CN1004064B

CN1004064B - Hulllines of displacement ships

Info

Publication number: CN1004064B
Application number: CN87103726.2A
Authority: CN
Inventors: 周锦宇
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-05-22
Filing date: 1987-05-22
Publication date: 1989-05-03
Also published as: CN87103726A

Abstract

The invention relates to a hull line of a drainage type ship, wherein a hull cross section adopts a W-shaped section within the range of 2 to 6 stations forward from a 0 station at the tail part of the ship, a propeller is positioned in a concave part of the hull of the W-shaped section of 31/2 to 41/2 stations forward from the 0 station at the tail part of the ship, so that the propulsion efficiency and the navigation speed of the drainage type ship are improved under the condition of unchanged motive power, the propeller is protected by the hull of the W-shaped cross section, a larger rotation force arm is provided, the stability, the wave resistance and the maneuverability of the ship are improved, and the drainage type ship is particularly suitable for inland rivers and coastal large and medium ships.

Description

Hull line for water-displacement ship

The present invention relates to a hull line of a displacement type ship.

The traditional tail propulsion mode and the ship line form adapted to the traditional tail propulsion mode are influenced by the ship during navigation, so that the propulsion efficiency is low, the ship speed cannot be obviously improved, and the ship line form is not obviously improved. In recent years, in the design of inland and foreign river shallow water ships, when the draught is in the range of 0.7-1.2 meters, the tail part is often in a tunnel type linear shape so as to play a larger thrust role of the blades.

The Chinese patent application CN-GK86106368 discloses a technology for placing propeller propellers at two sides of the bottom of a ship with a 0-station forward 3-41/2-station at the tail of the ship.

The invention aims to provide a hull line type of a drainage type ship, which can adapt to a propeller position enabling the efficiency of the propeller to achieve an open water effect, so that the navigation speed of the drainage type ship is greatly improved under the condition that the motive power is not changed, blades are protected by the hull, and the stability, the wave resistance and the maneuverability of the drainage type ship are improved.

The total length of the displacement type ship is 10 stations, the ship body cross section of the displacement type ship is in a W-shaped cross section within the range of 2 to 6 stations ahead of the tail 0 station of the ship body, namely the bottom is approximately arc-shaped, and a concave part which is obviously bent towards the cabin is formed at the joint of the bottom and the bilge part, like the W-shaped cross section. The propeller is positioned in a concave part of a ship body with a W-shaped section from 31/2 station to 41/2 station forward at the tail part of the ship body, the blades do not exceed the bottom of the ship and the gunwale, so that the water flow of the propeller shaft and the blades is similar to an open water flow field, and the blades are not influenced by the ship body but protected by the ship body.

The problem existing in a tail propulsion mode and a traditional ship streamline design is that water flow at the tail part of a ship is separated from a ship body, on one hand, the pressure of fluid at the tail part is reduced, so that a propeller works in a wake field for supplying water to the ship body from two sides, the efficiency of the propeller is lower than that of an open water flow field by 20-25%, and the pressure of the fluid is reduced in the whole area where the water absorption effect of the tail propeller is achieved. In order to eliminate the adverse factors of a tail propulsion mode and the traditional ship body streamline design, the ship streamline and the propeller opening efficiency are considered uniformly, the traditional design method is broken through, and the line type of the ship rear body is designed to be larger than that of the front body. The propeller is arranged in the ship body with the W-shaped concave part, the front and the back of the paddle are approximately open water, the paddle works in an ideal flow field, and the induced fluid of the propeller continuously moves, so that the water flow pressure at the stern is increased, the resistance of the ship body is reduced, the propeller is protected by the ship body with the W-shaped cross section, and the ship can be designed into an ultra-shallow water ship type and is suitable for large and medium ships at inland rivers and coastal areas.

In addition, compared with the existing ship, the invention eliminates the violent vibration generated by the propeller in the wake flow uneven flow field and the influence of the wake flow field on the propulsion efficiency, also eliminates the cavitation phenomenon of the propeller, ensures that the propeller is not easy to generate cavitation erosion, prolongs the service life, simultaneously provides a larger rotary force arm for the propeller, and greatly improves the navigation speed.

The drawing shows a cross-sectional view of one embodiment of the hull line form of the displacement vessel of the invention, wherein WL1 … … is designed for a full waterline, WL2 … … for an empty waterline, and 1, 2, 3 … 10 for the standing position of the hull. The hull cross section line design from the bow 10 station to the stern 0 station is that the line from the bow to the middle part is narrower than that of the tail part, the concave part is positioned at the joint of the bilge part and the bottom part, a Z-shaped transmission device and other traction devices are adopted, the blades work in the W body, the tail part 0 station positioned at the total length of the hull is positioned forward 31/2 station, double paddles are adopted, and the blades do not exceed the gunwale and the bottom line of the hull.

Claims

1. A hull line of a displacement vessel characterized in that, within the range of 2 to 6 stations forward of the stern, the hull cross section adopts a W-shaped cross section, that is, the bottom is approximately arc-shaped, and a concave portion is formed at the junction of the bottom and the bilge, which is obviously curved inward into the cabin, like a W-shaped cross section. The propeller is located in the concave portion of the W-shaped hull 31/2 to 41/2 stations forward of the stern, and the propeller blades do not extend beyond the bottom line or the side of the ship.