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International Journal of Turbo & Jet-Engines

Ed. by Sherbaum, Valery / Erenburg, Vladimir


IMPACT FACTOR 2018: 0.863

CiteScore 2018: 0.66

SCImago Journal Rank (SJR) 2018: 0.211
Source Normalized Impact per Paper (SNIP) 2018: 0.625

Online
ISSN
2191-0332
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Volume 32, Issue 1

Issues

Study on Internal Flow and External Performance of a Semi-open Impeller Centrifugal Pump with Different Tip Clearances

Xiao-Qi Jia / Bao-Ling Cui
  • Corresponding author
  • The Zhejiang Provincial Key Laboratory of Fluid Transmission Technology, Zhejiang Sci-Tech University, Hangzhou, China
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yu-Liang Zhang / Zu-Chao Zhu
  • The Zhejiang Provincial Key Laboratory of Fluid Transmission Technology, Zhejiang Sci-Tech University, Hangzhou, China
  • State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China
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  • De Gruyter OnlineGoogle Scholar
Published Online: 2014-05-13 | DOI: https://doi.org/10.1515/tjj-2014-0010

Abstract

To study the influence of tip clearance on internal flow characteristics and external performance of a prototype centrifugal pump with a semi-open impeller, the unsteady numerical simulation and performance experiments are carried out in this paper. The evolution process of leakage vortex with time t, the flow characteristics and the magnitude of leakage rate in tip clearance are obtained in details. The results indicate that the H-Q curve hump of centrifugal pump shows a weakened trend with the increasing of tip clearance Δc. Meanwhile, the leakage rate ΔQ and the ratio of leakage rate to discharge flow rate (ψ) gradually increase. At the same tip clearance, the leakage rate ΔQ increases, while the ratio of leakage rate to discharge flow rate (ψ) decreases with the increasing of discharge flow rate Q. It is found that higher volumetric loss account for a higher percentage of the total loss at small flow rate condition. There easily exist strong leakage vortexes in the impeller inlet, impeller passage and impeller outlet. The pressure difference between suction side and pressure side makes the fluid pass through the tip clearance layer to form a lower pressure region and leakage vortex.

Keywords: centrifugal pump; semi-open impeller; tip clearance; leakage vortex; leakage rate

PACS®(2010): 47.32.-y

About the article

Received: 2014-04-01

Accepted: 2014-04-08

Published Online: 2014-05-13

Published in Print: 2015-04-01


Citation Information: International Journal of Turbo & Jet-Engines, Volume 32, Issue 1, Pages 1–12, ISSN (Online) 2191-0332, ISSN (Print) 0334-0082, DOI: https://doi.org/10.1515/tjj-2014-0010.

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Journal of Thermal Science, 2018, Volume 27, Number 1, Page 8
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