Study on the Gas–Liquid Two-Flow Characteristics Inside a Three-Stage Centrifugal Pump

Xiang Zhang () and Weidong Cao
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Xiang Zhang: Fluid Machinery Engineering Technology Research Center, Jiangsu University, Zhenjiang 212013, China
Weidong Cao: Fluid Machinery Engineering Technology Research Center, Jiangsu University, Zhenjiang 212013, China

Energies, 2025, vol. 18, issue 17, 1-32

Abstract: This paper takes a small three-stage centrifugal pump as the research object. Based on the RNG k-ε turbulence model and the TFM two-phase flow model, the numerical simulation of the internal gas–liquid two-phase flow was carried out, and the influence of the inlet gas content rate of the small multistage centrifugal pump on its internal flow was analyzed. The research results show that the head and efficiency of the multistage centrifugal pump will decrease with the increase in the inlet gas content rate. As the gas content increases from 0% to 5%, the head of the multistage centrifugal pump decreases by 3% and its efficiency drops by 5%. The trend of the continuous increase in the pressure on the blade surface does not change with the increase in the inlet gas content rate. The bubble area on the surface of the first-stage impeller blade increases with the increase in the gas content rate. When the inlet gas content rate condition reaches 5%, the bubbles cover the middle section of the blade suction surface. The flow vortex structure is mainly composed of blade separation vortices and mouth ring clearance leakage vortices. The vortices inside the impeller are concentrated in the blade outlet and rim area, while the vortices inside the guide vanes are located in the flow channel area of the anti-guide vanes. With the increase in the gas content rate, the amplitude of pressure pulsation in the flow channel inside the pump decreases.

Keywords: multistage centrifugal pump; gas–liquid two-phase flow; numerical simulation; characteristic variation; vortex structure; pressure fluctuation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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