FIELD: engines and pumps.
SUBSTANCE: proposed engine comprises, at least, one combustion chamber with jet nozzle furnished with regenerative cooling system, gas generator, turbo pump unit including turbine has generator, oxidiser pump and fuel pumps. Note here that turbo pump unit comprises two fuel pumps and two extra fuel pumps designed to run on first and second fuels without changing the oxidiser. Note also that first fuel pump, first fuel extra pump, second fuel pump and second fuel extra pump are communicated via start-shutoff valve and flow rate regulators with gas generator and combustion chamber. All valves and flow rate regulators are electrically connected with control unit. Drain pipeline with drain valve is connected between second fuel extra pump and second fuel start-and-shutoff valve. Temperature pickup is arranged ahead of drain valve and electrically connected with control unit. Proposed method comprises feeding second fuel after utilisation of first fuel into gas generator and every combustion chamber with gradual increase in fuel flow rate and decrease in feed of first fuel to its complete outage. Oxidiser represents liquid oxygen while first fuel is hydrocarbon fuel and second fuel is liquid nitrogen. After complete outage of first fuel feed, fuel feed pipelines and regenerative cooling system are blown by inert gas to remove residues of first fuel. Prior to feeding second fuel into gas generator and combustion chamber, second fuel pump and second fuel extra pump are cooled down by forcing second fuel through drain valve unless liquid phase appears in drain pipeline which is controlled by temperature pickup arranged ahead of drain valve. After engine shutdown, regenerative cooling system is blown by inert gas to remove second fuel residues.
EFFECT: higher reliability and power output.
9 cl, 3 dwg
