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CSME 2018/12
Volume 39 No.6
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575-583
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Mechanical Char acteristics Analyses of the First Stage Impeller in the Low Pressure Cylinder of an H418 Centrifugal Compressor
Ming Zhanga, Zi-Zhen Zhaoa, Meng-Li Lia, Wei-Qiang Wangb and Hai-Bao Xiea
aSchool of Mechanical & Automotive Engineering, Qilu University of Technology(Shandong Academy of Sciences), Jinan, Shandong 250353, China
bSchool of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
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Abstract:
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.
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Keywords: Shrouded impeller, local blade thinning, mechanical characteristic, dangerous location, vibration mode.
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©
2018
CSME , ISSN 0257-9731
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