Propeller with small duct, and ship

A propeller and duct technology, applied in the directions of rotating propellers, ship propulsion, ship parts, etc., can solve the problems of cavitation, large interference between large ducts and propellers, etc., and achieve the effect of low cost, small and lightweight friction resistance, and improved efficiency

Active Publication Date: 2014-04-09
PORT & AIRPORT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The interference between large ducts and propellers is large, so the efficiency is improved in actual sea areas where the load is increased, but cavitation that occurs between the propellers and ducts becomes a problem, and it is hardly used in large ships

Method used

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  • Propeller with small duct, and ship
  • Propeller with small duct, and ship
  • Propeller with small duct, and ship

Examples

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Embodiment 2

[0108] The thrust of embodiment 2 is increased compared with embodiment 1, and the thrust of embodiment 3 is increased compared with embodiment 2.

[0109] Such as Figure 8 As shown, the smaller the distance L between the front edge of the propeller 10 and the rear end 22 of the duct 20, the more the thrust increases.

[0110] According to the propeller with a small duct according to the present embodiment, in the propeller with a small duct having the propeller 10 attached to the stern of the hull 1 and the duct 20 attached to the front of the propeller 10, the duct 20 and the propeller 10 of decreasing pitch In combination, the duct 20 can be downsized, the diameter Ddin of the duct 20 is 20% to 50% of the diameter Dp of the propeller 10, and the duct 20 can be brought close to the propeller 10 without causing cavitation. Therefore, by setting the pitch H of the propeller 10 to a decreasing pitch that decreases in the radial direction with a maximum value at the root of th...

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Abstract

This propeller with a small duct is characterized by comprising the following: a propeller (10) which is attached to the stern of a ship hull (1); and a duct (20) attached in front of said propeller (10). Said propeller with a small duct is further characterized in that: the diameter (Ddin) of the duct (20) is 20% to 50% of the diameter (Dp) of the propeller (10); and the pitch (H) of the propeller (10) decreases progressively in the radial (R) direction, with the maximum pitch at the bases of the blades and the minimum pitch at the tips of the blades. By using an energy-efficient device that combines characteristics of large ducts and mid-sized ducts, adjusting the shape of the propeller (10), and disposing the small duct (20) near the front of said propeller (10), cavitation is reduced in ocean areas in which the degree of loading is increased, and interference from the small duct (20) is utilized to optimize the load distribution in the radial (R) direction of the propeller (10), which controls efficiency.

Description

technical field [0001] The present invention relates to a propeller with a small duct having a propeller attached to the stern of a hull and a duct attached to the front of the propeller, and a ship provided with the propeller with a small duct. Background technique [0002] Among the existing ducts installed near the propeller, there are large ducts that cover the propeller and have a larger diameter than the propeller, and medium-sized ducts that are slightly smaller in diameter than the propeller and are arranged in front of the propeller. [0003] A large duct that covers the propeller type is used as an effective thruster when the load degree integrated with the propeller is high, which is called a ducted propeller. The reason for this is that the propeller and the duct have a large interference, and it is reasonable to use a performance that takes this interference into account as a propeller. [0004] On the other hand, the medium-sized duct in front of the propeller...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63H5/16B63H1/26
CPCB63H5/04B63H1/26B63H5/16
Inventor 佐佐木纪幸川岛英干藤泽纯一
Owner PORT & AIRPORT RES INST
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