Transient cavitation characteristics of compound centrifugal impeller

Feng Jiang, Huacong Li, Xianwei Liu, Jiangfeng Fu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

In order to reveal the transient characteristics of the compound impeller under cavitation condition, the research method using numerical simulation was adopted. The steady and unsteady numerical calculations of cavitation flow in compound impeller were carried out. Monitoring points are set in the circumferential area of the volute aiming to compare the characteristics of pressure fluctuations in the pump during the state of the non-cavitation and cavitation. The results show that in the circumference of the volute, when cavitation isn't started, the dominant frequency is between the long blade passing frequency and the blade passing frequency and is closer to the long blade passing frequency; in the state of cavitation, the pressure fluctuation amplitude in the volute decreases and the dominant frequency is most influenced by the long blade passing frequency. Analyzing the transient flow field inside the impeller under cavitation and non-cavitation states, it is found that when cavitation is started, axial vortices are generated inside the impeller flow path, and the cavitation area is large, vapor blocks the flow path, causing the head of the pump declines.

Original languageEnglish
Title of host publication2021 12th International Conference on Mechanical and Aerospace Engineering, ICMAE 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages245-250
Number of pages6
ISBN (Electronic)9781665433211
DOIs
StatePublished - 16 Jul 2021
Event12th International Conference on Mechanical and Aerospace Engineering, ICMAE 2021 - Virtual, Athens, Greece
Duration: 16 Jul 202119 Jul 2021

Publication series

Name2021 12th International Conference on Mechanical and Aerospace Engineering, ICMAE 2021

Conference

Conference12th International Conference on Mechanical and Aerospace Engineering, ICMAE 2021
Country/TerritoryGreece
CityVirtual, Athens
Period16/07/2119/07/21

Keywords

  • Cavitation flow
  • Compound impeller
  • Pressure fluctuation
  • Transient characteristics

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