Patent GB-1222272-A (GB)
Title: Improvements in two-phase gas turbine engines having a power phase and a scavenging phase
IPC: F02C5/12
Filed: 1968-02-23
Abstract: 1,222,272. Gas turbine plant. REGIE NATIONALE DES USINES RENAULT and AUTOMOBILES PEUGEOT. Feb.23, 1968 [March 8, 1967], No.8998/68. Heading FIG. The invention relates to a gas turbine engine which comprises an air compressor, combustion chamber, a turbine which drives the compressor and a separate power turbine, the combustion chamber operating intermittently, the arrangement being such that combustion gas flows to the compressor drive turbine and then to the power turbine, the supply of combustion gas then being stopped and a flow of cooling and scavenging air then passed to the compressor drive turbine, the air then being discharged to atmosphere without passing to the power turbine. The engine shown in Fig. 1 comprises a compressor 2, combustion chamber 8 and turbine 3 which drives the compressor through shaft 1, the combustion chamber operating intermittently and receiving fuel from pump 22 through injector 9. The engine comprises also a second similar compressor, combustion chamber and turbine assembly 2<SP>1</SP>, 8<SP>1</SP>, 3<SP>1</SP>. The outlets from the combustion chambers are controlled by a rotary valve member 16 which comprises a disc formed with semi-circular slots 17, 18, the valve member also controlling the flow of scavenging and cooling air through ducts 15 and 15<SP>1</SP> to the compressor drive turbine 3 and 3<SP>1</SP>, the arrangement being such that as combustion gases discharge from combustion chamber 8 to compressor drive turbine 3, scavenging and cooling air passes simultaneously through duct 15<SP>1</SP> to compressor drive turbine 3<SP>1</SP>, and vice versa. The gases discharging from the turbines 3 and 3<SP>1</SP> pass through ducts 37, 37<SP>1</SP> to a separate power turbine 4 which drives a useful load such as the drive-shaft of a vehicle. Ducts 35, 35<SP>1</SP> communicate with the ducts 37, 37<SP>1</SP>, the outlets of the ducts 35, 35<SP>1</SP> to atmosphere being controlled by a rotary valve member 36, the arrangement being such that as combustion gases discharge from turbine 3 through duct 37 to the power turbine 4, the duct 35 is closed and duct 35<SP>1</SP> is opened so that cooling air passing through the turbine 3<SP>1</SP> discharges through duct 35<SP>1</SP> to atmosphere, and vice versa. Thus only combustion gases pass to the power turbine, the cooling air from the turbines 3 and 3<SP>1</SP> passing to atmosphere. In Fig.3 air from the compressor 2 passes alternately to combustion chambers 8 and 8<SP>1</SP> the gases from chamber 8 and the cooling air inflowing through duct 15 passing to the turbine 3 which drives the compressor 2; the gases from the combustion chamber 8<SP>1</SP> and the cooling air inflowing through duct 15<SP>1</SP> passing to the turbine 3<SP>1</SP> which also drives the compressor 2. The gases discharging from the turbines 3 and 3<SP>1</SP> pass in sequence to the power turbine 4, but the cooling air discharging from the turbines 3 and 3<SP>1</SP> passes in sequence to atmosphere through ducts 35 and 35<SP>1</SP>. The flow of air from the compressor 2 to the combustion chambers 8 and 8<SP>1</SP>, also the flow of cooling air through the ducts 15 and 15<SP>1</SP> is controlled by a rotary valve member 16 driven from the compressor drive-shaft 1. The flow of combustion gases to the power turbine 4 and flow of cooling air to atmosphere through ducts 35, 35<SP>1</SP> is controlled by rotary valve member 36 also driven from the shaft 1.