Abstract
The model test results show that the initial runner developed for LB HPP has the problem of clearance cavitation, which does not meet the design requirements of no cavitation in the whole operating range. In order to find out the reasons of clearance cavitation, and put forward the corresponding optimization method, the numerical simulation method is used to calculate the clearance flow inside runner on the basis of the entire passage calculation. By analyzing the pressure distribution on blade surface and the flow characteristics inside runner blade clearance, the reasons of clearance cavitation have been found, the initial runner blade has been optimized, and the secondary model test has been carried out. The results of the secondary model test show that the optimized runner blade can meet the design requirements.
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