MARINE VESSEL PROPULSION SYSTEM WITH A NOZZLE AND A PROPELLER

摘要

The invention relates to a marine vessel propulsion system with a nozzle body and a propeller surrounded by the latter; the nozzle body has an inner surface which forms a flow duct, and also an outer surface; there is a constriction between the inlet plane and the outlet plane of the flow duct; as seen in axial section, the inner delimiting surface of the flow duct has a first contour between the inlet plane and the constriction and a second contour between the constriction and the outlet plane; the constriction is located at a distance of 0.25 to 0.55 of the length of the nozzle body, measured from the inlet plane, preferably of 0.3 to 0.4.