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Part-Load Cavitation Instability Investigation of a High Specific Speed Pump

[+] Author Affiliations
Zhenhua Shen

Jiangsu University, Zhenjiang, ChinaGrundfos China Holding Co., Ltd., Suzhou, China

Nicholas Pedersen, Christian Brix Jacobsen

Grundfos Holding A/S, Bjerringbro, Denmark

Hong Li

Jiangsu University, Zhenjiang, China

Xiaofen Ma

Grundfos China Holding Co., Ltd., Suzhou, China

Paper No. FEDSM2017-69159, pp. V01AT05A011; 6 pages
doi:10.1115/FEDSM2017-69159
From:
  • ASME 2017 Fluids Engineering Division Summer Meeting
  • Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery
  • Waikoloa, Hawaii, USA, July 30–August 3, 2017
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5804-2
  • Copyright © 2017 by ASME

abstract

Cavitation instability in pump part-load condition is an ongoing subject of research due to erosion and noise. For some high specific speed (nq) pumps, NPSH3%-peak at part-load represents one of the cavitation instabilities. This paper describes the recent investigations and results on performance and cavitation instabilities of a high nq pump. An nq 99 impeller that shows a NPSH3%-peak at 70% of nominal flow rate is investigated by using numerical calculations and experiments. Both experimental and numerical results show that the head curves also have instability phenomenon near 70–80% of nominal flow rate. By analyzing simulation results, part-load recirculation near the shroud is found both under non-cavitating and cavitating conditions. With the pressure decreasing, the recirculation zone become larger and cavitation bubbles influence the flow pattern near the trailing edge at the suction side.

Copyright © 2017 by ASME
Topics: Stress , Cavitation , Pumps

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