The Numerical Analysis And Structure Optimization Of Radial Gas Bearing With Turbine-based

The performance of core components of turbo-expander-bearing-rotor system affect rotating,safety and reliability of the equipment directly.As small turbo-expander,high rotating speed is needed to improve efficency,and higher requirements are put forward for bearing.And high speed is precisely one of the advantages of gas bearing.In this paper,we do numerical simulation and experimental research on static character of hydro-static radial gas bearing's flow field based on the theory of gas lubrication and finite volume method.The main and specific work are following:(1)In vertical supply method,some structural parameters(such as hole margin and diameter of supply holes) of gas bearing will be numerical simulated in different conditions(like the shaft is static and high-speed rotating) and eccentricity to show its effect on bearing performance(like load capacity,stiffness and gas consumption).And the optimal structure will be selected out.(2)In tangential supply method,different diameter of supply holes will be numerical simulated in different conditions to show its effect on bearing performance.And the optimal structure will be selected out.(3)This part is comparison of two different methods(vertical and tangential supply methods) on bearing performance.(4)Build a laboratory bench to do experimental research on gas bearing.This paper presents numerical simulation and experimental study on bearing performance of hydro-static radial gas bearing,and the results show that the numerical simulation method taken in this paper on hydro-static radial gas bearing based on turbo-expander is creditable.