氢气循环泵人字槽气体润滑轴承设计与分析OA

To improve the utilization efficiency of hydrogen in fuel cell systems,a novel vane-type hydrogen recirculation pump was designed,with a particular focus on the static and dynamic performance of its key component—the herringbone-grooved gas-lubricated bearing.By constructing the gas-lubricated Reynolds equation and applying the finite difference method combined with Newton iteration,the gas film pressure distribution of the herringbone-grooved bearing with a rectangular groove bottom was systematically analyzed.The influence of groove depth ratio,groove length ratio,and spiral angle on load capacity was investigated.Furthermore,a small perturbation method was introduced to examine how key parameters,such as rotational speed and radial clearance,affect the stiffness and damping characteristics of the bearing.The results show that increasing the groove depth and length ratios reduces the load capacity,while an optimal spiral angle in the range of 50°～60° yields the highest load capacity.Dynamic analysis reveals that stiffness coefficients increase with speed,whereas damping coefficients decrease;both stiffness and damping coefficients decrease with increasing radial clearance.To validate the proposed model,a hydrogen recirculation pump test bench was constructed,and it was observed that when the speed exceeds 50 000 r/min,nonlinear vibrations and instability may occur.The findings provide theoretical guidance and engineering reference for the design of high-efficiency and stable hydrogen recirculation pumps.