Study of flow instability in off design operation of a multistage centrifugal pump |
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Authors: | Akiha Shibata Hideto Hiramatsu Shutaro Komaki Kazuyoshi Miyagawa Manabu Maeda Shun Kamei Ryota Hazama Takeshi Sano Masamichi Iino |
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Affiliation: | 1.Mitsubishi Heavy Industries, Ltd.,Tokyo,Japan;2.Faculty of Science and Engineering,Waseda University,Okubo,Japan |
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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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