Study On Fluid-solid Coupling For Vibration Of Stay Vane In Hydraulic-turbine

In fact, the outlet flow of vane in the hydroelectric set is non-uniform flow for a variety of possible reasons .The flow is unsteady flow relative to vane and blade, and it is the main factor that affect self-excited vibration and dynamic characteristic of guide vane and hydraulic-turbine, which affect directly the power set to run safely and stably. Hence, they that flow field calculation and dynamical computation of fluid-solid coupling dynamic characteristics are carried out to search flow law in the hydraulic turbine, optimize the design of scroll casing, guide vane, blade and draft tube, and they can apply useful to the monitoring and fault diagnosis system of hydroelectric set as well.FEM equation of fluid-solid coupled vibration was constituted by analyzing FEM equation of incompressible viscosity fluid and elastomer. Based on the equation, vibration characteristics of vane in the air and frequency and swing of fluid-solid coupling vibration are calculated by using ANSYS. Finally calculation of fluid-solid coupling vibration of blade was forecasted on the step by comparing the two vibration characteristics, at one time, the main factor that affect the vibration was analyzed. Finally, the analysis examples were presented combined with some real data from hydroelectric set, they showed that numerical simulationof fluid-solid coupling for vibration in this paper is more available and the natural frequency of guide vane in water is lower than that of in air.