Kinetic energy converter comprising: - at least one injector of a jet formed by a heat transfer fluid and a gas at high temperature connected to a heat transfer fluid source and to a high-temperature gas source, - an impulse wheel fitted rotationally in fixed manner to a shaft extending in a direction substantially perpendicular to the injector, said wheel comprising a plurality of asymmetric blades, the injector being arranged to spray the jet onto said blades so as to drive the shaft in rotation and to transform the axial kinetic energy of the jet into rotational kinetic energy of the shaft, - a tank surrounding said impulse wheel, said tank extending substantially in the direction of the impulse wheel, - at least one deflector extending underneath the blades, where - the deflector presents a shape arranged to recover the mixture of heat transfer fluid and high-temperature gas on outlet from the impulse wheel and to redirect said mixture in a substantially tangential direction to the wall of the tank, - the deflector comprises at least one inlet opening of the mixture of heat transfer fluid and high-temperature gas on outlet from the impulse wheel, said opening extending in a plane substantially perpendicular to the direction of the impulse wheel, and an outlet opening of the mixture, said opening extending near to the wall of the tank in a plane substantially perpendicular to the plane of the inlet opening, said inlet opening and said outlet opening being connected to one another by an enclosure presenting a curved shape, - said wall is arranged to impart a cyclonic effect on said mixture so as to separate the heat transfer fluid from the high-temperature gas, the tank comprising means (66, 68) for recovering the heat transfer fluid and the high-temperature gas. - at least one injector of a jet formed by a heat transfer fluid and a gas at high temperature connected to a heat transfer fluid source and to a high-temperature gas source, - an impulse wheel fitted rotationally in fixed manner to a shaft extending in a direction substantially perpendicular to the injector, said wheel comprising a plurality of asymmetric blades, the injector being arranged to spray the jet onto said blades so as to drive the shaft in rotation and to transform the axial kinetic energy of the jet into rotational kinetic energy of the shaft, - a tank surrounding said impulse wheel, said tank extending substantially in the direction of the impulse wheel, - at least one deflector extending underneath the blades, - the deflector presents a shape arranged to recover the mixture of heat transfer fluid and high-temperature gas on outlet from the impulse wheel and to redirect said mixture in a substantially tangential direction to the wall of the tank, - the deflector comprises at least one inlet opening of the mixture of heat transfer fluid and high-temperature gas on outlet from the impulse wheel, said opening extending in a plane substantially perpendicular to the direction of the impulse wheel, and an outlet opening of the mixture, said opening extending near to the wall of the tank in a plane substantially perpendicular to the plane of the inlet opening, said inlet opening and said outlet opening being connected to one another by an enclosure presenting a curved shape, - said wall is arranged to impart a cyclonic effect on said mixture so as to separate the heat transfer fluid from the high-temperature gas, the tank comprising means (66, 68) for recovering the heat transfer fluid and the high-temperature gas.