Modeling flow characteristics of a low specific-speed centrifugal pump with different volute shapes
Author(s)Wettermark, Susan Daly.
Massachusetts Institute of Technology. Department of Mechanical Engineering.
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A centrifugal pump is typically designed for a specific operating condition. The pump's shape and size are fine-tuned so that it can produce a specified output pressure and flow rate at the maximum possible efficiency. When a pump begins operating off of its design flow rate, its efficiency drops. Pumping systems often involve dynamic demands. They may have a fluctuating flow rate demand throughout the day, or the system may evolve and change size over time. In these cases, pumps with a single operating point are inefficient and insufficient. This thesis assesses the effects of changing a pump's volute casing geometry on the volute's internal flow characteristics. All analysis is performed on a low-specific-speed, radial flow centrifugal pump. 2D flow models from literature and CFD are analyzed and compared to experimental data. With properly-chosen solution methods, a 2D CFD simulation is found to match well with experimental results. Efficiency estimates and life-cycle cost changes due to changing flow characteristics in the variable volute system are presented.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, June, 2019Cataloged from the official PDF of thesis.Includes bibliographical references (page 39).
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology