【摘要】 为满足氢燃料电池系统对高速稳定空压机的需求，使用软件仿真和实验结合分析的方法，对搭载了动压空气轴承的25 kW氢燃料电池系统用空压机转子系统进行稳定性分析。首先使用Creo建模软件建立了空压机转子系统动力学模型；再使用Ansys-Workbench有限元软件进行仿真计算，探究了空气轴承支撑刚度以及轴承跨距对临界转速的影响；然后使用流固耦合法计算了径向轴承气膜表面压力与温度分布、平箔片变形程度和轴承承载力；最后在空压机性能测试实验台架上，测试了空压机额定转速下转子的振幅、轴心轨迹和转子振动情况，并进行了15万次启停实验与交变载荷实验和2 000 h高负载耐久实验。结果表明：在额定转速100 000 r/min时，转子系统轴心振幅为13.1μm,整机振动加速度最大为17.64 m/s~2,未出现异常振动现象；启停实验过程中温度维持在30～34℃,交变负载实验过程中温度维持在66～68℃,高负载实验过程中温度维持在94～96℃,3项耐久试验结束后轴承、叶轮未出现明显磨损，表现出良好的动态稳定性。更多还原

【Abstract】 In order to meet the demand of hydrogen fuel cell system for high-speed and stable air compressors,the stability analysis of the air compressor rotor system for 25 kW hydrogen fuel cells system equipped with dynamic pressure air bearings was carried out using a combination of software simulation and experimental analysis.Firstly,the dynamic model of the air compressor rotor system was established using Creo modeling software.Then,Ansys-Workbench software was used for simulation calculations to explore the influence of air bearing support stiffness and bearing span on critical speed.Then,the fluid-solid coupling method was used to calculate the pressure and temperature distribution of the radial bearing air film surface,the deformation degree of the flat foil,and the bearing capacity.Finally,on the air compressor performance test bench,the amplitude,axis trajectory,and rotor vibration of the rotor at the rated speed of the air compressor were tested,and 150 000 start-stop tests,alternating load tests,and 2 000 h high-load endurance tests were carried out.The results show that at the rated speed of 100 000 r/min,the axial amplitude of the rotor system is 13.1 μm,the maximum vibration acceleration of the whole machine is 17.64 m/s~2,and no abnormal vibration occurs;the temperature is maintained at 30～34 ℃ during the start-stop test,the temperature is maintained at 66～68℃ during the alternating load test,and the temperature is maintained at 94～96 ℃ during the high load test.After the three endurance tests,there is no obvious wear on the bearings and impellers,showing good dynamic stability.更多还原