Gas turbine stall/surge identification and recovery

Details Gas turbine stall/surge identification and recovery Gas turbine stall/surge identification and recovery

1989-09-15

1991-09-24

Lall, Parshotam S.

Boots, shoes, and leggings

36455101, 731172, 731173, 60 39091, 415 17, G05B 1500, F01D 1702

Patent

active

050519182

ABSTRACT:
Parameters indicative of gas turbine engine operational characteristics are sensed and the signals processed to derive further operational characteristic information therefrom, each information signal being compared in a subroutine to a corresponding threshold signal for exceedence thereof, the magnitude of each threshold signal being indicative of incipiency of compressor stall, a counter being incremented in the subroutine upon any threshold exceedence occurrence, the amount of counter increment depending on the ability of each information signal to predict the incipiency of stall, the higher the counter value the greater the stall incipiency. The counter is decremented during each subroutine execution, the counter value during the current subroutine execution being compared to that of the previous subroutine execution to determine the direction of stall incipiency. The counter is utilized as a bias signal to an engine acceleration schedule to vary the rate of acceleration as the counter is varied.

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