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Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_74a2:accueil [2023/04/02 17:35] – [Material properties] ikrambeghdadi | public:modeles:rotor_74a2:accueil [2024/08/02 10:27] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Compressor 74A is part of a research program to study fans and compressors for advanced airbreathing engines to assess and improve the technology needed for high pressure ratio, good efficiency, and adequate stall margin in as few stages as possible. This compressor consists of inlet guide vanes and five stages, and it is designed for a 9.271 pressure ratio. Rotor 74A2 is the rotor of the second stage of this compressor. | Compressor 74A is part of a research program to study fans and compressors for advanced airbreathing engines to assess and improve the technology needed for high pressure ratio, good efficiency, and adequate stall margin in as few stages as possible. This compressor consists of inlet guide vanes and five stages, and it is designed for a 9.271 pressure ratio. Rotor 74A2 is the rotor of the second stage of this compressor. | ||
- | * Original technical report [(cite: | + | * Original technical report [(cite: |
author | author | ||
date = {1986}, | date = {1986}, | ||
Ligne 24: | Ligne 24: | ||
</ | </ | ||
- | <fc #ff0000> | + | * Picture : |
- | | + | {{ : |
+ | <caption> | ||
+ | * < | ||
+ | author | ||
+ | title = {74A Compressor. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
+ | year = {1978}, | ||
+ | url = {https:// | ||
+ | </code> | ||
Ligne 34: | Ligne 40: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
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==== Aerodynamic design | ==== Aerodynamic design | ||
- | ^ ^ | + | ^ ^ |
^ pressure ratio | [-] | 1.691 | | ^ pressure ratio | [-] | 1.691 | | ||
^ mass flow | ^ mass flow | ||
Ligne 55: | Ligne 61: | ||
^ aspect ratio | [-] | 1.17 | | ^ aspect ratio | [-] | 1.17 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
==== Material properties | ==== Material properties | ||
- | Rotor 74A2 is made of titanium according to the NASA report, but the exact properties are not provided. | + | Rotor 74A2 is made of titanium according to the NASA report, but the exact properties are not provided. |
- | Considered properties: Ti-6Al-4V, generic titanium : | + | ^ |
- | + | ||
- | ^ | + | |
^ alloy | [-] | Ti-6Al-4V | ^ alloy | [-] | Ti-6Al-4V | ||
^ Young' | ^ Young' | ||
Ligne 97: | Ligne 101: | ||
First three natural frequencies (with clamped root) for the mesh computed with OpenMCAD[(cite: | First three natural frequencies (with clamped root) for the mesh computed with OpenMCAD[(cite: | ||
- | ^ Mode ^ Type ^ Natural angular frequency (rad/ | + | ^ Mode ^ Type ^ Natural angular frequency (rad/ |
- | | 1 | 1B | 4884.844 | + | | 1 |
- | | 2 | + | | 2 |
- | | 3 | 2B | 17870.82 | + | | 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 ===== | ||
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* from the whole mesh: | * from the whole mesh: | ||
- | ^ Mode ^ Type ^ Natural angular frequency (rad/ | + | ^ Mode ^ Type ^ Natural angular frequency (rad/ |
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
- | | 3 | + | | 3 |
* from the reduced order model: | * from the reduced order model: | ||
- | ^ 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) </ | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
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===== À propos ===== | ===== À propos ===== | ||
- | Le compresseur 74A fait partie d'un programme de recherche visant à étudier les soufflantes et les compresseurs pour les moteurs | + | Le compresseur 74A fait partie d'un programme de recherche visant à étudier les soufflantes et les compresseurs pour des moteurs |
- | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
author | author | ||
date = {1986}, | date = {1986}, | ||
Ligne 155: | Ligne 179: | ||
} | } | ||
</ | </ | ||
- | <fc #ff0000> | ||
- | * Photographies</ | ||
+ | * Photographie : | ||
+ | {{ : | ||
+ | < | ||
+ | * < | ||
+ | author | ||
+ | title = {74A Compressor. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
+ | year = {1978}, | ||
+ | url = {https:// | ||
+ | </ | ||
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* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
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^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
==== Propriétés matériau | ==== Propriétés matériau | ||
- | Le matériau du rotor 74A2 est le titane d' | + | Le matériau du rotor 74A2 est le titane d' |
- | Propriétés considérées : alliage Ti-6Al-4V | ||
^ | ^ | ||
Ligne 224: | Ligne 254: | ||
Fréquences des trois premiers modes (noeuds du pied d'aube encastrés) pour le maillage obtenu avec OpenMCAD[(cite: | Fréquences des trois premiers modes (noeuds du pied d'aube encastrés) pour le maillage obtenu avec OpenMCAD[(cite: | ||
- | ^ Mode ^ Type ^ Pulsation propre (rad/ | + | ^ Mode ^ Type ^ Pulsation propre (rad/ |
- | | 1 | + | | 1 |
- | | 2 | 1T | 15222, | + | | 2 | 1T | 15222, |
- | | 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 241: | Ligne 281: | ||
* pour le maillage complet : | * pour le maillage complet : | ||
- | ^ Mode ^ Type ^ Pulsation propre (rad/ | + | ^ Mode ^ Type ^ Pulsation propre (rad/ |
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
- | | 3 | + | | 3 |
Ligne 250: | Ligne 290: | ||
* pour le modèle réduit : | * pour le modèle réduit : | ||
- | ^ 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)</ | ||
+ | * {{ : | ||
+ | * {{ : | ||
</ | </ | ||
</ | </ |
- public/modeles/rotor_74a2/accueil.1680471330.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)