GAS TURBINE ENGINE WITH FREE-PISTON GAS GENERATOR Russian patent published in 2014 - IPC F02C5/08 

FIELD: engines and pumps.

SUBSTANCE: gas turbine engine with a free-piston gas generator (FPGG) consists of FPGG, a gas intake and a gas turbine, which are connected to each other. FPGG includes a working cylinder of the engine, working pistons of the engine, compressor pistons, a synchronising movement mechanism of working pistons of the engine and compressor pistons, blowdown slots, exhaust slots, an injector, suction and delivery valves, compressor cylinders, buffer cavities and a compressor receiver. An air blower is connected to a turbine of a blower drive by means of a shaft. A transfer gearbox is connected by means of a shaft to a power turbine. The gas turbine engine includes a startup unit of air starting, start valves, a fuel pump, plunges, a heat exchanger, a bypass manifold with a safety and control valve and start springs. Plungers are arranged on end surfaces of compressor pistons on the side of buffer cavities. The heat exchanger is made so that engine combustion products can pass through it before they are vented to atmosphere and fuel can enter it through a distributing heat exchange surface. The bypass manifold with the safety and control valve is made so that combustion products can be supplied through it immediately to the heat exchanger at the engine working cylinder start. Start springs are arranged on end covers of the buffer cavities and made so that they can put the engine into operation at absence of compressed air by means of pressure force of compressed start springs, which are brought to the working compressed state by additional movement by means of a synchronising movement mechanism of working engine pistons and compressor pistons together with plungers to upper dead points.

EFFECT: stable engine efficiency values at varying ambient air temperatures and fuel temperature; improving economy of used heat of the fuel burnt in the engine and providing reliable engine start at insufficient pressure of compressed air or its absence in a starting mechanism.

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