Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump

Document Type : Regular Article

Authors

1 Chengdu Fluid Dynamics Innovation Center, Chengdu, 610071, China

2 Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, China

3 College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

Abstract

In order to study the unsteady flow and vortex characteristics of tongue cavitation, numerical calculation is carried out for the whole flow channel given different conditions. Then, the calculation results are verified experimentally. The results show that after the occurrence of tongue cavitation in the centrifugal pump, it deteriorates with the decrease of NPSHa. However, when NPSHa is reduced to 3.78 m, it does not change significantly anymore with the decrease of NPSHa. The extrusion of fluid by the vapor at the tongue promotes the formation of the separation vortex, and the re-jet flow caused by the separation vortex leads to vapor shedding. The frequency of cavitation shedding is consistent with the frequency of vortex shedding. In the vorticity transport equation, the relative vortex stretching term and the relative vortex dilatation term dominate the vapor shedding by controlling the change in vorticity. The baroclinic torque term mainly affects the change of vorticity at the vapor-liquid interface, but to a much lesser extent than the first two terms.

Keywords

Main Subjects

References

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History

  • Received: 22 July 2023
  • Revised: 02 November 2023
  • Accepted: 12 November 2023
  • Available online: 01 January 2024

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