Based On Fluid-solid Coupling Vibration Characteristics Analysis Of Bulb Tubular Turbine Runner

The low-head hydro resource is very abundant in China. In order to meet the needs of rapid economic development of regions, people began to develop low-head hydro resources. And bulb tubular hydropower station is the best choice to develop low-head hydropower resources. With the construction of large hydroelectric power station, hydropower station design plays important role in stability of tubular turbine. Runner is the core component of turbine, and the vibration and damage of runner could directly affect the safe operation of bulb tubular hydropower station. It is quite critical to research on stability of tubular turbine runner.In this paper, the research object is bulb-type turbine runner. ADINA software is used to do the dynamic analysis of tubular turbine runners which is based on fluid-solid interaction. The main research contents are as follows:When frequency of interference is close to natural frequency of turbine blade, it will cause resonance easily. In this case, it will do harm to the blade’s running. With the help of UG CAD software, it models for tubular turbine runner. Appling finite element software ADINA to carried out turbine vibration modal analysis on the water and in the air in the bulb tubular respectively, and calculate the natural frequency and natural mode of vibration of the runner. Moreover, comparing analysis of two kinds of medium frequency results with and without pre.When the water flow through guide vanes, it will produce eddy problems such as Karman Vortex Street, its alternating stress will make the turbine blade produce a large deformation.With the help of finite element software ADINA on harmonic analysis of runner blade of tubular turbine, to find out the frequency response of structures under harmonic loads among a given frequency range, and find the frequency corresponds to the key point in the maximum displacement. Moreover, it is necessary to try the best to avoid it. Bulb-type turbine rotates through the flow of energy pushing the blades to rotate. It must have a very large kinetic energy of the water impact runner to prompte the blades spin up, and drive the rotation of generators to produce electricity. In this paper, ADINA software is used to do transient state dynamics analysis of runner based on fluid-solid interaction. Runner began to rotate under the state of only fluid hydraulic influence. Analysis blade deformation and stress-strain changes load effect with the load effect corresponding to time, find the maximum values, and look for maximum points to measure whether it can meet the requirements or not.