Acceleration control with duct pressure loss compensation

Details Acceleration control with duct pressure loss compensation Acceleration control with duct pressure loss compensation

1989-05-30

1991-06-11

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Multiple fluid-operated motors

60 39251, F02C 928

Patent

active

050222244

ABSTRACT:
Control logic means to compensate for fan bypass duct pressure losses in a system that controls the acceleration mode for a twin spool gas turbine engine so as to allow the engine to accelerate rapidly with adequate stall margin by simulating a compressor stall limit. The stall limit is attained by generating a limiting ratio of burner pressure and another engine pressure as a function of corrected compressor rotor speed assuming that the stall margin is independent of compressor bleed, power extraction and degradation of engine efficiency. Compensation is by generating an engine pressure ratio signal as a function of corrected low pressure compressor rotor speed and using the difference between the signal and actual engine pressure ratio for modifying the simulated compressor stall limit.

REFERENCES:
patent: 3882672 (1975-05-01), Bauerfeind
patent: 4117668 (1978-10-01), Elsaesser et al.
patent: 4228650 (1980-10-01), Camp

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