Abstract
In the process of conveying a medium, when the inlet pressure is low, the cavitation phenomenon easily occurs in the pump, especially in the gas–liquid two-phase working condition. The occurrence of the cavitation phenomenon has a great impact on the performance of the multiphase pump. In this paper, the SST (sheard stress transport) k-ω turbulence model and ZGB (Zwart–Gerber–Belamri) cavitation model were used to simulate the helical axial flow multiphase pump (hereinafter referred to as the multiphase pump), and the experimental verification was carried out. The effect of gas volume fraction (GVF) on the energy loss characteristics in each cavitation stage of the multiphase pump is analyzed in detail. The study shows that the critical cavitation coefficient of the multiphase pump gradually decreases with the increase in GVF, which depresses the evolution of cavitation, and the cavitation performance of the multiphase hump is improved. The ratio of total loss and friction loss to total flow loss in the impeller fluid domain gradually increases with the development of cavitation, and the pressurization performance of the multiphase pump gradually decreases with the development of cavitation. The results of the study can provide theoretical guidance for the improvement of the performance of the multiphase pump.
Highlights
Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China; Citation: Shi, J.; Tao, S.; Shi, G.; Song, Abstract: In the process of conveying a medium, when the inlet pressure is low, the cavitation phenomenon occurs in the pump, especially in the gas–liquid two-phase working condition
J.J. et al [27] studied the effect of impeller geometric parameters on the cavitation performance of centrifugal pumps, and the results showed that increasing the inlet placement angle of the blades within a certain range can improve the cavitation performance of the pump
D. [32] et al investigated the mechanism of the effect of cavitation on the turbine hump characteristics of a pump by numerical simulation, and the results show that the occurrence of cavitation leads to the blockage of the flow passage, reduces the conveying capacity of the flow passage, and induces large vortices in the adjacent flow passage
Summary
The multiphase pump blade curvature is larger, the speed is higher, and the flow separation phenomenon is easy to occur within when transporting the multiphase medium, so the SST k-ω model is selected for the turbulence numerical calculation model in this paper. This model can better handle the viscous flow in the near-wall region and the turbulent flow in the far field. Where ω denotes the turbulent kinetic energy dissipation ratio; β denotes the thermal expansion coefficient; ρ denotes the medium density; μ denotes the viscosity; Pk denotes turbulent kinetic energy; σω denotes the turbulent Prandtl number with the specific dissipation rate
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
