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Characteristic Study of Pressure Fluctuation in Centrifugal Pump

[+] Author Affiliations
Yuliang Zhang

Zhejiang University, Hangzhou, Zhejiang,F China

Zuchao Zhu

Zhejiang University, Hangzhou, Zhejiang, China

Baoling Cui, Yi Li

Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China

Paper No. AJK2011-06028, pp. 153-161; 9 pages
doi:10.1115/AJK2011-06028
From:
  • 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
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4440-3
  • Copyright © 2011 by ASME

abstract

In order to reveal the characteristics of pressure fluctuation in centrifugal pump, based on finite volume method, RNG k–ε turbulence model and sliding mesh, the three-dimensional unsteady incompressible viscous flow in a low-specific-speed centrifugal pump is simulated numerically at different flow rates, wherein SIMPLE arithmetic is used to couple pressure and velocity. The calculation region consists of straight suction chamber, impeller and spiral casing. The results show that pressure wave presents periodic sine or cosine regularity in spiral casing, while the characteristic doesn’t appear in suction chamber. In suction chamber, the dominant frequency of pressure fluctuation is equal to rotational frequency of impeller. And in spiral casing, the dominant frequency of pressure fluctuation is equal to the product of rotational frequency of impeller and blade numbers. The dominant frequency of pressure fluctuation for each detection point is constant at any operation conditions. With the augment of operation flow rate, local average pressure in suction chamber will gradually increase, while local average pressure in spiral casing will gradually decrease. The pressure fluctuation at tongue will be more violent as flow rate increases. The pressure fluctuation in spiral volute will gradually decline along rotational direction of impeller.

Copyright © 2011 by ASME

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