Many mixed-flow and axial flow pumps exhibit a so-called unstable head curve. Due to the risk of instabilities this flow region is usually avoided during pump operation. This paper presents experimental and numerical research on the relation between the instability in the head curve and the magnitude of unsteady hydraulic forces. It is found that there is a strong influence of the extend of the clearance gap between impeller blades and casing. The spectral content of the forces shows evidence of rotating instabilities. It indicates that not only instability of the head curve and unsteady forces are interrelated, but also rotating instabilities play a role in this phenomenon. Results of CFD calculations are presented as well, showing the difficulties in simulating the flow under such conditions.
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ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
July 24–29, 2011
Hamamatsu, Japan
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4440-3
PROCEEDINGS PAPER
Unstable Operation of a Mixed-Flow Pump and the Influence of Tip Clearance
Bart van Esch,
Bart van Esch
Eindhoven University of Technology, Eindhoven, The Netherlands
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Li Cheng
Li Cheng
Yangzhou University, Yangzhou, Jiangsu, China
Search for other works by this author on:
Bart van Esch
Eindhoven University of Technology, Eindhoven, The Netherlands
Li Cheng
Yangzhou University, Yangzhou, Jiangsu, China
Paper No:
AJK2011-06016, pp. 79-87; 9 pages
Published Online:
May 25, 2012
Citation
van Esch, B, & Cheng, L. "Unstable Operation of a Mixed-Flow Pump and the Influence of Tip Clearance." Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D. Hamamatsu, Japan. July 24–29, 2011. pp. 79-87. ASME. https://doi.org/10.1115/AJK2011-06016
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