Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (8): 8-12.doi: 10.3969/j.issn.1000-565X.2016.08.002

• Power & Electrical Engineering • Previous Articles     Next Articles

Investigation into Vibration Characteristics of Last Stage Blades in a Steam Turbine

ZHAO Wen-sheng WANG Peng-fei LI Yan-hui LIU Mei-qing JIANG Jin   

  1. School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,Hubei,China
  • Received:2015-09-16 Revised:2016-03-08 Online:2016-08-25 Published:2016-07-04
  • Contact: 赵文胜( 1983-) ，男，副教授，主要从事能源动力系统流固耦合振动研究． E-mail:wenson.zhao@gmail.com
  • About author:赵文胜( 1983-) ，男，副教授，主要从事能源动力系统流固耦合振动研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China( 51409197) and the Natural Science Foundation of Hubei Provincial( 2015CFB253)

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Abstract: A three-dimensional finite element model of last stage blades is constructed,and the static frequency and mode shape of the blades are analyzed.Then,the dynamic frequencies of the blades under pre-stressed conditions are calculated,and the effect of the operating speed on the vibration characteristic of the blade is investigated.Finally,the static frequency test,the dynamic frequency test and the vibration response test are conducted on a vibration test table.The results show that ( 1) the test results accord well with the model-simulated values; ( 2) the dynamic frequencies increase with the rotational speed,and they are greater than the static frequencies; ( 3) the rotational speed greatly affects the low-order frequencies; and ( 4) under the nine double frequency excitation of the rotational speed,a second-order resonance occurs,and the blades are more likely to suffer a fatigue failure.

Key words: steam turbine, last stage blade, vibration characteristic, vibration test