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Accession Number ADA567631
Title Propeller Design Optimization for Tunnel Bow Thrusters in the Bollard Pull Condition.
Publication Date Jun 2012
Media Count 98p
Personal Author I. J. Wilkins
Abstract Tunnel bow thrusters are often used by large ships to provide low- speed lateral maneuverability when docking. Required to provide high thrust while essentially at a standstill, the design point for these thrusters is the bollard pull condition. Traditionally, the term bollard pull refers to the amount of force a tug can apply to a bollard when secured to a pier. Here, the bollard pull condition is used to describe a propeller with no flow over it except for that induced by its own rotation. Conventional propeller design is primarily performed for an optimal vessel speed or range of speeds. OpenProp, a propeller design code based on lifting line theory, is a numerical model capable of design and analysis of such propellers. It has been experimentally validated for standard design conditions in an external flow, but until now has been incapable of design with no external fluid velocity component applied. Recent updates to the model now allow for bollard pull design work. This project is the first application of the OpenProp model update. Propellers are designed for both open water and ducted (tunnel) applications in OpenProp.
Keywords Bollard pull
Low velocity
Open water

Source Agency Non Paid ADAS
NTIS Subject Category 81D - Jet & Gas Turbine Engines
47A - Marine Engineering
Corporate Author Massachusetts Inst. of Tech., Cambridge.
Document Type Thesis
Title Note Master's thesis.
NTIS Issue Number 1309
Contract Number N00244-09-G-0014

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