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Analysis of the Internal Flow Characteristics, Pressure Pulsations, and Radial Force of a Centrifugal Pump Under Variable Working Conditions

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

In this paper, IS 80-65-160 clean water centrifugal pump is taken as the research object. By comparing the characteristics of internal flow, impeller pressure pulsation and radial force of centrifugal pump under various typical conditions of different adjustment modes, the differential performance of the pump in throttling and frequency conversion adjustment as well as the internal mechanism of energy saving in frequency conversion operation of the pump are obtained. It is found that the maximum amplitude of B4 point is 0.231 under 0.4nr–0.4Qr condition, which is 0.369 lower than 0.60 under throttle adjustment nr–0.4Qr condition, indicating obvious optimization. There are similar optimization rules in flow conditions corresponding to different adjustment modes. From the analysis of the radial force of the impeller, it is found that the pulsation amplitude under the design condition is 17.83 N. During throttling adjustment, with the increase of the flow adjustment range, the main pulsation frequency remains unchanged, the pulsation amplitude gradually increases, and the pulsation peak value reaches 26.42 N under the 0.4nr–0.4Qr operating condition. When frequency conversion adjustment is adopted, as the speed gradually decreases, the main frequency and peak value of the pulsation gradually decrease, and the peak value of the pulsation is less than 4.5 N under the working condition of 0.4nr–0.4Qr, reaching the minimum value. Compared with the flow conditions corresponding to throttle adjustment and frequency conversion adjustment, frequency conversion adjustment can effectively reduce the amplitude of radial force pulsation of the impeller, which is beneficial to the stability of the pump.

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Abbreviations

\(n_{r}\) :

Rated speed (2900 rev/min)

\(Q_{r}\) :

Rated flow (50 m3/h)

‖ ‖:

The 2-norm of the tensor

\(\Omega_{ij}\) :

Symmetric strain rate tensor

\(S_{ij}\) :

Antisymmetric vortex tensor

C p :

The pressure pulsation coefficient

p :

Instantaneous pressure

\(\overline{p}\) :

Average pressure

\(\Delta p\) :

Difference between instantaneous pressure and average pressure

\(\rho\) :

Liquid density, the medium in this article is clean water, ρ = 998.2 kg/m3

\(u_{2}\) :

Impeller outlet peripheral speed (m/s)

D :

The diameter of the impeller inlet, D = 75 mm

n :

The running speed of the pump (r/min)

C t :

The dimensionless time coefficient

t b :

The start time of the impeller cycle

t e :

The end time of the impeller cycle

F :

The resultant force of radial force

A 1 :

The flow area at the inlet of the impeller

A 2 :

The flow area at the outlet of the impeller

V T :

The radial velocity of the fluid particle at a certain node of the impeller

V x :

The sub-velocities in the x directions

V y :

The sub-velocities in the y directions

Ω :

The rotational angular velocity

θ :

The initial angle of the body mass point

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Funding

This study was funded by the National Natural Science Foundation of China (Grant Number: 52009114), Open Research Fund of State Key Laboratory of Hydro-power Equipment of China (No. SKLHE-ORF-202103), and General funded project of China Postdoctoral Science Foundation (2021M692660).

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Authors and Affiliations

  1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi, China

    Wei Dong, Yan Dong, Jian Sun, Haichen Zhang & Diyi Chen

Authors
  1. Wei Dong
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  2. Yan Dong
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  3. Jian Sun
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  4. Haichen Zhang
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  5. Diyi Chen
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Corresponding author

Correspondence to Yan Dong.

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Dong, W., Dong, Y., Sun, J. et al. Analysis of the Internal Flow Characteristics, Pressure Pulsations, and Radial Force of a Centrifugal Pump Under Variable Working Conditions. Iran J Sci Technol Trans Mech Eng 47, 397–415 (2023). https://doi.org/10.1007/s40997-022-00533-w

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  • DOI: https://doi.org/10.1007/s40997-022-00533-w

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