Power plants – Reaction motor – Method of operation
Patent
1992-09-23
1993-05-18
Casaregola, Louis J.
Power plants
Reaction motor
Method of operation
F02K 302
Patent
active
052110079
ABSTRACT:
Control of a gas turbine engine, suitable for powering an aircraft, is accomplished by varying outlet nozzle cross section and/or a mixing of bypass air with exhaust gas at an inlet to the nozzle. The engine includes a core engine having a combustion chamber and high and low pressure turbines followed by an exhaust plenum. High and low pressure compressors driven by the turbine assembly direct air into the combustion chamber and into a bypass duct. The bypass duct extends from an outlet of the low pressure compressor. Pressure of fluid (air or exhaust) is measured at an inlet to the high pressure compressor, in the bypass duct, and in the exhaust plenum. Ratios of the pressure of the duct pressure or of the pressure at the inlet of the high-pressure compressor, to the plenum pressure are employed in a feedback loop for control of nozzle size, and also of mixing valve position in an alternate embodiment of the invention. The feedback loop includes computation of a desired pressure ratio based on desired power and inlet temperature to the low-pressure compressor.
REFERENCES:
patent: 4139887 (1979-02-01), Levesgue
patent: 4159625 (1979-07-01), Kerr
patent: 4414807 (1983-11-01), Kerr
patent: 4467600 (1984-08-01), Peikert
patent: 4959955 (1990-10-01), Patterson et al.
Casaregola Louis J.
General Electric Company
Shay Bernard E.
Squillaro Jerome C.
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