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English to French translations [PRO]
Tech/Engineering - Mathematics & Statistics / compresseur | | English term or phrase: compressor's proximity to surge | Context: General Surge Control Algorithm
"Antisurge control is implemented by monitoring the compressor’s proximity to surge Ss, which is defined as:" |
| | | approche du compresseur de la phase de pompage | Explanation:
maximum et à proximité du pompage) révèle que, du blocage vers le pompage, ... favorables à retarder l'entrée en pompage du compresseur qui est localement ...
lmfa.ec-lyon.fr/turbo/Doc/resume_these_N.Bulot.pdf |
| Selected response from:
 GILLES MEUNIER
France
Local time: 05:27
| Grading comment merci Gilles
4 KudoZ points were awarded for this answer |
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| Discussion entries: 0 |
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Automatic update in 00:
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2 hrs confidence:   le moment où le compresseur approche de la phase de pompage
Explanation:
"Le pompage est un phénomène aérodynamique qui intervient dans un compresseur. Il s'agit d'une instabilité aérodynamique qui donne naissance à des ondes longitudinales. Une inversion du sens d'écoulement peut se produire. Lorsque la différence de pression entre l’entrée et la sortie du compresseur devient trop élevée, des instabilités que l'on appelle décollements apparaissent au niveau des aubes du compresseur. Si en augmentant la vitesse de rotation la différence de pression entre l'entrée et la sortie d'un compresseur augmente, cette augmentation de pression est limitée par ce phénomène de pompage.
Lorsque le rapport de compression (c’est-à-dire le rapport entre la pression de sortie et la pression d'entrée du compresseur) dépasse une valeur critique, le pompage apparaît et l'augmentation de la vitesse de rotation des aubes du compresseur n'influera presque plus sur le rapport de compression. Si ce phénomène nivelle les performances des compresseurs, c'est également un phénomène destructeur pour les aubes des compresseurs."
http://fr.wikipedia.org/wiki/Pompage
"Axi-symmetric stall or compressor surge
Axi-symmetric stall, more commonly known as compressor surge; or pressure surge, is a complete breakdown in compression resulting in a reversal of flow and the violent expulsion of previously compressed air out through the engine intake, due to the compressor's inability to continue working against the already-compressed air behind it. The compressor either experiences conditions which exceed the limit of its pressure rise capabilities or is highly loaded such that it does not have the capacity to absorb a momentary disturbance, creating a rotational stall which can propagate in less than a second to include the entire compressor.
The compressor will recover to normal flow once the engine pressure ratio reduces to a level at which the compressor is capable of sustaining stable airflow. If, however, the conditions that induced the stall remain, the return of stable airflow will reproduce the conditions at the time of surge and the process will repeat.[1] Such a "locked-in" or self-reproducing stall is particularly dangerous, with very high levels of vibration causing accelerated engine wear and possible damage, even the total destruction of the engine.."
http://en.wikipedia.org/wiki/Compressor_stall
"pelons que pour éviter que le compresseur n'entre dans une phase de pompage, il faut que le débit soit suffisant. Si le débit effectif ..."
http://www.mesures.com/archives/046_049_DOS.pdf
| FX Fraipont
Belgium
Local time: 05:27
Native speaker of:  French
PRO pts in category: 40
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