ^ value ^ |
^ pressure ratio | [-] | 1.57 | | ^ pressure ratio | [-] | 1.57 | | ||
^ mass flow | ^ mass flow | ||
Ligne 51: | Ligne 52: | ||
^ aspect ratio | [-] | 2.5 | | ^ aspect ratio | [-] | 2.5 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
===== Material properties | ===== Material properties | ||
- | The original material of the rotor 21 is not defined in the NASA report. | + | The original material of the rotor 21 is not defined in the NASA report. |
- | Considered properties: Ti-6Al-4V, generic titanium : | + | ^ |
- | + | ||
- | ^ | + | |
^ alloy | [-] | Ti-6Al-4V | ^ alloy | [-] | Ti-6Al-4V | ||
^ Young' | ^ Young' | ||
Ligne 75: | Ligne 74: | ||
</ | </ | ||
<col md=" | <col md=" | ||
- | {{: | + | {{ : |
< | < | ||
</ | </ | ||
<col md=" | <col md=" | ||
- | {{: | + | {{ : |
< | < | ||
</ | </ | ||
Ligne 93: | Ligne 92: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1512.88 | + | | 1 | 1B | 1512.88 |
- | | 2 | 2B | 5410.9 | 861.171 | | + | | 2 | 2B | 5410.90 | 861.17 | |
| 3 | 1T | 8729.48 | | 3 | 1T | 8729.48 | ||
+ | ====Campbell diagram==== | ||
+ | Evolution of the natural frequencies of the first 3 vibration modes, as a function of rotation speed, for the mesh computed with OpenMCAD[(cite: | ||
+ | |||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
===== Initial blade ===== | ===== Initial blade ===== | ||
Ligne 113: | Ligne 120: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1507.80 | + | | 1 | 1B | 1507.80 |
- | | 2 | 2B | 5410.47 | + | | 2 | 2B | 5410.47 |
| 3 | 1T | 8689.96 | | 3 | 1T | 8689.96 | ||
Ligne 121: | Ligne 128: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1507.89 | + | | 1 | 1B | 1507.89 |
- | | 2 | 2B | 5411.17 | + | | 2 | 2B | 5411.17 |
| 3 | 1T | 8691.72 | | 3 | 1T | 8691.72 | ||
+ | ====Campbell diagram==== | ||
+ | Comparison of the evolution of the natural frequencies of the first 3 vibration modes, as a function of rotation speed for the initial and the reference blade: | ||
+ | {{ : | ||
+ | |||
+ | |||
+ | < | ||
+ | |||
+ | initial blade (orange), reference blade (gray) </ | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
</ | </ | ||
Ligne 141: | Ligne 159: | ||
Le rotor 21 fait partie d'un programme de recherche visant à étudier les performances expérimentales d'un étage de soufflante lorsque la charge des aubes dans la région de l' | Le rotor 21 fait partie d'un programme de recherche visant à étudier les performances expérimentales d'un étage de soufflante lorsque la charge des aubes dans la région de l' | ||
- | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
author | author | ||
date = {1978}, | date = {1978}, | ||
Ligne 159: | Ligne 177: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 181: | Ligne 199: | ||
^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
===== Propriétés matériau | ===== Propriétés matériau | ||
- | Le matériau original du rotor 21 n'est pas défini dans le rapport de la NASA. | + | Le matériau original du rotor 21 n'est pas défini dans le rapport de la NASA. Un alliage de titane Ti-6Al-4v |
- | + | ||
- | Propriétés considérées : | + | |
^ | ^ | ||
Ligne 205: | Ligne 221: | ||
</ | </ | ||
<col md=" | <col md=" | ||
- | {{: | + | {{ : |
< | < | ||
</ | </ | ||
<col md=" | <col md=" | ||
- | {{: | + | {{ : |
< | < | ||
</ | </ | ||
Ligne 221: | Ligne 237: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
| 3 | 1T | 8729, | | 3 | 1T | 8729, | ||
+ | ====Diagramme de Campbell==== | ||
+ | Évolution des fréquences propres des 3 premiers modes, en fonction de la vitesse de rotation, pour le maillage obtenu avec OpenMCAD[(cite: | ||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | |||
+ | |||
===== Aube initiale ===== | ===== Aube initiale ===== | ||
Ligne 237: | Ligne 263: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
| 3 | 1T | 8689, | | 3 | 1T | 8689, | ||
Ligne 245: | Ligne 271: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
| 3 | 1T | 8691, | | 3 | 1T | 8691, | ||
+ | ====Diagramme de Campbell==== | ||
+ | Comparaison de l' | ||
+ | |||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | aube initiale (orange), aube de référence (grise)</ | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
- | </ | ||
</ | </ | ||
+ | </ | ||
- public/modeles/rotor_21/accueil.1679267481.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)