Abstract
In recent years, attempts have been made to make multistage centrifugal pumps smaller in size and more efficient. However, such designs are known to cause positive-slope phenomena in the Q-H curve, especially under low-flow conditions. These phenomena, which have thus far been studied experimentally and numerically, stem from flow instability in the pump. However, their mechanisms have not yet been clarified because it depends on various parameters. In this study, we focused on diffuser rotating stall, observed in positive Q-H characteristics. This study elucidates the mechanism of positive-slope generation through experimental results and two-dimensional numerical analysis.
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Akiha Shibata received her B.S. and M.S. degrees from Waseda University, Tokyo, Japan in 2013 and 2015. She is currently working for Mitsubishi Heavy Industries, Ltd., Japan. Her research concerns the mechanism of flow instability observed in multistage centrifugal pump.
Kazuyoshi Miyagawa received his B.S. and M.S. degrees from Waseda University in 1983 and 1985, and the Dr.Eng. from Osaka University in 2007. He is currently a professor at Department of Applied Mechanics and Aerospace Engineering, Faculty of Science and Engineering, Waseda University.
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Shibata, A., Hiramatsu, H., Komaki, S. et al. Study of flow instability in off design operation of a multistage centrifugal pump. J Mech Sci Technol 30, 493–498 (2016). https://doi.org/10.1007/s12206-016-0101-1
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DOI: https://doi.org/10.1007/s12206-016-0101-1