Study of flow instability in off design operation of a multistage centrifugal pump

Akiha Shibata, Hideto Hiramatsu, Shutaro Komaki, Kazuyoshi Miyagawa*, Manabu Maeda, Shun Kamei, Ryota Hazama, Takeshi Sano, Masamichi Iino

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)493-498
    Number of pages6
    JournalJournal of Mechanical Science and Technology
    Issue number2
    Publication statusPublished - 2016 Feb 1


    • Centrifugal pump
    • Flow instability
    • Off design operation
    • Rotating stall

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Mechanics of Materials


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