Open AccessReinforcement and resonance control of head cover of Francis turbine by finite element analysis and modal testing
Author(s) -
Junfeng Xie,
Bo Huang,
Liang Fu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/560/1/012051
Subject(s) - head (geology) , cover (algebra) , francis turbine , natural frequency , turbine , modal , finite element method , vibration , modal analysis , hydropower , reinforcement , hydraulic head , engineering , marine engineering , structural engineering , acoustics , geology , geotechnical engineering , physics , materials science , mechanical engineering , electrical engineering , geomorphology , polymer chemistry
This article discusses the problem of excessive vertical vibration of head cover for Francis turbine installed in Baishi hydropower plant, including its treatment and effectiveness evaluation. In order to build the head cover model accurately, to successfully predict the natural frequencies of the head cover after reinforcement, and to control the resonance risk caused by the close proximity between the natural frequency of the head cover and the water pressure pulsation in the flow passage, the method of combining numerical simulation and experimental measurements is carried out. The results show that the natural frequencies of the reinforced head cover avoid main excitation frequencies of the Francis turbine, and the vertical vibration of the head cover is significantly reduced, with a maximum reduction of 73.6%.