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.Alexander Slocum Cumming, Julia E.,S. M.Massachusetts Institute of Technology. Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2020-09-03T17:50:23Z 2020-09-03T17:50:23Z 2020 2020 https://hdl.handle.net/1721.1/127166 1191900713 Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020 Cataloged from the official PDF of thesis. Includes bibliographical references (pages 102-104). Unlike traditional impeller trimming, mechanically varying centrifugal pump impellers or volutes can significantly affect pump performance. This thesis explores the potential for performance enhancement by variable impellers as an alternative to, or possibly in conjunction with, popular pump improvement methods like adjustable speed drives (ASD) and permanent impeller trimming. A review of the theory, existing technology, and potential for future advancement creates the foundation for the final assessment and comparison. The methods developed in the thesis are applied to a case study of the United States Navy Arleigh Burke-class guided missile destroyer (DDG-51 class) firemain to propose appropriate impeller trimming to improve system performance, resulting in an annual fuel savings of nearly 10,000 gallons per ship. Although the DDG firemain is used as the primary example throughout the thesis, the review of pump improvement methods could be applied to many Navy, military, or civilian pumping systems. Additionally, the inclusive analysis that the thesis provides may serve as a helpful starting point for future centrifugal pump research and concept development. by Julia E. Cumming. S.M. S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering 109 pages eng Massachusetts Institute of Technology MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. The practicality of adaptable geometry centrifugal pumps in U.S. Navy systems Thesis application/pdf 2020-09-03T17:50:21Z Publication Master MechE unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="dfb0ea4d-3485-4cf4-a178-629f9d65fe2d"> <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>The practicality of adaptable geometry centrifugal pumps in U.S. Navy systems</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2020</PublicationDate> <Authors> <Author> <DisplayName>Cumming, Julia E.,S. M.Massachusetts Institute of Technology.</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>Unlike traditional impeller trimming, mechanically varying centrifugal pump impellers or volutes can significantly affect pump performance. This thesis explores the potential for performance enhancement by variable impellers as an alternative to, or possibly in conjunction with, popular pump improvement methods like adjustable speed drives (ASD) and permanent impeller trimming. A review of the theory, existing technology, and potential for future advancement creates the foundation for the final assessment and comparison. The methods developed in the thesis are applied to a case study of the United States Navy Arleigh Burke-class guided missile destroyer (DDG-51 class) firemain to propose appropriate impeller trimming to improve system performance, resulting in an annual fuel savings of nearly 10,000 gallons per ship. Although the DDG firemain is used as the primary example throughout the thesis, the review of pump improvement methods could be applied to many Navy, military, or civilian pumping systems. Additionally, the inclusive analysis that the thesis provides may serve as a helpful starting point for future centrifugal pump research and concept development.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>