DEVICE ENHANCING PROPULSIVE PARAMETERS OF WATER-JET ENGINES Russian patent published in 2005 - IPC

FIELD: shipbuilding; water-jet engines for ships, submersible vehicles and other water craft.

SUBSTANCE: proposed device includes profiled water conduit, shroud, pump and outlet nozzle. At least one ring of wing profile is placed in water conduit formed between shroud in aft extremity of ship and ship's hull coaxially relative to central axis of ship. Convex surface of ring is directed to ship's bow. Lower surface of ring is provided with artificial roughness and plate-type interceptor arranged along smaller radius of ring. When use is made of several rings, ring of larger diameter extends forward to ship's bow and ring of lesser diameter extends the least. Projection of lifting force arising on ring mounted at definite angle of attack relative to flow is directed in way of motion forming additional thrust. Inlet part of water conduit has form of contraction tube. Skin on water conduit in area of mounting of ring (rings) is profiled according to surface of flow of liquid. Proposed device makes it possible to obtain additional thrust no less than 15-20% of propulsor thrust.

EFFECT: enhanced efficiency.

1 dwg