Title:
SHIP TRAILING STREAM RECTIFYING DEVICE
Document Type and Number:
Japanese Patent JPS62292591
Kind Code:
A
Abstract:
PURPOSE:To prevent the resistance of a rectifying fin from increasing so that the propulsion efficiency is lowered, by providing a rotatable horizontal cylindrical nozzle in a propeller aperture section in a stern of a ship. CONSTITUTION:A ring-like nozzle 5 is rotatably provided in a propeller aperture section 2 in a stern to which a propeller 4 is attached. This nozzle 5 is arranged such that is may be disposed within the diametrical area of the propeller 4. Further, this nozzle 5 has a streamline cross-sectioned shape having a blade chord, and the flow inlet port thereof is a ring-like body greater than that of the flow outlet port thereof. That is, the streamline shape may increase the flow rate while it make the fluid resistance less. with this arrangement, the nozzle 5 may rectify a slow velocity stream within the propeller plane, and the revolving stream in the trailing stream of the propeller 4 may be reduced, thereby it is possible to enhance the gain of propeller wakes and to reduce the propeller vibration exciting force.
Inventors:
NAMIMATSU MASAAKI
Application Number:
JP13588286A
Publication Date:
December 19, 1987
Filing Date:
June 13, 1986
Export Citation:
Assignee:
ISHIKAWAJIMA HARIMA HEAVY IND
International Classes:
B63H5/16; (IPC1-7): B63H5/16