Numerical Simulation Study on Hydraulic Characteristics of High Head Large Discharge Spillway Tunnel

The hydraulic characteristics of spillway tunnel of Xiluodu Hydropower Station with high head large discharge in Jinsha River has been simulated by the k-eturbulence model and Volume of Fluid(VOF) method.The hydraulic parameters including flow process,discharge coefficient,river surface profile,distribution of velocity,pressure,cavitation numbers and aeration quantity have been obtained.And the influence of safe on the spillway tunnel is analyzed.The results show that the discharge capacity meets design requirements;the design shape is reasonable basically;spillway tunnel curving segment need to be optimized;the length and height of the second and third aeration cavity are too small;the wind speed in ventilation shaft is too big,which makes the aeration bank need to be optimized.