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Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_74a1:accueil [2023/04/02 00:05] – ikrambeghdadi | public:modeles:rotor_74a1:accueil [2024/08/02 10:11] (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 74A1 is the rotor of the first 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 74A1 is the rotor of the first stage of this compressor. | ||
- | * Original technical report [(cite: | + | * Original technical report [(cite: |
author | author | ||
date = {1986}, | date = {1986}, | ||
Ligne 24: | Ligne 24: | ||
</ | </ | ||
- | * <fc # | ||
+ | * Picture : | ||
+ | {{ : | ||
+ | < | ||
+ | * < | ||
+ | author | ||
+ | title = {74A Compressor. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
+ | year = {1978}, | ||
+ | url = {https:// | ||
+ | </ | ||
<callout type=" | <callout type=" | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 45: | Ligne 53: | ||
==== Aerodynamic design | ==== Aerodynamic design | ||
- | ^ ^ | + | ^ ^ |
^ pressure ratio | [-] | 1.792 | | ^ pressure ratio | [-] | 1.792 | | ||
^ mass flow | ^ mass flow | ||
Ligne 52: | Ligne 60: | ||
^ aspect ratio | [-] | 1.45 | | ^ aspect ratio | [-] | 1.45 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
==== Material properties | ==== Material properties | ||
- | Rotor 74A1 is made of titanium according to the NASA report, but the exact properties are not provided. | + | Rotor 74A1 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 93: | Ligne 99: | ||
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 | 2641.294 | + | | 1 | 1B | 2641.29 | 420.38 | |
- | | 2 | 1T | + | | 2 | 1T | 8553.90 | 1361.40 |
- | | 3 | 2B | 12096.58 | + | | 3 | 2B | 12096.58 |
+ | ====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 127: | ||
* from the whole mesh: | * from the whole mesh: | ||
- | ^ Mode ^ Type ^ Natural angular frequency (rad/ | + | ^ Mode ^ Type ^ Natural angular frequency (rad/ |
- | | 1 | 1B | | + | | 1 | 1B | 2643.86 |
- | | 2 | 1T | | + | | 2 | 1T | 8552.99 |
- | | 3 | 2B | | + | | 3 | 2B | 12094.50 |
* from the reduced order model: | * from the reduced order model: | ||
- | ^ Mode ^ Type ^ Natural angular frequency (rad/ | + | ^ Mode ^ Type ^ Natural angular frequency (rad/ |
- | | 1 | 1B | 2644.184 | + | | 1 | 1B | 2644.18 | 420.84 | |
- | | 2 | 1T | 8561.84 | + | | 2 | 1T | 8561.84 |
- | | 3 | 2B | 12104.24 | + | | 3 | 2B | 12104.24 |
+ | |||
+ | |||
+ | ====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 151: | Ligne 179: | ||
</ | </ | ||
- | * <fc #ff0000>photographies | + | * Photographie : |
+ | {{ : | ||
+ | <caption>Fig. 1 https:// | ||
+ | * < | ||
+ | author | ||
+ | title = {74A Compressor. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
+ | year = {1978}, | ||
+ | url = {https:// | ||
+ | </code> | ||
Ligne 157: | Ligne 193: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 178: | Ligne 214: | ||
^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
==== Propriétés matériau | ==== Propriétés matériau | ||
- | Le matériau du rotor 74A1 est le titane d' | + | Le matériau du rotor 74A1 est le titane d' |
- | Propriétés considérées : allaige Ti-6Al-4V | ||
- | ^ | + | ^ |
^ alliage | ^ alliage | ||
^ module d' | ^ module d' | ||
Ligne 216: | Ligne 251: | ||
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 | + | | 2 | 1T | 8553,90 | 1361,40 |
- | | 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 232: | Ligne 277: | ||
* pour le maillage complet : | * pour le maillage complet : | ||
- | ^ Mode ^ Type ^ Pulsation propre (rad/ | + | ^ Mode ^ Type ^ Pulsation propre (rad/ |
- | | 1 | + | | 1 |
- | | 2 | 1T | | + | | 2 | 1T | 8552, |
- | | 3 | + | | 3 |
* pour le modèle réduit : | * pour le modèle réduit : | ||
- | ^ Mode ^ Type ^ Pulsation propre (rad/ | + | ^ Mode ^ Type ^ Pulsation propre (rad/ |
- | | 1 | + | | 1 |
- | | 2 | 1T | 8561, | + | | 2 | 1T | 8561, |
- | | 3 | + | | 3 |
+ | |||
+ | ====Diagramme de Campbell==== | ||
+ | Comparaison de l' | ||
+ | |||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | aube initiale (orange), aube de référence (grise)</ | ||
+ | * {{ : | ||
+ | * {{ : | ||
</ | </ | ||
</ | </ |
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- Dernière modification : 2023/04/05 08:59
- (modification externe)