A propeller (10) setting a small duct (20) of the present invention includes a propeller (10) and a duct (20). A diameter Ddin of the duct is set to 20% or more and 50% or less of a diameter Dp of the propeller (10), and a pitch H of the propeller (10) is a decreasing pitch which reduces in a radial direction of the propeller (10), and which becomes a maximum value at a blade root of the propeller (10) and becomes a minimum value at a blade tip of the propeller (10). The small duct (20) is placed in front of and close to the propeller (10). According to this, in an actual sea, cavitation is suppressed, and a load distribution of the propeller (10) in its radial direction which governs efficiency is optimized by utilizing interference with respect to the small duct (20).
PROPELLER WITH SMALL DUCT, AND SHIP
PROPELLER MIT KLEINEM KANAL UND SCHIFF
HÉLICE ÉQUIPÉE D'UN PETIT CARÉNAGE ET NAVIRE
2019-01-02
Patent
Electronic Resource
English
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |