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Vessel

A ship and hull technology, applied in the direction of ship propulsion, hull, ship parts, etc., to achieve the effect of improving propulsion efficiency and propeller efficiency

Active Publication Date: 2017-12-01
MITSUI ENG & SHIPBUILD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the conduit device of this ship, the two connecting plates connected to both ends of the shell that fixes the shell to the stern are preferably in a shape that hardly resists the flow of water passing through the conduit device, but only as the shell The supporting structure is used

Method used

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Embodiment Construction

[0035] Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings. Such as figure 1 As shown, the ship 1 is configured to have a propeller 3 and a rudder 4 at the rear of the hull 2, and a duct 10 is arranged at the stern immediately in front of the propeller 3 and above the propeller rotation axis Lp.

[0036] Such as figure 1 and figure 2 As shown, this duct 10 is comprised by having the duct member 11 and the supports 12a, 12b which support this duct member 11 to the hull 2. As shown in FIG. The support members 12a, 12b are arranged between the end of the duct member 11 and the hull 2, the starboard side support member 12a is connected to the starboard side end of the duct member 11, and the port side end of the duct member 11 is connected to the Support 12b on the port side. That is, supporters 12 a and 12 b are connected to both ends of the duct member 11 . in addition figure 2 The circle 20 in is the c...

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Abstract

In the present invention, a connecting location 13 between a duct member 11 and each of struts 12a and 12b is disposed in the vicinity of a bilge vortex occurring at the stern in cases when a duct 10 is not provided. The duct member is formed with an opening angle alpha of 0-40DEG where the leading edge-side is further to the outside with respect to the propeller rotary axis Lp than the trailing edge-side. The struts are provided at angles gamma a and gamma b with respect to the hull longitudinal direction X so as to induce the increase in a flow component that is opposite in direction to the propeller rotation direction R. Thus, in a vessel 1 in which the duct is disposed at the stern, propulsion can be achieved by the duct member, and the bilge vortex is rectified by the connecting location between the duct member and each of the struts to weaken the flow in the same direction as the propeller rotation direction, and the direction of water flowing into the propeller surface Sp is turned in the direction opposite the rotation direction of a propeller 3 by the struts to improve the propeller efficiency.

Description

technical field [0001] The present invention relates to a ship provided with a duct at the stern. Background technique [0002] In a displacement type ship such as a general commercial ship, the bilge vortex generated by the hull on the stern side is located above the height of the propeller shaft. The flow in the same direction as the propeller rotation is caused on the outside of the vortex, and the flow in the same direction as the propeller rotation is caused in the inner side of the bilge vortex on the starboard side. In the case of a left-rotating propeller, it is opposite, so there is a relative flow velocity of the water flow into the propeller Slower, less efficient propellers. [0003] As one of countermeasures against this, for example, as described in Japanese Patent Application Laid-Open No. 2008-137462, as a duct device for a ship with a high energy saving effect and easy manufacture, the following duct device for a ship is proposed. The conduit device of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H5/16B63B1/32
CPCB63B1/32B63H5/16Y02T70/10
Inventor 山本虎卓秋林秀聪冈沙织
Owner MITSUI ENG & SHIPBUILD CO LTD