Power plants – Combustion products used as motive fluid
Patent
1994-07-25
1998-03-03
Thorpe, Timothy S.
Power plants
Combustion products used as motive fluid
60 39142, F02C 7268
Patent
active
057222282
ABSTRACT:
A hydraulic start system is provided having separate, sequentially started hydraulic motors for the controller PMG and for the gas turbine engine starter. Fluid pressure is provided by a hydraulic accumulator to both motors through separating valves. The PMG motor is supplied with fluid first and that drives the PMG to power up and initialize the controller before the starter motor is utilized. The engine itself is coupled to both the starter motor and the PMG through overrunning clutches such that starting the PMG does not start the engine. Once the controller is initialized, fluid is provided to the starter motor and the engine is accelerated through the light-off window and up to a self sustaining speed. As the engine accelerates, it couples with and drives the PMG, decoupling the PMG from its hydraulic motor and shutting off the fluid flow to that motor. Since the controller is fully initialized as the engine reaches the light-off window, effective ignition can occur and stable combustion is available thereafter.
REFERENCES:
patent: 3696612 (1972-10-01), Berman
patent: 3786696 (1974-01-01), Aleem
patent: 3965673 (1976-06-01), Friedrich
patent: 4494372 (1985-01-01), Cronin
patent: 4542722 (1985-09-01), Reynolds
patent: 5069032 (1991-12-01), White
Greubel Alan
Lampe Steven W.
Fountain Ryan M.
Sundstrand Corporation
Thorpe Timothy S.
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