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Analysis of unsteady radial forces of multistage centrifugal pump with double volute

Analysis of unsteady radial forces of multistage centrifugal pump with double volute PurposeRadial vibration of horizontal centrifugal pump has a close association with radial exciting forces. The purpose of this paper is to analyze the unsteady radial force in multistage centrifugal pump with double volute in detail and investigate the relevance of static pressure, radial force and radial vibration.Design/methodology/approachThe unsteady numerical simulation with realizable k-ε turbulence model was carried out for a multistage centrifugal pump with double volute using computational fluid dynamics codes Fluent. The performance tests were conducted by use of a closed loop system and performance curves from numerical simulation agree with that of experiment. Vibration tests were carried out by vibration probes instrumented on the bearing cover of pump near no-driven end. Fast Fourier transform was used to obtain the frequency components of radial forces on the impellers from numerical simulation, which are compared with ones of radial vibration from experiment in Y and Z direction. And the static pressure distributions in the impeller were analyzed under different flow rates.FindingsThe symmetrical double volute can effectively balance radial forces. The maximum radial force and vibration velocity appear at 0.6 Q among the three flow rates 0.6 Q, Q and 1.2 Q. The frequencies corresponding to relatively large amplitude of vibration velocities and radial forces on the impellers in Y direction are blade passing frequency of the impellers. Blade passing frequency of first-stage impeller and shaft frequency are predominating in Z direction. It indicates that the radial vibration of centrifugal pump is closely related to the unsteady radial force.Originality/valueThe unsteady radial forces of the impeller in multistage centrifugal pump with double volute were comprehensively analyzed. The radial forces should be considered to balance during the design of multistage centrifugal pump. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Engineering Computations Emerald Publishing

Analysis of unsteady radial forces of multistage centrifugal pump with double volute

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0264-4401
DOI
10.1108/EC-12-2016-0445
Publisher site
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Abstract

PurposeRadial vibration of horizontal centrifugal pump has a close association with radial exciting forces. The purpose of this paper is to analyze the unsteady radial force in multistage centrifugal pump with double volute in detail and investigate the relevance of static pressure, radial force and radial vibration.Design/methodology/approachThe unsteady numerical simulation with realizable k-ε turbulence model was carried out for a multistage centrifugal pump with double volute using computational fluid dynamics codes Fluent. The performance tests were conducted by use of a closed loop system and performance curves from numerical simulation agree with that of experiment. Vibration tests were carried out by vibration probes instrumented on the bearing cover of pump near no-driven end. Fast Fourier transform was used to obtain the frequency components of radial forces on the impellers from numerical simulation, which are compared with ones of radial vibration from experiment in Y and Z direction. And the static pressure distributions in the impeller were analyzed under different flow rates.FindingsThe symmetrical double volute can effectively balance radial forces. The maximum radial force and vibration velocity appear at 0.6 Q among the three flow rates 0.6 Q, Q and 1.2 Q. The frequencies corresponding to relatively large amplitude of vibration velocities and radial forces on the impellers in Y direction are blade passing frequency of the impellers. Blade passing frequency of first-stage impeller and shaft frequency are predominating in Z direction. It indicates that the radial vibration of centrifugal pump is closely related to the unsteady radial force.Originality/valueThe unsteady radial forces of the impeller in multistage centrifugal pump with double volute were comprehensively analyzed. The radial forces should be considered to balance during the design of multistage centrifugal pump.

Journal

Engineering Computations – Emerald Publishing

Published: May 8, 2018

References

  • Estimation of radial load in centrifugal pumps using computational fluid dynamics
  • Evaluation of hydraulic radial forces on the impeller by the volute in a centrifugal rotary blood pump
  • Characteristics of centrifugal pumps working in direct or reverse mode: focus on the unsteady radial thrust
  • Pressure fluctuation in a vaned diffuser downstream from a centrifugal pump impeller
  • Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation
  • An experimental study on the fluid forces induced by rotor-stator interaction in a centrifugal pump
  • Quantitative evaluation of flow-induced structural vibration and noise in turbomachinery by full-scale weakly coupled simulation
  • The effect of twin volutes on the flow and radial hydraulic force production in a submersible centrifugal pump
  • Experimental and numerical investigation of radial forces acting on centrifugal pump impeller
  • Study on the radial diffuser of multistage high pressure pump
  • A review of cavitation in hydraulic machinery
  • Comparison of cavitation prediction for a centrifugal pump with or without volute casing
  • Computational comparison of an air-air ejector system utilizing a primary s-bend transition duct employing the realizable k-ε Turbulence Model
  • Rotordynamic force prediction of centrifugal compressor impellers using computational fluid dynamics
  • Component analysis of unsteady hydrodynamic force of closed-type centrifugal pump with single blades of different blade outlet angles
  • Experimental test on impeller clocking effect in a multistage centrifugal pump
  • Unsteady hydrodynamic forces due to rotor-stator interaction on a diffuser pump with identical number of vanes on the impeller and diffuser