STEAM-WATER ROCKET ENGINE Russian patent published in 2022 - IPC F02K9/80 

FIELD: engine building.

SUBSTANCE: invention uses the unique thermophysical properties of water in various physical and phase states to create a jet engine without applying special materials with specific heat and fire resistance and unique manufacturing technologies in the structure of engines. The steam-water jet engine of takeoff boosters for heavy launch vehicles constitutes a water-fillable chamber with an expansion channel along the longitudinal axis of the chamber, with a nozzle head in the head of the engine and a thrust control apparatus integrated in the expansion channel. The apparatuses for heating the water in the chamber to supercritical temperatures can be integrated in the chamber or external. The flow sections of the nozzles provide a non-isentropic mode of steam outflow with ultrafast adiabatic supercooling and condensation/crystallisation in the cavity of the nozzle. EFFECT: creation of the steam-water jet engine eliminates the application of expensive, explosive, or toxic rocket fuels demanding to the conditions of manufacture, transportation, and storage; accordingly, the cost of rocket engines and infrastructure for application thereof, as well as the negative environmental consequences associated with creation and application thereof, are greatly reduced; combustion chambers and turbopump units subjected to extreme heat and mechanical loads on the structure are not used in the design of steam-water rocket engines; accordingly, during creation thereof, the engines do not to undergo hundreds and often thousands of fire tests, as during creation of traditional powerful liquid-jet engines.

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