GAS TURBINE ENGINE SYNCHRONOUS SPEED DETECTOR

摘要

GAS TURBINE ENGINE SYNCHRONOUS SPEED DETECTOR 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 energizabie valve component associated with 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.