Method and apparatus for conducting water through ships
AssigneeAktien-Gesellschaft "Weser"
InventorLeopold Nitzki
Life of this patent
Estimating the term…
Abstract
Marine water is conducted onto a ship from a bilge vortex area, and is discharged from the ship into a dead water area above the ship's propeller. The water is moved from the vortex area to the dead water area with the aid of suction generated by the propeller. On the ship the water is desirably used for cooling purposes in the propeller's power plant, particularly in a condensor of the power plant.
Claims11
A method of improving the propulsion characteristics of a powered ship having an only partly submerged hull provided with a partially submerged stern of upwardly divergent cross section and an upper part of which projects rearwardly beyond a lower part thereof, and a propeller located rearwardly of said lower part of said stern, comprising the steps of withdrawing water from the bilge vortex area of the ship's hull in the region where the parallel hull sides begin to taper toward the stern of the hull, so as to reduce turbulence in this region;
- conducting the withdrawn water through the hull;
- and discharging the withdrawn water at opposite sides of the lower part of the stern rearwardly and in directions which intersect the axis of rotation of the propeller so that the discharged water enters into a dead water area which is created by rotation of the propeller adjacent to and defined by the stern of the hull and the entrance angle of inflowing water, in order to fill said dead water area with the water withdrawn from the bilge vortex area and improve the propulsion furnished by said propeller and decrease vibrations resulting from its operations.
In a ship, a combination comprising an only partly submerged hull having a mid-portion provided with parallel hull sides and a partially stern portion of upwardly divergent cross-section wherein the hull sides converge from said mid-portion to the stern portion, said stern portion having a lower part and an upper part which projects rearwardly past said lower part;
- a propeller mounted rearwardly of the lower part of said stern portion of said hull and creating a dead water area when in operation, said dead water area being defined by said stern portion and the entrance angle of the inflowing water;
- inlet means in said hull for admitting ambient water into the same from the area of the bile vortexes which develop during movement of the hull in the region where said mid-portion and stern-portion join, so as to reduce said bilge vortexes;
- and outlets at opposite sides of said stern portion for discharging the withdrawn water rearwardly and in directions which intersect the axis of rotation of said propeller, into said dead water area so as to fill the same with said water to improve the propulsion furnished by said propeller and decrease vibrations resulting from its operation.
Dependencies are inferred from the claim text.