Double-engine and double-propeller stern composite structure

Abstract

The invention relates to a double-engine and double-propeller stern composite structure. A connecting shaft part of each of a pair of propellers of a stern is provided with a tail fin (2). A ship hull is located in the range among the tail fins (2) and a rudder in the longitudinal direction, and small dead wood (1) is arranged in the middle position of the ship hull in the transverse direction. The small dead wood (1) is located at the positions of the propellers or behind the propellers in the longitudinal direction. According to the double-engine and double-propeller stern composite structure, the contribution to the shipping direction stability of a traditional dead wood manner is reserved to the maximum degree through the small dead wood; and compared with the traditional dead wood manner, the part coinciding with the side area of the tail fins is removed, and only the small dead wood near one propeller disc face is reserved. The small dead wood is matched with the tail fins for maintaining stability of shipping of a ship; a large part of wet surface area is reduced through the small dead wood, and therefore friction resistance is lowered, and the total resistance of the ship hull is reduced; the section thickness is evenly reduced from top to bottom, and the double-engine and double-propeller stern composite structure is in a wedge-shaped pattern.

Description

technical field [0001] The invention relates to a composite structure of a ship's stern, in particular to a composite structure in which a tail fin of a ship's stern is matched with a dead wood, and the design of the diversion, rotation performance and stability of the ship's stern belongs to the technical field of ship's stern design. Background technique [0002] As an appendage structure to improve the ship's course stability, dumb wood is widely used in ships in the form of two engines and two propellers. [0003] The dead wood is generally set at the central axis of the bottom and stern of the ship to separate a pair of propellers. The traditional dead wood is longer and extends from the vicinity of the stern propeller disk to the main engine of the hull. [0004] Due to the large size of this form of dead wood, the wet surface area of ​​the ship is larger, which in turn causes greater frictional resistance of the ship's navigation; at the same time, the huge dead wood ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the existing double-engine double-screw stern structure, the large size of the dead wood results in a large wet surface area of ​​the ship, which in turn causes relatively large frictional resistance when the ship sails; at the same time, the huge dead wood Reduced turning performance at full rudder; in addition, when the tail line adopts a larger tail fin, it has an adverse effect on the propeller inflow at the paddle surface

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