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Les deux révisions précédentes Révision précédente Prochaine révision | Révision précédente | ||
public:modeles:rotor_24a:accueil [2023/03/19 22:36] – ikrambeghdadi | public:modeles:rotor_24a:accueil [2024/08/06 17:02] (Version actuelle) – [Natural frequencies] rafaelbarraud | ||
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Rotor 24A is part of a research program to study the effects of aspect ratio, diffusion factor, and solidity on rotors. To do so, experimental studies have been conducted on a series of high-hub-tip-radius-ratio compressor stages representative of the middle and latter stages of axial-flow compressors. In fact, 14 middle stages were tested to assess the effects on performance of varying both diffusion through the rotor and stator blades and blade aspect ratio. Among these 14 stages, there are rotors 23B, 24A, 25A, 26B, 27A and 28B. Both the tip diameter and the hub-tip radius ratio were held constant throughout each stage at 50.8 centimeters and 0.8, respectively. | Rotor 24A is part of a research program to study the effects of aspect ratio, diffusion factor, and solidity on rotors. To do so, experimental studies have been conducted on a series of high-hub-tip-radius-ratio compressor stages representative of the middle and latter stages of axial-flow compressors. In fact, 14 middle stages were tested to assess the effects on performance of varying both diffusion through the rotor and stator blades and blade aspect ratio. Among these 14 stages, there are rotors 23B, 24A, 25A, 26B, 27A and 28B. Both the tip diameter and the hub-tip radius ratio were held constant throughout each stage at 50.8 centimeters and 0.8, respectively. | ||
- | * Original technical report [(cite: | + | * Original technical report [(cite: |
author | author | ||
date = {1979}, | date = {1979}, | ||
Ligne 22: | Ligne 22: | ||
url = {https:// | url = {https:// | ||
} | } | ||
- | | ||
</ | </ | ||
- | * Picture : | + | * Picture :{{ : |
- | {{ : | + | < |
- | < | + | |
- | + | ||
< | < | ||
author | author | ||
title = {Rotor 24A. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | title = {Rotor 24A. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
- | note = {\href{https:// | + | url |
</ | </ | ||
- | |||
Ligne 39: | Ligne 35: | ||
* [[https:// | * [[https:// | ||
* {{ : | * {{ : | ||
- | * {{ : | + | * {{ : |
</ | </ | ||
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^ aspect ratio | [-] | 0.67 | | ^ aspect ratio | [-] | 0.67 | | ||
^ number of blades | ^ number of blades | ||
- | ^ rotative | + | ^ nominal rotation |
==== Material properties | ==== Material properties | ||
- | The original material of the rotor 24A is not defined in the NASA report. | + | The original material of the rotor 24A is not defined in the NASA report. |
- | Considered properties: 200-grade maraging steel : | ||
^ | ^ | ||
^ alloy | [-] | 18-Ni-200-maraging | ^ alloy | [-] | 18-Ni-200-maraging | ||
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^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 8724.6 | 1388.56 | + | | 1 | 1B | 8724.60 | 1388.56 |
- | | 2 | 1T | 16180.2 | 2575.16 | + | | 2 | 1T | 16180.20 | 2575.16 |
| 3 | 2B | 26469.56 | | 3 | 2B | 26469.56 | ||
+ | ====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: | ||
+ | {{ : | ||
+ | < | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
===== Initial blade ===== | ===== Initial blade ===== | ||
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^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 8759.39 | + | | 1 | 1B | 8759.39 |
| 2 | 1T | 16270.18 | | 2 | 1T | 16270.18 | ||
| 3 | 2B | 26532.13 | | 3 | 2B | 26532.13 | ||
Ligne 130: | Ligne 132: | ||
^ Mode ^ Type ^ Natural angular frequency (rad/ | ^ Mode ^ Type ^ Natural angular frequency (rad/ | ||
- | | 1 | 1B | 8761.4 | 1394.42 | + | | 1 | 1B | 8761.40 | 1394.42 |
| 2 | 1T | 16283.94 | | 2 | 1T | 16283.94 | ||
| 3 | 2B | 26572.34 | | 3 | 2B | 26572.34 | ||
+ | |||
+ | ====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 rotor 24A fait partie d'un programme de recherche visant à étudier les effets de l’allongement, | + | Le rotor 24A fait partie d'un programme de recherche visant à étudier les effets de l’allongement, |
- | * Rapport technique original [(cite: | + | * Rapport technique original [(cite: |
author | author | ||
date = {1979}, | date = {1979}, | ||
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* Photographie : | * Photographie : | ||
{{ : | {{ : | ||
- | < | + | < |
- | < | + | |
author | author | ||
title = {Rotor 24A. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | title = {Rotor 24A. {R}ecords of the {N}ational {A}eronautics and {S}pace {A}dministration, | ||
- | note = {\href{https:// | + | url |
</ | </ | ||
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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 original du rotor 24A n'est pas défini dans le rapport de la NASA. | + | Le matériau original du rotor 24A 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 : | + | |
^ | ^ | ||
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^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 8724,6 | 1388, | + | | 1 | 1F | 8724,60 |
- | | 2 | 1T | 16180,2 | 2575, | + | | 2 | 1T | 16180,20 | 2575, |
| 3 | 2F | 26469, | | 3 | 2F | 26469, | ||
+ | ====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 247: | Ligne 270: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 8759, | + | | 1 | 1F | 8759, |
| 2 | 1T | 16270, | | 2 | 1T | 16270, | ||
| 3 | 2F | 26532, | | 3 | 2F | 26532, | ||
Ligne 255: | Ligne 278: | ||
^ Mode ^ Type ^ Pulsation propre (rad/ | ^ Mode ^ Type ^ Pulsation propre (rad/ | ||
- | | 1 | 1F | 8761,4 | 1394, | + | | 1 | 1F | 8761,40 | 1394, |
| 2 | 1T | 16283, | | 2 | 1T | 16283, | ||
| 3 | 2F | 26572, | | 3 | 2F | 26572, | ||
+ | ====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 = 960,28 rad/s), |
+ | aube initiale (orange), aube de référence (grise)</ | ||
+ | |||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | </ | ||
+ | </ | ||
- public/modeles/rotor_24a/accueil.1679279783.txt.gz
- Dernière modification : 2023/04/05 08:59
- (modification externe)