The Finite Element Analysis on Damping Vibration Dynamic Characteristics for Shrouded Blades of Steam Turbine

The solid models of single blade,grouped blade and whole circle blade with Z-shaped shroud are established in 3D software Solidworks based on the features of steam turbine blade profile. By using the mechanical exercise simulation( MES) functions of the ALGOR software,the laws of rub-impact vibration reduction characteristic for grouped blade under different shroud interval,different amplitude of exciting force and different frequency of exciting force were calculated,and the results analyzed. The study results showed that the blade vibration is reduced by using shroud rub-impact structural,when the shroud interval between 0. 2 mm to 0. 5 mm, the rub-impact effect is best. The dynamic stress generated by rotation is not sensitive to the external force. The change of peak stress is small with the change of external exciting force at a certain shroud interval. These conclusions have important guiding significance in design of turbine blades.