A gas journal microbearing and the corresponding rotor-bearing system are studied both theoretically and experimentally for their application in the high-speed air compressor of fuel cell vehicles. The gas microbearing is proved to provide reliable support for the rotor, as it shows both static and dynamic pressure effects under the high operating speed of the on-board air compressor. In order to realize the corresponding theoretical analysis, a new UDF dynamic mesh program is internally developed, with which an original method of CFD transient simulation calculations is proposed. Using this method, the gas microbearing’s load-carrying capacity, stiffness and damping coefficients, and static equilibrium position are analyzed for various fluid fields and under different rotational speeds. Theoretical analysis and experimental tests are performed for the corresponding rotor-bearing system in a high-speed air compressor. The experimental result verifies the practicability of the bearings and agrees well with the simulation results, demonstrating the effectiveness and the high accuracy of the new simulation method using dynamic mesh.

对气体轴颈微轴承及其转子轴承系统在燃料电池汽车高速空压机中的应用进行了理论和实验研究。事实证明，气体微轴承为转子提供了可靠的支撑，因为它在车载空气压缩机的高运行速度下同时表现出静态和动态压力效应。为了实现相应的理论分析，内部开发了新的UDF动态网格程序，提出了CFD瞬态仿真计算的独创方法。采用该方法分析了气体微轴承在不同流体场和不同转速下的承载能力、刚度和阻尼系数以及静平衡位置。对高速空压机中相应的转子轴承系统进行了理论分析和实验测试。实验结果验证了轴承的实用性，与仿真结果吻合良好，证明了动态网格仿真新方法的有效性和高精度。