Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Intense fluid-dynamic interaction at the impeller outlet strongly affects the unsteady flow and pressure stability within the centrifugal pump. In order to have a better understanding of the pressure fluctuation of centrifugal pumps, a numerical calculation is carried out by using the RNG k-epsilon...

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Bibliographic Details
Published inScience and Technology of Nuclear Installations Vol. 2022; pp. 1 - 12
Main Authors Ma, Xiaojie, Zheng, Lulu, Qu, Jinglei, Wang, Mengmeng
Format Journal Article
LanguageEnglish
Published New York Hindawi 30.08.2022
John Wiley & Sons, Inc
Hindawi Limited
Subjects
Accuracy
Amplitudes
Analysis
Centrifugal pumps
Equipment and supplies
Finite volume method
Flow control
Flow stability
Flow velocity
Fluid flow
Frequency distribution
Frequency domain analysis
Impellers
Investigations
K-epsilon turbulence model
Low flow
Mathematical models
Nuclear reactors
Numerical analysis
Periodic variations
Simulation
Turbulence models
Unsteady flow
Velocity
China
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Summary:Intense fluid-dynamic interaction at the impeller outlet strongly affects the unsteady flow and pressure stability within the centrifugal pump. In order to have a better understanding of the pressure fluctuation of centrifugal pumps, a numerical calculation is carried out by using the RNG k-epsilon turbulence model under various flow rates. The numerical calculation results are compared with the experimental results in order to verify the reliability of the calculation model. The amplitude and frequency distribution of pressure fluctuation at the impeller outlet is obtained and analyzed in the time and frequency domain. The research results show that the blade passing frequency is the dominant frequency of the pressure fluctuation. And the pressure fluctuation is a periodic fluctuation. As the flow rate decreases, the periodicity of the pressure fluctuation decreases. Besides, the amplitude and intensity of pressure fluctuation are closely related to flow rate and spatial location. At the low flow rate, the amplitude of pressure fluctuation in the time domain and frequency domain is enlarged greatly, especially near the tongue region. The pressure difference distribution on both sides of the blade surface is extremely uneven, and the pressure changes significantly.
ISSN:1687-6075
1687-6083
DOI:10.1155/2022/1758382