Power plants – Combustion products used as motive fluid – Combined with regulation of power output feature
Patent
1979-06-20
1981-01-20
Garrett, Robert E.
Power plants
Combustion products used as motive fluid
Combined with regulation of power output feature
415 38, 415 44, F02C 902
Patent
active
042454646
ABSTRACT:
A gas turbine engine has a compressor and power turbine driven by gas flow across a nozzle arrangement that includes a partial admission gate valve therein movable into and out of overlying relationship with a limited number of vanes of the nozzle in order to control power output therefrom during part load operation of the engine. The gates are operated by quick response pneumatic operators having a regulated source of pressure applied to the operators to close the gates during a low power, road load mode of engine operation; an orifice restricts flow into a pressurizable chamber formed in part by a movable power diaphragm to cause a controlled buildup of pressure therein and a slow velocity extension of the operator to position the gates in part power position and wherein means are included to produce a slow rate retraction to avoid excess turbine temperatures and wherein dump means disconnect the regulated pressure from the operator whereby the diaphragm is snapped by a return spring to produce a quick spring biased opening of the gate valve from its partial blocking position to a full open position during a time period that prevents turbine compressor surge as the gas turbine engine responds to a higher power demand wherein greater gas flows through the nozzle for increasing power output from the power turbine of the engine.
REFERENCES:
patent: 2565178 (1951-08-01), Imbert
patent: 3025668 (1962-03-01), Mock
patent: 3383090 (1968-05-01), McLean
patent: 3388778 (1968-06-01), McLean
patent: 3814537 (1974-06-01), Stoltman
patent: 3913316 (1975-10-01), Canale et al.
Evans J. C.
Garrett Robert E.
General Motors Corporation
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