Abstract: A system (10) for reducing the drag of a vehicle (20), said system (10) includes: a pressurised-gas generator (11) configured to generate a gas stream in a gas distribution circuit (12), a blowing nozzle (13) connected to the gas distribution circuit (12) and configured to eject a gas stream, a blind cavity (14) adjacent to the blast nozzle (13), the cavity (14) and the nozzle (13) being configured such that the ejection of the gas stream by the blast nozzle (13) produces a vortex flow in the cavity (14), resulting in pressures of substantially different intensities being applied to two opposite walls of the cavity (14).

Abstract: The injection speed of the injection valves in an internal combustion engine is increased by using a single injection valve configured to carry out multiple fuel injections and combustions per rotation cycle. The single-valve propulsion thermal reactor has a casing with upper and lower walls consecutively defining a sleeve for taking in a pressurized air flow, a combustion chamber, and a gas discharge nozzle. The thermal reactor has a single injection valve to inject fresh gas into the combustion chamber, and at least one valve to exhaust burnt gases, which extends about transverse axes. The valves are cylindrical and have multiple surfaces which have a circular cross-section and are separated by facets that define, by a rotation of the valves, the intake and discharge ports for the gases. Preferably, a thermal ignition tank is built into the combustion chamber.

Abstract: The injection speed of the injection valves in an internal combustion engine is increased by using a single injection valve configured to carry out multiple fuel injections and combustions per rotation cycle. The single-valve propulsion thermal reactor has a casing with upper and lower walls consecutively defining a sleeve for taking in a pressurized air flow, a combustion chamber, and a gas discharge nozzle. The thermal reactor has a single injection valve to inject fresh gas into the combustion chamber, and at least one valve to exhaust burnt gases, which extends about transverse axes. The valves are cylindrical and have multiple surfaces which have a circular cross-section and are separated by facets that define, by a rotation of the valves, the intake and discharge ports for the gases. Preferably, a thermal ignition tank is built into the combustion chamber.

Abstract: The invention relates to a jet engine (1), in particular an aircraft jet engine, including at least one combustion chamber (3). The combustion chamber (3) is connected to at least one compressed gas intake (4) and to at least one burnt gas outlet (5). Said burnt gas outlet(s) (5) include an exhaust valve. The exhaust valve includes two rotary parts (7), referred to as rotary exhaust parts, the rotary exhaust parts (7) including curved walls (8) and intermediate walls (9) connecting the curved walls (8), and rotating in a coordinated, continuous fashion such that said valve is in a closed position in order to block the gas during at least one combustion step, and in an open position in order to define a space (10) through which the gas flows out from the combustion chamber (3) during at least one expansion step.

Abstract: The invention relates to a jet engine (1), in particular an aircraft jet engine, including at least one combustion chamber (3). The combustion chamber (3) is connected to at least one compressed gas intake (4) and to at least one burnt gas outlet (5). Said burnt gas outlet(s) (5) include an exhaust valve. The exhaust valve includes two rotary parts (7), referred to as rotary exhaust parts, the rotary exhaust parts (7) including curved walls (8) and intermediate walls (9) connecting the curved walls (8), and rotating in a coordinated, continuous fashion such that said valve is in a closed position in order to block the gas during at least one combustion step, and in an open position in order to define a space (10) through which the gas flows out from the combustion chamber (3) during at least one expansion step.

Abstract: A vertical take-off vehicle includes two thermoreactors/turbine engines having a rectangular air inlet opening into a positive-displacement rotary compressor supplying compressed air to a tank connected to (i) a combustion chamber whose exhaust gases actuate a compressor-driving turbine and discharge onto the fixed rear wing upper surface, and (ii) the combustion chamber of the main engine whose exhaust gases discharge directly onto the wing upper surface, the variable incidence of which, in take-off mode, generates a lift force adding to the forces that develop on the front wings. In take-off mode, the variable-geometry upper surfaces of the front wings have a maximum camber onto which the exhaust gases produced in an internal combustion chamber flow at great speed. In cruise mode, the combustion chamber is off and the upper surface returns to a reduced camber position as the rear wing returns to an incidence optimizing total drag and lift forces.