Design of a high-speed centrifugal submersible liquid nitrogen pump with hydrodynamic bearing
This study addressed the need for miniaturization and submersion capabilities in cryopumps by proposing a new structure for a high-speed centrifugal submersible liquid nitrogen pump based on hydrodynamic bearings.It established a design methodology for high-speed centrifugal submersible liquid nitrogen pumps,focusing on critical aspects such as the hydraulic component design of low-specific speed centrifugal pumps,the development of liquid nitrogen hydrodynamic bearings,and the balancing of axial forces in two-stage booster pumps.A numerical analysis of the flow domains in the impeller passage of a sub-mersible liquid nitrogen pump was conducted using CFD simulation software.The results indicate that addition of an inducer can enhance the pump's cavitation performance,and the hydraulic performance of the pump meets the design expectations.The accu-racy and reliability of the pump design are validated through a comparative analysis of numerical simulations and experimental re-sults,providing a reference for the application of small-scale cryogenic fluid pumping.
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