PROPELLER WITH SMALL DUCT, AND SHIP - NAT MARITIME RES INST

Title:

PROPELLER WITH SMALL DUCT, AND SHIP

Document Type and Number:

WIPO Patent Application WO/2013/014938

Kind Code:

A1

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.

Inventors:

SASAKI NORIYUKI (JP)
KAWASHIMA HIDEKI (JP)
FUJISAWA JUNICHI (JP)

Application Number:

PCT/JP2012/004777

Publication Date:

January 31, 2013

Filing Date:

July 26, 2012

Export Citation:

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Assignee:

NAT MARITIME RES INST (JP)
SASAKI NORIYUKI (JP)
KAWASHIMA HIDEKI (JP)
FUJISAWA JUNICHI (JP)

International Classes:

B63H5/16; B63H1/26

Foreign References:

JPH082486A	1996-01-09
JPH09175488A	1997-07-08
JPH09175488A	1997-07-08
JPS5632396A	1981-04-01
JPH0317996U	1991-02-21
JP2008143488A	2008-06-26
JP2007331549A	2007-12-27
JP2002220089A	2002-08-06
JPH10264890A	1998-10-06

Other References: