A New Computational Approach to Hydraulic Transient Process for Diversion System of Hydropower Station

A governing equations of the hydraulic transient process for the diversion system of hydropower plant were developed, and the combination computation of the hydraulic transient process are performed by using 1-D and 3-D model, that is, 1-D model is used for the transient calculation of the entire diversion system, and 3-D model for the surge chamber which is a key part of the diversion system. The computational results of the water level fluctuation in surge chamber by 1-D model are fit to the experimental results, and the deviations are less than 0.8%. The detail pressure contours and velocity fields in the surge chamber are simulated with the 3-D model, hence the pressure difference of the bottom board of the surge chamber can be obtained and it is important for the structure design of the surge chamber.