Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1976-07-19
1977-08-30
Croyle, Carlton R.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
60 3924, F02C 310
Patent
active
040445526
ABSTRACT:
A gas coupled or free turbine type gas turbine engine of the type having two or more independently rotatable turbines has a set of hydraulic (oil cooled) clutches for coupling a gasifier turbine to a power turbine and wherein the turbine engine includes a combustor for supplying motive fluid to both of the turbines and having an operating characteristic that produces an abrupt fall in the motive fluid temperature at the turbine inlets upon synchronous operation of the independently rotatable turbines. The clutch pressure is controlled by means including an electrically energizable valve component associated wih a control circuit including quick dump inhibit switch means coupled to a synchronous detector for disabling the quick dump inhibit switch during normal operation and wherein means are included to produce a signal in accordance with the turbine inlet temperature; a pre-selected turbine inlet temperature control schedule and a rate of change of gasifier turbine speed and further including a comparator responsive to an abrupt change in output temperature reflecting synchronous speed operation of the turbines and operative to condition the synchronous detector to produce a control signal for operating the quick dump inhibit switch thereby to condition the clutch control switch for producing a quick dump of hydraulic pressure in the clutch to avoid gasifier compressor surge.
REFERENCES:
patent: 3237404 (1966-03-01), Flanigan et al.
patent: 3710576 (1973-01-01), Evans et al.
patent: 3899877 (1975-08-01), Flanigan et al.
Croyle Carlton R.
Evans J. C.
Garrett Robert E.
General Motors Corporation
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