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

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...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2016, 30(2), , pp.493-498
Main Authors: Shibata, Akiha, Hiramatsu, Hideto, Komaki, Shutaro, Miyagawa, Kazuyoshi, Maeda, Manabu, Kamei, Shun, Hazama, Ryota, Sano, Takeshi, Iino, Masamichi
Format: Article
Language:English
Subjects:
Centrifugal pumps
Control
Diffusers
Dynamical Systems
Engineering
Flow stability
Industrial and Production Engineering
Instability
Mathematical models
Mechanical Engineering
Multistage
Numerical analysis
Pumps
Stability
Stalling
Two dimensional
Two dimensional analysis
Vibration
기계공학
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Summary: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.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-016-0101-1