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Title:
SHIP WITH SMALL DUCT AND METHOD FOR ASSESSING APPLICATION OF SMALL DUCT ON SHIP
Document Type and Number:
WIPO Patent Application WO/2014/115567
Kind Code:
A1
Abstract:
This ship with a small duct is characterized in having a propeller (10) attached to a stern of a hull (1), and a duct (20) attached to the front of the propeller (10), the hull (1) being a small duct having a propeller load condition in actual sea areas of 1.0 or greater and an eddy resistance of 10% or greater, and the diameter of the duct (20) being between 20% and 50% inclusive of the diameter of the propeller (10). Therefore, a hull (1) that yields a horsepower-reducing effect is specified from the relationship between eddy resistance and the propeller load condition, and the shape of the propeller (10) is contrived and a small duct (20) is placed near the front of the propeller (10) as an energy-saving device that has the characteristics of both a large duct and a small duct, whereby cavitation is suppressed and interference with the small duct (20) is utilized to optimize the radial load distribution of the efficiency-governing propeller (10) in actual sea areas where the load rate increases.

Inventors:
SASAKI NORIYUKI (JP)
KAWASHIMA HIDEKI (JP)
FUJISAWA JUNICHI (JP)
KUME KENICHI (JP)
ICHINOSE YASUO (JP)
Application Number:
JP2014/000404
Publication Date:
July 31, 2014
Filing Date:
January 27, 2014
Export Citation:
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Assignee:
NAT MARITIME RES INST (JP)
International Classes:
B63H5/16; B63B1/32; B63H5/07
Domestic Patent References:
WO2013014938A12013-01-31
Foreign References:
JPH082486A1996-01-09
JPH09175488A1997-07-08
JP2007230541A2007-09-13
JP2000016373A2000-01-18
JP2010095181A2010-04-30
JPS5690797A1981-07-23
JP2006306304A2006-11-09
JP2008260445A2008-10-30
JP2007331549A2007-12-27
US4309172A1982-01-05
JPH082486A1996-01-09
JPH09175488A1997-07-08
JPS5632396A1981-04-01
JP2007331549A2007-12-27
JPH0264890A1990-03-05
JP2010095181A2010-04-30
Other References:
See also references of EP 2949570A4
Attorney, Agent or Firm:
ABE, Shinichi et al. (JP)
Shin-ichi Abe (JP)
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