Patent ID: 6857845
Filing Date: 2005-02-22
Classification: F04D,F05D,Y10S

Abstract:
1. A method for correcting rotating stall in a radial diffuser of a centrifugal compressor, the method comprising the steps of: measuring a value representative of acoustical energy associated with rotating stall in a radial diffuser of a centrifugal compressor; filtering the measured value with a bandpass filter to obtain a filtered value; rectifying the filtered value with a full wave rectifier to obtain a rectified value; filtering the rectified value with a low pass filter to obtain a stall energy component; comparing the stall energy component with a predetermined value to determine rotating stall in the radial diffuser, wherein rotating stall is present in the radial diffuser when the stall energy component is greater than the predetermined value; and sending a control signal to the centrifugal compressor to adjust an operational configuration of the centrifugal compressor in response to a determination of rotating stall.