An Impact Analysis of the Amplitude and Uneven Distribution of the Preload Amplitude on the Top Cover and Bolt of the Hydro Turbine
The working state of the connecting bolts of the hydro turbine unit plays an important role in the stable operation of the hydro turbine unit,this paper selects multiple groups of working conditions within a certain range according to the criteria of preload application,and studies and analyzes the deformation law of the top cover structure of the hydro turbine under different preload forces and the stress characteristics of the connecting bolts.The results show that when 335 kN preload is applied,the maximum deformation of the top cover is 2.53 mm,the maximum stress of the inner top cover connecting bolts is 91 MPa,whereas when the preload of 945 kN is applied,the maximum deformation of the top cover is 2.31 mm,the maximum stress of the inner top cover connecting bolts is 238.5 MPa,and the stress of the bolts is less than its bearing limit;the greater the preload,the smaller the deformation of the top cover,the greater the stress of the bolt,and the maximum stress of the bolts is concentrated and distributed at the joint surface with the top cover flange.
water turbinetop cover boltsbolt stiffnessfinite element
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