Différences
Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_08:accueil [2023/03/19 21:13] – [Aerodynamic design] ikrambeghdadi | public:modeles:rotor_08:accueil [2024/08/05 15:51] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Rotor 8 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 8 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 = {1973}, | date = {1973}, | ||
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* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
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The **reference blade** is defined with multiple-circular arc profiles[(cite: | The **reference blade** is defined with multiple-circular arc profiles[(cite: | ||
- | ===== Geometry | + | ==== Geometry ==== |
The geometry of rotor 8 is described in the [[https:// | The geometry of rotor 8 is described in the [[https:// | ||
Ligne 47: | Ligne 47: | ||
{{ : | {{ : | ||
- | ===== Aerodynamic design | + | ==== Aerodynamic design |
^ ^ unit ^ value ^ | ^ ^ unit ^ value ^ | ||
Ligne 56: | Ligne 56: | ||
^ aspect ratio | [-] | 2.4 | | ^ aspect ratio | [-] | 2.4 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
- | ===== Material properties | + | ==== Material properties |
The material of rotor 8 is not defined in the original NASA report. A generic titanium Ti-6Al-4V is considered: | The material of rotor 8 is not defined in the original NASA report. A generic titanium Ti-6Al-4V is considered: | ||
- | ^ | + | ^ |
^ alloy | [-] | Ti-6Al-4V | ^ alloy | [-] | Ti-6Al-4V | ||
^ Young' | ^ Young' | ||
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^ 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: | ||
+ | |||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
Ligne 117: | Ligne 125: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1778.69 | + | | 1 | 1B | 1778.69 |
| 2 | 2B | 6413.56 | | 2 | 2B | 6413.56 | ||
| 3 | 1T | 8747.83 | | 3 | 1T | 8747.83 | ||
Ligne 124: | Ligne 132: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1778.75 | + | | 1 | 1B | 1778.75 |
| 2 | 2B | 6416.20 | | 2 | 2B | 6416.20 | ||
| 3 | 1T | 8750.91 | | 3 | 1T | 8750.91 | ||
+ | ====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 162: | Ligne 181: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 171: | Ligne 190: | ||
L' | L' | ||
- | ===== Géométrie | + | ==== Géométrie ==== |
La géométrie du rotor 8 est décrite dans le [[https:// | La géométrie du rotor 8 est décrite dans le [[https:// | ||
Ligne 177: | Ligne 196: | ||
{{ : | {{ : | ||
- | ===== Caractéristiques aérodynamiques | + | ==== Caractéristiques aérodynamiques |
^ ^ unités | ^ ^ unités | ||
^ taux de compression | ^ taux de compression | ||
Ligne 185: | Ligne 204: | ||
^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
- | ===== Propriétés matériau | + | ==== Propriétés matériau |
Le matériau original du rotor 8 n'est pas défini dans le rapport de la NASA. Un alliage de titane Ti-6Al-4v est considéré: | Le matériau original du rotor 8 n'est pas défini dans le rapport de la NASA. Un alliage de titane Ti-6Al-4v est considéré: | ||
Ligne 225: | Ligne 244: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1779, | + | | 1 | 1F | 1779, |
| 2 | 2F | 6407, | | 2 | 2F | 6407, | ||
- | | 3 | 1T | 8746, | + | | 3 | 1T | 8746, |
+ | ====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 270: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1778, | + | | 1 | 1F | 1778, |
| 2 | 2F | 6413, | | 2 | 2F | 6413, | ||
| 3 | 1T | 8747, | | 3 | 1T | 8747, | ||
Ligne 249: | Ligne 278: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1778, | + | | 1 | 1F | 1778, |
| 2 | 2F | 6416, | | 2 | 2F | 6416, | ||
| 3 | 1T | 8750, | | 3 | 1T | 8750, | ||
+ | ====Diagramme de Campbell==== | ||
+ | Comparaison de l' | ||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | aube initiale (orange), aube de référence (grise)</ | ||
+ | * {{ : | ||
+ | * {{ : | ||
</ | </ | ||
- public/modeles/rotor_08/accueil.1679274824.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)