Patent ID: 6823254
Filing Date: 2004-11-23
Classification: F04D,F05D

Abstract:
A method of surge detection within a turbomachine compressor, comprising:measuring the compressor discharge pressure (CDP) of the turbomachine compressor over a period of time; determining a time derivative (CDPD) of the measured (CDP); correcting the CDPD for altitude, (CDPDCOR) inputting CDPDCOR2 into a first filter algorithm (FFA); inputting CDPDCOR into a second filter algorithm (SFA); estimating a short-term average of CDPDCOR2 by using the FFA; estimating a short-term average of CDPDCOR by using the SFA; determining a short-term variance of corrected CDPD (CDProc) based upon the short-term average of CDPDCOR and the short-term average of CDPDCOR2; comparing the short-term variance of CDPDCOR rate of change with a pre-determined threshold (CDPproc); signaling an output when CDProc>CDPproc; and signaling an occurrence of a surge within the turbomachine compressor when CDProc remains>CDPproc for pre-determined period of time.