不同压缩比下凸轮式氢气循环泵工作过程及温升数值分析OA

The cam-type hydrogen circulating pump offers advantages such as rapid startup,high effi-ciency,a wide range of applicable working conditions,and a compact structure.As key equipment in proton exchange membrane fuel cells,it typically enhances delivery efficiency by increasing the com-pression ratio.Hydrogen in proton exchange membrane fuel cells has stringent temperature require-ments.Excessively high or low temperatures can affect the state of the internal hydrogen medium,and reduce the kinetic performance of the internal chemical reactions.Two-lobe and three-lobe cycloidal cam-type hydrogen circulating pumps were designed with cycloid-arc combined profiles.Based on nu-merical simulation methods,dynamic mesh technology was employed to simulate the internal flow field to obtain the flow field distribution patterns within the working cavity.Subsequently,the internal working process,pressure distribution,force conditions,and temperature distribution at various monitoring points inside the working cavity were analyzed.Analyses were conducted on the two-lobe and three-lobe cycloidal cam pumps under compression ratios of 1.2,1.3,and 1.4.By utilizing the constructed theo-retical model and thermodynamic theory,the variation patterns of internal temperature under different compression ratios were investigated.The results indicate that,under identical working conditions,the radial force of the two-lobe cycloidal cam rotor exceeds that of the three-lobe cycloidal cam rotor.As the rotor rotates,the temperature at the rotor outlet varies periodically with the rotor profile.As the compression ratio increases,the temperature at the rotor outlet also rises.Each suction and discharge process of the rotor causes a fluctuation in outlet temperature,and the system's expansion power,tech-nical power,and shaft power increase correspondingly.