Fluid structure coupling analysis of turbine runner based on ANSYS

LI Hailiang, YAN Jinli, WANG Xufeng
(Zhejiang Fuchunjiang Hydropower Equipment Co., Ltd., Hangzhou 310013, China)

Abstract: In order to gain the stress and strain distribution of the francisturbine runner in water, the fluidsolid coupling method was used to calculate characteristic of francisturbine runner by ANSYS software. Through the establishment of full flow channel model, the precise hydraulic pressure distribution of blades was obtained. The results of flow field were applied in the structure field, the stiffness and strength of runner under different conditions were calculated, the runner′s precise structure stress and deformation were obtained. The computational results show that the maximum stress of runner is less than the allowable stress of the material in water, it meets the strength requirement of design. The deformation is also less than the reserved clearance, it ensures that the runner does not scratch the inside surface of the labyrinth at running, which can make it fall off. The stress data of runner has certain practical significance for the accurate assessment of runner service life.
Key words: francis turbine; runner; fluidstructure coupling analysis; finite element; ANSYS