NUMERICAL SIMULATION OF EFFECT OF TURNING RADIUS ON ICE REMOVAL IN BEND CHANNEL OF DIVERSION TYPE POWER HOUSE

The ice damage of diversion channel is dangerous to the hydropower station operation, even results in great life losses, so the operation mode of the ice delivery and sluicing is key to diversion-type hydropower station in winter. A 3D unsteady Eulerian two-phase model is developed. The momentum transfer term includes the drag, virtual mass, lift forces, and density difference. The results under different turning radius are as follows: When the turning radius is 200m, the water flow is steady, the water velocity distribution is homogeneous, the amount of floating ice reaches its maximum, and the ice removal efficiency is the highest. Therefore, the optimum turning radius is 200m, and the reasonable design of ice gate can ensure the smooth removal of ice and the safety operation of hydropower station. The prediction by the present model for ice removal of bend channel is confirmed by the experimental results of open channel bend reported by Blanckaert.