Analysis on Operation Stability of Air Compressor Rotor for 25 kW Hydrogen Fuel Cell System
LI Min
CUI Yukun
WANG Qingjie
WU Peiming
WEN Chaowei
GAO Guangdong
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/s2,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.
Keywords：hydrogen fuel cellair compressorcritical speedair bearingaxis trajectorystability analysis
Publication Date：2024-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1-8 )