Analysis of influencing factors on the wall vibration of the power section of a circulating water tunnel

Abstract

Considering that the wall vibration of the power section of circulating water tunnels is mainly radial vibration, a numerical model of the interaction between the flow field and the wall of the power section of the circulating water tunnel when the vane wheel is rotating was established to study the influencing factors that affect its vibration law. A slip grid was applied to realize the rotating motion of the vane wheel. The detached eddy simulation with the shear-stress transport k-ω model and the finite solid model were used to solve the hydrodynamic force of the vane wheel in the flow field area and the stress in the solid area, respectively. At the same time, in consideration of the deformation of the fluid and solid regions, the fluid and the solid governing equation were solved, and data were transferred through the fluid-solid interface to realize two-way fluid-solid coupling simulation. Results showed that increasing the number of blades can significantly reduce wall vibration, the natural frequency of the wall region has little effect on vibration, and blade frequency plays a decisive role in wall vibration.