Investigation on the lubrication regimes and dynamic characteristics of hydro-hybrid bearing of two-circuit main loop liquid sodium pump system

This manuscript aims to investigate the lubrication performances of the hydro-hybrid bearing which is lubricated by liquid sodium in the fast reactor two-circuit main loop liquid sodium pump system. The liquid sodium lubrication bearing is modeled and analyzed using the advanced rotating mechanical dynamics analysis software. For different initial conditions, lubrication characteristic parameters and dynamic coefficients are studied systematically. Through the analysis, lubrication mechanisms under different operation conditions are revealed, which are completely different from the traditional oil or water lubricated bearing. The investigation lays solid foundation for further study on dynamic analysis of the liquid sodium bearing-nuclear main pump rotor coupled system. Research results have certain directive significance for the special engineering requirement hydro-hybrid bearing.