WATER-JET PROPELLER Russian patent published in 1997 - IPC

FIELD: shipbuilding; high-speed ship propellers. SUBSTANCE: water-jet propeller includes water conduit, axial-flow impeller mounted on shaft inside water conduit near its shear and bracket. Conditions are created for guaranteed formation of air cavities on impeller blades. This is achieved due to the following: trailing edges of peripheral sections of impeller blades coincide with plane of water conduit shear, section of impeller blades has form of wedge and trailing edge of each blade has stepped projection on side of its s driving surface; height of this projection reaches 0.05 of length of chord of impeller blade section. Besides that, thickness of wall in area of exit shear of water conduit in its upper portion exceeds that in lower portion; circular groove is formed in end of wall in its upper portion which is communicated with atmospheric air. EFFECT: enhanced efficiency. 2 cl, 2 dwg