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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_14:accueil [2023/03/19 22:13] – ikrambeghdadi | public:modeles:rotor_14:accueil [2024/08/05 15:55] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Rotor 14 is part of a research program to study the effects of blade row solidity on efficiency and stall margin of an axial-flow compressor rotor. It is one of a series of rotors designed to further study the effects of solidity : rotor 8 with a tip solidity of 1.5, rotor 12 with a tip solidity of 1.7 and rotor 14 with a tip solidity of 1.3. 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. | Rotor 14 is part of a research program to study the effects of blade row solidity on efficiency and stall margin of an axial-flow compressor rotor. It is one of a series of rotors designed to further study the effects of solidity : rotor 8 with a tip solidity of 1.5, rotor 12 with a tip solidity of 1.7 and rotor 14 with a tip solidity of 1.3. 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 33: | Ligne 33: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 55: | Ligne 55: | ||
^ aspect ratio | [-] | 2.4 | | ^ aspect ratio | [-] | 2.4 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
==== Material properties | ==== Material properties | ||
- | The original material of the rotor 14 is not defined in the NASA report. | + | The original material of the rotor 14 is not defined in the NASA report. |
- | + | ||
- | Considered properties: | + | |
^ | ^ | ||
Ligne 98: | Ligne 96: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1739.36 | + | | 1 | 1B | 1739.36 |
- | | 2 | 2B | 6240.69 | + | | 2 | 2B | 6240.69 |
| 3 | 1T | 8434.99 | | 3 | 1T | 8434.99 | ||
+ | ====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 118: | Ligne 128: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1739.44 | + | | 1 | 1B | 1739.44 |
| 2 | 2B | 6259.56 | | 2 | 2B | 6259.56 | ||
| 3 | 1T | 8425.56 | | 3 | 1T | 8425.56 | ||
Ligne 126: | Ligne 136: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1739.51 | + | | 1 | 1B | 1739.51 |
- | | 2 | 2B | 6261.91 | + | | 2 | 2B | 6261.91 |
| 3 | 1T | 8428.64 | | 3 | 1T | 8428.64 | ||
+ | ====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 145: | Ligne 166: | ||
Le rotor 14 fait partie d'un programme de recherche visant à étudier les effets de la solidité des rangées d' | Le rotor 14 fait partie d'un programme de recherche visant à étudier les effets de la solidité des rangées d' | ||
- | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
author | author | ||
date = {1972}, | date = {1972}, | ||
Ligne 164: | Ligne 185: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 186: | Ligne 207: | ||
^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
==== Propriétés matériau | ==== Propriétés matériau | ||
- | Le matériau original du rotor 14 n'est pas défini dans le rapport de la NASA. | + | Le matériau original du rotor 14 n'est pas défini dans le rapport de la NASA. Un acier maraging de grade 200 est considéré: |
- | + | ||
- | Propriétés considérées : un acier maraging de grade 200 : | + | |
^ | ^ | ||
Ligne 227: | Ligne 246: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1739, | + | | 1 | 1F | 1739, |
- | | 2 | 2F | 6240, | + | | 2 | 2F | 6240, |
| 3 | 1T | 8434, | | 3 | 1T | 8434, | ||
+ | ====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 243: | Ligne 272: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1739, | + | | 1 | 1F | 1739, |
| 2 | 2F | 6259, | | 2 | 2F | 6259, | ||
| 3 | 1T | 8425, | | 3 | 1T | 8425, | ||
Ligne 251: | Ligne 280: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1739, | + | | 1 | 1F | 1739, |
- | | 2 | 2F | 6261, | + | | 2 | 2F | 6261, |
| 3 | 1T | 8428, | | 3 | 1T | 8428, | ||
+ | ====Diagramme de Campbell==== | ||
+ | Comparaison de l' | ||
- | </tabs> | + | {{ : |
- | </pane> | + | <caption>diagramme de Campbell calculé avec une précharge centrifuge linéaire, noeuds du pied d'aube encastrés (vitesse nominale ωₙ = 1 686 rad/s), |
+ | aube initiale (orange), aube de référence (grise)</ | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | </ | ||
+ | </ | ||
- public/modeles/rotor_14/accueil.1679278418.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)