Keenan etal gas turbine power plant

Claim 1

GAS TUBINE POWER PLANT HAVING A FLOW DUCT WHICH IS PROVIDED IN FLOW SERIES WITH AN AIR INTAKE PASSAGE, COMPRESSOR MEANS, PRIMARY COMBUSTION EQUIPMENT, TURBINE MEANS, REHEAT COMBUSTION EQUIPMENT AND AN EXHAUST PASSAGE; A SUPPLEMENTARY AIR DUCT HAVING AN UPSTREAM PORTION WHICH COMMUNICATES WITH THE AIR INTAKE PASSAGE SO AS TO BE ADAPTED TO RECEIVE RAM AIR THEREFROM AND A DOWNSTREAM PORTION WHICH COMMUNICATES WITH SAID EXHAUST PASSAGE DOWNSTREAM OF THE REHEAT COMBUSTION EQUIPMENT; A RAM AIR DUCT; VALVE MEANS IN SAID SUPPLEMENTARY AIR DUCT, AND MEANS FOR SETTING THE SAID VALVE MEANS SELECTIVELY IN A FIRST POSITION IN WHICH RAM AIR FLOWING THROUGH THE UPSTREAM PORTION OF THE SUPPLEMENTARY AIR DUCT IS DIRECTED INTO THE RAM AIR DUCT AND FLOW OF RAM AIR THROUGH THE DOWNSTREAM PORTION OF THE SUPPLEMENTARY AIR DUCT IS PREVENTED AND A SECOND POSITION IN WHICH RAM AIR FLOWING THROUGH THE UPSTREAM PORTION OF THE SUPPLEMENTARY AIR DUCT FLOWS INTO THE DOWNSTREAM PORTION THEREOF, AND FLOW OF RAM AIR INTO THE RAM AIR DUCT IS PREVENTED, THE RAM AIR DUCT COMMUNICATING WITH THE SAID FLOW DUCT UPSTREAM OF THE REHEAT COMBUSTION EQUIPMENT, WHEREBY WHEN THE SAID VALVE MEANS IS SET IN THE SAID FIRST POSITION AND THE SAID PRIMARY COMBUSTION EQUIPMENT IS SHUT DOWN, THE POWER PLANT MAY BE OPERATED AS A RAM-JET ENGINE, RAM AIR BEING SUPPLIED THROUGH THE RAM AIR DUCT, WHILE WHEN THE SAID VALVE MEANS IS SET IN THE SAID SECOND POSITION, THE POWER PLANT MAY BE OPERATED AS A GAS TURBINE ENGINE IN WHICH RAM AIR PASSES INTO THE EXHAUST PASSAGE FROM THE DOWNSTREAM PORTION OF THE SUPPLEMENTARY AIR DUCT TO CONTROL BE EXPANSION IN THE EXHAUST PASSAGE OF THE EXHAUST GASES.