Abstract：Considering for GD008—WZ—140 shaft extension tubular turbine in some hydropower station,which has serious problems such as loss effort,vibration and noise,CFD was used to study the main reason of the problems.Based on the simulation results and performance prediction,the LGD08—WZ—140 runner was designed.The flow in the new runner coupled with the original flow passage was stimulated.The results of performance prediction and trial operation show that,the power can exceed the original design standard requirements,the noise reduces from 95 dB to 83 dB,and the vibration is basically eliminated.Therefore,the transformation of this runner is a success.
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