Failure analysis and repair suggestions for cracks in the runner chamber of a power plant unit

As the production and operation cycle of hydropower plant units increases, unit equipment may frequently experience problems such as aging and failure. The vibration problem of the bulb tubular turbine in a certain power plant is serious, especially the cracks in the runner chamber. It is necessary to identify the main reasons for the vibration of the runner chamber to provide a theoretical basis for the safe operation of the power plant. This paper studies and analyzes the vibration characteristics of the runner chamber of the unit and the main factors causing the vibration of the runner chamber. The research results show that the vibration of the runner chamber is mainly caused by the slit jet, pressure pulsation and incorrect association relationship. Finally, repair suggestions and permanent treatment suggestions were put forward for the cracks in the runner chamber.