Dynamic characteristics ofimpeller of perturbed six-bent-bladed turbine (6PBT) and six-bent-bladed turbine (6BT) are analyzedcomparatively using bidirectional fluid-structure interaction (FSI) method based on simulation platform ANSYS Workbench. Macroscopic flow field structure and power consumption caused by the coupling action between the blade and fluid are studied

and the total deformation and equivalent stress distribution along the blade are also analyzed. Besides

the natural and prestressed mode of the 6PBT impeller are investigated comparatively. The results show that

compared with 6BT impeller

the tip deformation and stress of 6PBT impeller are increased by 8% and 61%

respectively

while its root stress is reduced by 6.7% with the well stress distribution of the blade along the radial direction

which indicates that the interaction force between 6PBT impeller and fluid is stronger

resulting in the faster energy dissipation

at the meantime

the blade strength is also improved. The vibration mode of 6PBT impeller under prestressed mode is consistent with that of natural mode

and the modal frequency has no significant changes on the prestressed action

which shows that the fluid-structure interaction and prestressed action have little influence on the blade mode. With the increasing speed

6PBT impeller has an advantage with a better energy saving effect.