System and method for detecting rotating stall in a...

F - Mech Eng,Light,Heat,Weapons – 04 – D

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F04D 27/02 (2006.01)

Patent

CA 2493197

A system and method is provided for detecting and controlling rotating stall in the diffuser region of a centrifugal compressor. A pressure transducer is placed in the gas flow path downstream of the impeller, preferably in the compressor discharge passage or the diffuser, to measure the sound or acoustic pressure phenomenon. Next, the signal from the pressure transducer is processed either using analog or digital techniques to determine the presence of rotating stall. Rotating stall is detected by comparing the detected energy amount, which detected energy amount is based on the measured acoustic pressure, with a predetermined threshold amount corresponding to the presence of rotating stall. Finally, an appropriate corrective action is taken to change the operation of the centrifugal compressor in response to the detection of rotating stall.

L'invention porte sur un système et un procédé de détection et contrôle du décollement dans la zone du diffuseur (119) d'un compresseur centrifuge (108). A cet effet on place un transducteur de pression (160) dans le flux de gaz en aval de l'impulseur (202), de préférence dans le passage de décharge du diffuseur (119) pour mesurer le son ou un phénomène de pression acoustique. On traite ensuite le signal du transducteur au moyen de techniques analogiques ou numériques pour déterminer la présence du décollement, la détection se faisant en comparant la quantité d'énergie détectée fonction de la pression acoustique mesurée, à un seuil prédéterminé correspondant à la présence du décollement. Finalement, en réponse à la détection du décollement, on prend une mesure corrective appropriée agissant sur le fonctionnement du compresseur (108).

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