Problem: There was serious cavitation problem at the blade outlet and it needed to be stopped and polished every year, affecting seriously the power station operation.
New runner model: HLGT153A-LJ-150
Solution: Trough CFD analysis, we designed a new runner, the pressure value on the back surface of the new runner blade is significantly higher than that of the original runner, successfully solving the cavitation problem.
Meanwhile, the new runner efficiency improved compared to the old one at load range of 40%-110%, and the efficiency at rated point increased 5% and weighted efficiency increased 7%. The maximum output increased from 15.13 MW to 16.17MW at 0.56 m head, and also the unit stability is improved and noise level is reduced.
Before rehabilitation/after rehabilitation