Study on the Effect of the Guide Vane Opening on the Band Clearance Sediment Erosion in a Francis Turbine

Sediment erosion is a negative phenomenon for the water turbine. The purpose of this paper to study effect guide vane opening on particle motion and sediment in band chamber using Euler–Lagrangian approach. software Ansys CFX Tabakoff model are used simulate laden flow full passage hydraulic results good agreement with actual character site. Results show that has positive correlation non-clearance channel. increase will runner blade head, but friction wear outlet side surface decrease. rotating action makes particles rotate rapidly around center constantly collide wall. Under small opening, smaller easier leakage clearance occurs. unsteady disturb trajectory particles, change impact angle affect chamber. different openings, law closely related leakage.