NUMERICAL SIMULATION OF THREE-DIMENSIONAL TURBULENT FLOW THROUGH TURBINE SPIRAL CASING

摘要

In order to understand the flow patterns through a spiral casing of the model turbine for the Sanxia hydropower project, the three-dimensional flow through the spiral casing is investigated by numerical flow analysis. The SIMPLEC algorithm with body-fitted coordination and staggering grid system is used for the solution procedure of the discretized equations based on the Navier-Stokes equations and the standard k-ε model. The calculated results show the velocity distribution in the spiral casing agrees well with the design hypothesis V_ur = const at the design operation conditions.