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Chryssostomos Chryssostomidis. Cope, David M. (David Michael) Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2012-11-19T19:16:03Z 2012-11-19T19:16:03Z 2012 2012 http://hdl.handle.net/1721.1/74892 814471545 Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 53-54). Hydrodynamic flow visualization techniques of scaled hull forms and propellers are typically limited to isolating certain operating conditions in a tow tank, circulation tunnel, or large maneuvering basin. Although cost effective, these tests provide a limited perspective on the interactions of the entire system. Full-scale testing, other the other hand, provides real world data but is costly. In between, a Froude scaled, free-running model of an existing hull form controls costs but also provides superior hydrodynamic data that can be translated more accurately to full scale. This thesis details the design and construction of a 1/ 3 0 th scale free running model of the David Taylor Model Basin 5415 hull, the precursor to the ubiquitous Arleigh Burke Guided Missile Destroyer hull. The model serves as an experimental platform for advanced maneuvering and propeller crashback studies. The propeller crashback (a core propulsion plant test for both the U.S. Navy and commercial vessels) imparts significant unsteady loads to the engineering plant and drive train. Each of these is respectively of interest to propeller designers and the Electric Ship Research and Development Consortium (ESRDC). The 1 / 3 0 th scale model provides unsteady, time-resolved, accurate 3D flow visualization and propeller loading data as well as measurements of the effects on the electrical propulsion motors. Testing conducted with the model provides the real world effects of the propeller flow interaction with the hull and appendages. The second area of research concerns the high inefficiencies of slender hull forms while maneuvering. During a turn, a significant amount of power is lost to the low pressure region developed on the inside of the turn from shedding vortices that originate along the keel. This increases the tactical diameter of the turn and reduces the turning efficiency of the vessel. Research is currently being conducted around controlling the shedding of vortices and keeping them attached to the hull thereby increasing the turning efficiency and decreasing the turning radius of the vessel. The final area of interest is in forward mounted podded propulsors for use on large vessels. by David M. Cope. Nav.E. S.M. 76 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Design of a free-running, 1/30th Froude scaled model destroyer for in-situ hydrodynamic flow visualization Design of a free-running, one-thirtieth Froude scaled model destroyer for in-situ hydrodynamic flow visualization Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="b48a086f-9e4b-4305-bfcb-2d545ad853dc"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Design of a free-running, 1/30th Froude scaled model destroyer for in-situ hydrodynamic flow visualization</Title> <Subtitle>Design of a free-running, one-thirtieth Froude scaled model destroyer for in-situ hydrodynamic flow visualization</Subtitle> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2012</PublicationDate> <Authors> <Author> <DisplayName>Cope, David M. (David Michael)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>Hydrodynamic flow visualization techniques of scaled hull forms and propellers are typically limited to isolating certain operating conditions in a tow tank, circulation tunnel, or large maneuvering basin. Although cost effective, these tests provide a limited perspective on the interactions of the entire system. Full-scale testing, other the other hand, provides real world data but is costly. In between, a Froude scaled, free-running model of an existing hull form controls costs but also provides superior hydrodynamic data that can be translated more accurately to full scale. This thesis details the design and construction of a 1/ 3 0 th scale free running model of the David Taylor Model Basin 5415 hull, the precursor to the ubiquitous Arleigh Burke Guided Missile Destroyer hull. The model serves as an experimental platform for advanced maneuvering and propeller crashback studies. The propeller crashback (a core propulsion plant test for both the U.S. Navy and commercial vessels) imparts significant unsteady loads to the engineering plant and drive train. Each of these is respectively of interest to propeller designers and the Electric Ship Research and Development Consortium (ESRDC). The 1 / 3 0 th scale model provides unsteady, time-resolved, accurate 3D flow visualization and propeller loading data as well as measurements of the effects on the electrical propulsion motors. Testing conducted with the model provides the real world effects of the propeller flow interaction with the hull and appendages. The second area of research concerns the high inefficiencies of slender hull forms while maneuvering. During a turn, a significant amount of power is lost to the low pressure region developed on the inside of the turn from shedding vortices that originate along the keel. This increases the tactical diameter of the turn and reduces the turning efficiency of the vessel. Research is currently being conducted around controlling the shedding of vortices and keeping them attached to the hull thereby increasing the turning efficiency and decreasing the turning radius of the vessel. The final area of interest is in forward mounted podded propulsors for use on large vessels.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>