Différences
Ci-dessous, les différences entre deux révisions de la page.
| Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
| public:modeles:rotor_20:accueil [2023/03/19 22:29] – ikrambeghdadi | public:modeles:rotor_20:accueil [2024/08/06 16:58] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
|---|---|---|---|
| Ligne 14: | Ligne 14: | ||
| Rotor 20 is part of a research program to study the effect of tip velocity ratio on compressors performances. It has been designed for a stage tip velocity ratio of 0.8. | Rotor 20 is part of a research program to study the effect of tip velocity ratio on compressors performances. It has been designed for a stage tip velocity ratio of 0.8. | ||
| - | * Original technical report [(cite: | + | * Original technical report [(cite: |
| author | author | ||
| date = {1978}, | date = {1978}, | ||
| Ligne 32: | Ligne 32: | ||
| * [[https:// | * [[https:// | ||
| * {{ : | * {{ : | ||
| - | * {{ : | + | * {{ : |
| </ | </ | ||
| Ligne 54: | Ligne 54: | ||
| ^ 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 20 is not defined in the NASA report. | + | The original material of the rotor 20 is not defined in the NASA report. |
| - | + | ||
| - | Considered properties: | + | |
| ^ | ^ | ||
| Ligne 96: | Ligne 94: | ||
| ^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
| - | | 1 | 1B | 1374.86 | + | | 1 | 1B | 1374.86 |
| - | | 2 | 2B | 5070.79 | + | | 2 | 2B | 5070.79 |
| - | | 3 | 1T | 7887.28 | + | | 3 | 1T | 7887.28 |
| + | ====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 116: | Ligne 122: | ||
| ^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
| - | | 1 | 1B | 1375.47 | + | | 1 | 1B | 1375.47 |
| - | | 2 | 2B | 5066.25 | + | | 2 | 2B | 5066.25 |
| | 3 | 1T | 7896.27 | | 3 | 1T | 7896.27 | ||
| Ligne 124: | Ligne 130: | ||
| ^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
| - | | 1 | 1B | 1375.5 | + | | 1 | 1B | 1375.5 |
| - | | 2 | 2B | 5068.12 | + | | 2 | 2B | 5068.12 |
| | 3 | 1T | 7898.53 | | 3 | 1T | 7898.53 | ||
| + | ====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 143: | Ligne 160: | ||
| Le rotor 20 fait partie d'un programme de recherche visant à étudier l' | Le rotor 20 fait partie d'un programme de recherche visant à étudier l' | ||
| - | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
| author | author | ||
| date = {1978}, | date = {1978}, | ||
| Ligne 160: | Ligne 177: | ||
| * [[https:// | * [[https:// | ||
| * {{ : | * {{ : | ||
| - | * {{ : | + | * {{ : |
| </ | </ | ||
| Ligne 182: | Ligne 199: | ||
| ^ allongement | ^ allongement | ||
| ^ nombre d' | ^ nombre d' | ||
| - | ^ vitesse de rotation | + | ^ vitesse de rotation |
| ==== Propriétés matériau | ==== Propriétés matériau | ||
| - | Le matériau original du rotor 20 n'est pas défini dans le rapport de la NASA. | + | Le matériau original du rotor 20 n'est pas défini dans le rapport de la NASA. Un alliage de titane Ti-6Al-4v |
| - | + | ||
| - | Propriétés considérées : | + | |
| ^ | ^ | ||
| Ligne 222: | Ligne 237: | ||
| ^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
| - | | 1 | 1F | 1374, | + | | 1 | 1F | 1374, |
| - | | 2 | 2F | 5070, | + | | 2 | 2F | 5070, |
| - | | 3 | 1T | 7887, | + | | 3 | 1T | 7887, |
| + | ====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 239: | Ligne 264: | ||
| ^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
| - | | 1 | 1F | 1375, | + | | 1 | 1F | 1375, |
| - | | 2 | 2F | 5066, | + | | 2 | 2F | 5066, |
| | 3 | 1T | 7896, | | 3 | 1T | 7896, | ||
| Ligne 248: | Ligne 273: | ||
| ^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
| - | | 1 | 1F | 1375,5 | 218,917 | | + | | 1 | 1F | 1375,50 | 218,92 | |
| - | | 2 | 2F | 5068, | + | | 2 | 2F | 5068, |
| | 3 | 1T | 7898, | | 3 | 1T | 7898, | ||
| + | ====Diagramme de Campbell==== | ||
| + | Comparaison de l' | ||
| + | {{ : | ||
| + | < | ||
| - | </tabs> | + | aube initiale (orange), aube de référence (grise)</caption> |
| - | </pane> | + | |
| + | * {{ : | ||
| + | * {{ : | ||
| + | |||
| + | </ | ||
| + | </ | ||