标题：Mechanical Char acteristics Analyses of the First Stage Impeller in the Low Pressure Cylinder of an H418 Centrifugal Compressor
作者：Zhang, Ming; Zhao, Zi-Zhen; Li, Meng-Li; Wang, Wei-Qiang; Xie, Hai-Bao
作者机构：[Zhang, Ming; Zhao, Zi-Zhen; Li, Meng-Li; Xie, Hai-Bao] Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples 更多
通讯作者地址：[Zhang, M]Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China.
来源：JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS
关键词：Shrouded impeller; local blade thinning; mechanical characteristic;; dangerous location; vibration mode
摘要：The relevant mechanical characteristics of the first stage impeller in the low pressure cylinder of an H418 centrifugal compressor were analyzed by the finite element method. The results showed that the maximum Von Mises stress appears in the middle of the blade root when the impeller underwent only a centrifugal load. The local thinning of the blade's leading edge close to the shroud caused by wear is usually the 'small mistuning', and the natural frequencies and vibration modes of mistuned impellers are similar to that of the ideal impeller. The stress concentration mainly appeared in the middle of the blade's leading edge and the vibration mode of the blade's leading edge was similar to the bending vibration of a cantilever with a sliding mass at the other end when the impeller resonated in the region around the rated speed because of the wake flow. The research provided references for the fatigue testing of impellers in the future.