Différences
Ci-dessous, les différences entre deux révisions de la page.
| Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
| public:modeles:rotor_05:accueil [2023/03/28 09:38] – solenekojtych | public:modeles:rotor_05:accueil [2024/08/05 15:46] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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| Ligne 17: | Ligne 17: | ||
| Then, another series of tests has been conducted with blade tip solidities of 1.3 (rotor 14), 1.5 (rotor 8), and 1.7 (rotor 12). Tip solidity are being changed by varying the number of blades while maintaining the same velocity diagrams and flow path. These stages were designed such that the tip solidity of both the rotor and stator blades are the same. | Then, another series of tests has been conducted with blade tip solidities of 1.3 (rotor 14), 1.5 (rotor 8), and 1.7 (rotor 12). Tip solidity are being changed by varying the number of blades while maintaining the same velocity diagrams and flow path. These stages were designed such that the tip solidity of both the rotor and stator blades are the same. | ||
| - | * Original technical report [(cite: | + | * Original technical report [(cite: |
| author | author | ||
| date = {1972}, | date = {1972}, | ||
| Ligne 56: | Ligne 56: | ||
| ^ aspect ratio | [-] | 2.3 | | ^ aspect ratio | [-] | 2.3 | | ||
| ^ number of blades | ^ number of blades | ||
| - | ^ rotative | + | ^ nominal rotation |
| ==== Material properties | ==== Material properties | ||
| - | Rotor 5 is made of a 200-grade maraging steel | + | Rotor 3 is made of a 200-grade maraging steel, but the exact material properties are not provided in the NASA report. The following properties are considered : |
| ^ | ^ | ||
| Ligne 97: | Ligne 97: | ||
| ^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
| - | | 1 | + | | 1 |
| | 2 | | 2 | ||
| - | | 3 | + | | 3 |
| + | ====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 124: | Ligne 132: | ||
| ^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
| - | | 1 | + | | 1 |
| | 2 | | 2 | ||
| | 3 | | 3 | ||
| + | ====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 150: | Ligne 168: | ||
| Ensuite, une autre série d' | Ensuite, une autre série d' | ||
| - | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
| author | author | ||
| date = {1972}, | date = {1972}, | ||
| Ligne 191: | Ligne 209: | ||
| ^ allongement | ^ allongement | ||
| ^ nombre d' | ^ nombre d' | ||
| - | ^ vitesse de rotation | + | ^ vitesse de rotation |
| ==== Propriétés matériau | ==== Propriétés matériau | ||
| - | Le matériau | + | Le matériau du rotor 5 est un alliage à base de nickel : un acier maraging de grade 200, mais ses caractéristiques ne sont pas fournies. Les propriétés considérées sont : |
| ^ | ^ | ||
| Ligne 231: | Ligne 249: | ||
| ^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
| - | | 1 | + | | 1 |
| | 2 | | 2 | ||
| - | | 3 | + | | 3 |
| + | ====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 255: | Ligne 279: | ||
| ^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
| - | | 1 | + | | 1 |
| | 2 | | 2 | ||
| | 3 | | 3 | ||
| + | ====Diagramme de Campbell==== | ||
| + | Comparaison de l' | ||
| + | {{ : | ||
| + | < | ||
| + | |||
| + | aube initiale (orange), aube de référence (grise)</ | ||
| + | * {{ : | ||
| + | * {{ : | ||
| </ | </ | ||
| </ | </ | ||