Différences
Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_04:accueil [2023/03/19 20:27] – [Fréquences propres] ikrambeghdadi | public:modeles:rotor_04:accueil [2024/08/05 15:45] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Ligne 12: | Ligne 12: | ||
</ | </ | ||
- | ===== Original model ===== | + | ===== About ===== |
Rotor 4 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 with varying blade solidity achieved by changing the blade chord length : rotor 3 with a tip solidity of 1.3, rotor 4 with a tip solidity of 1.1 and rotor 5 with a tip solidity of 1.5. The results showed that the efficiency and pressure ratio were higher for a rotor with a blade tip solidity of 1.5 than for a rotor with a solidity of 1.1. | Rotor 4 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 with varying blade solidity achieved by changing the blade chord length : rotor 3 with a tip solidity of 1.3, rotor 4 with a tip solidity of 1.1 and rotor 5 with a tip solidity of 1.5. The results showed that the efficiency and pressure ratio were higher for a rotor with a blade tip solidity of 1.5 than for a rotor with a solidity of 1.1. | ||
Ligne 19: | Ligne 19: | ||
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 39: | Ligne 39: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 47: | Ligne 47: | ||
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 4 is described in the [[https:// | The geometry of rotor 4 is described in the [[https:// | ||
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- | ===== Aerodynamic design | + | ==== Aerodynamic design |
- | ^ ^ unit ^ values | + | ^ ^ unit ^ value ^ |
^ pressure ratio | [-] | 1.8 | | ^ pressure ratio | [-] | 1.8 | | ||
^ mass flow | ^ mass flow | ||
Ligne 62: | Ligne 62: | ||
^ aspect ratio | [-] | 3 | | ^ aspect ratio | [-] | 3 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
- | ===== Material properties | + | ==== Material properties |
- | Rotor 4 is made of a 200-grade maraging steel | ||
- | ^ | + | Rotor 4 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 : |
+ | |||
+ | ^ | ||
^ alloy | [-] | 18-Ni-200-maraging | ^ alloy | [-] | 18-Ni-200-maraging | ||
^ Young' | ^ Young' | ||
Ligne 85: | Ligne 86: | ||
<col md=" | <col md=" | ||
{{ : | {{ : | ||
- | < | + | < |
</ | </ | ||
<col md=" | <col md=" | ||
{{ : | {{ : | ||
- | < | + | < |
</ | </ | ||
<col md=" | <col md=" | ||
Ligne 101: | Ligne 102: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1678.08 | + | | 1 | 1B | 1678.08 |
| 2 | 2B | 6508.62 | | 2 | 2B | 6508.62 | ||
| 3 | 1T | 8874.56 | | 3 | 1T | 8874.56 | ||
+ | ====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 110: | Ligne 119: | ||
===== Initial blade ===== | ===== Initial blade ===== | ||
- | The **initial blade** is defined with in-house LAVA parameters[(cite: | + | The **initial blade** is defined with in-house LAVA parameters[(cite: |
Ligne 122: | Ligne 131: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 1682.55 | + | | 1 | 1B | 1682.55 |
| 2 | 2B | 6515.28 | | 2 | 2B | 6515.28 | ||
| 3 | 1T | 8895.29 | | 3 | 1T | 8895.29 | ||
Ligne 134: | Ligne 143: | ||
| 3 | 1T | 8897.12 | | 3 | 1T | 8897.12 | ||
+ | |||
+ | ====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 172: | ||
Ensuite, une autre série d' | Ensuite, une autre série d' | ||
- | * Rapport technique original [(cite: | + | * Rapport technique original[(cite: |
@TechReport{janetzke1972design, | @TechReport{janetzke1972design, | ||
author | author | ||
Ligne 169: | Ligne 191: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
Ligne 177: | Ligne 199: | ||
- | ===== Géométrie | + | ==== Géométrie ==== |
La géométrie du rotor 4 est décrite dans le [[https:// | La géométrie du rotor 4 est décrite dans le [[https:// | ||
Ligne 183: | Ligne 205: | ||
{{ : | {{ : | ||
- | ===== Caractéristiques aérodynamiques | + | ==== Caractéristiques aérodynamiques |
^ ^ unités | ^ ^ unités | ||
^ taux de compression | ^ taux de compression | ||
Ligne 191: | Ligne 213: | ||
^ allongement | ^ allongement | ||
^ nombre d' | ^ nombre d' | ||
- | ^ vitesse de rotation | + | ^ vitesse de rotation |
- | ===== Propriétés matériau | + | ==== Propriétés matériau |
- | Le matériau | + | Le matériau du rotor 4 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 253: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | + | | 1 |
- | | 2 | + | | 2 |
| 3 | 1T | 8874, | | 3 | 1T | 8874, | ||
+ | |||
+ | ====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 246: | Ligne 279: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 1682, | + | | 1 | 1F | 1682, |
| 2 | 2F | 6515, | | 2 | 2F | 6515, | ||
| 3 | 1T | 8895, | | 3 | 1T | 8895, | ||
Ligne 258: | Ligne 291: | ||
| 3 | 1T | 8897, | | 3 | 1T | 8897, | ||
+ | ====Diagramme de Campbell==== | ||
+ | Comparaison de l' | ||
+ | {{ : | ||
+ | < | ||
- | </tabs> | + | aube initiale (orange), aube de référence (grise)</caption> |
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
</ | </ | ||
+ | </ | ||
- public/modeles/rotor_04/accueil.1679272023.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)