Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1974-03-04
1976-02-17
Gordon, Clarence R.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
60 3916R, 60 3928R, F02C 902
Patent
active
039383210
ABSTRACT:
A control system for a gas-coupled gas turbine engine particularly directed to control of the setting angle of the power turbine nozzle of the engine and to correlation of the power turbine nozzle setting with fuel supply and with operating parameters of the engine. The control provides for operation of the engine from closed to full open throttle, with closed throttle calling for idle speed of the engine. The initial stage of opening the throttle develops an increasing nozzle reference temperature signal which is matched with a turbine temperature signal to control a servo which varies the setting, and therefore area, of the turbine nozzle. After the initial stage of throttle opening, the reference temperature signal increases with engine speed, which increases in response to an increasing throttle signal. The actual level of the nozzle reference temperature is also a function of engine inlet temperature up to a given level of this temperature. Throttle position generates a speed reference signal which is matched with actual gas generator speed to control fuel supply to the engine. The speed reference signal is coordinated with the nozzle reference temperature signal so that there is a smooth transition from the increasing nozzle reference temperature over the initial range of throttle movement to the increasing engine speed reference signal over the remainder of the travel of the throttle up to or near 100% rated power output signal.
The control also responds to acceleration of the gas generator to vary the nozzle reference signals turbine inlet temperature with an acceleration reference temperature signal responsive to engine inlet air temperature, which signal is used to limit engine fuel flow during acceleration. Upon occurrence of an engine acceleration above idle, the opening of the turbine nozzle is limited to improve energy division between the gas generator and power turbines. In one embodiment this limitation is maintained during the duration of acceleration; in another the limitation of nozzle opening is progressively relaxed during the acceleration.
The nozzle opening limitation is overridden during starting of the engine and acceleration to idle, specifically by an override responsive to operation of the starter to crank the gas generator.
REFERENCES:
patent: 3508395 (1970-04-01), Sebestyen
patent: 3521446 (1970-07-01), Maljanian
patent: 3523423 (1970-08-01), Young
patent: 3529419 (1970-09-01), Reed
patent: 3686860 (1972-08-01), White
patent: 3780527 (1973-12-01), Lewis
patent: 3844114 (1974-10-01), Nonnenmann
patent: 3858390 (1975-01-01), Jansen
Davis James L.
Huellmantel Louis W.
Lopke Edward L.
Fitzpatrick Paul
General Motors Corporation
Gordon Clarence R.
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