Rotary kinetic fluid motors or pumps – Method of operation
Reexamination Certificate
2005-02-22
2005-02-22
Nguyen, Ninh H. (Department: 3745)
Rotary kinetic fluid motors or pumps
Method of operation
C415S118000, C415S914000
Reexamination Certificate
active
06857845
ABSTRACT:
A system and method is provided for detecting and controlling rotating stall in the diffuser region of a centrifugal compressor. The process begins with the detection or sensing of acoustic energy associated with the onset of rotating stall. 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.
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Beaverson Gregory Keith
Bender James Edwin
Stabley Robert Edward
McNees Wallace & Nurick LLC
Nguyen Ninh H.
Sattizahn Brian T.
York International Corporation
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