| Abstract: | | 1. |
During the first years of operation of the turbines of the Ust'-Ilim hydrostation (1974–1979) increased cavitation erosion of the runner blades were noted. Blades with a maximum deviation of the geometry from the design had maximum erosion. Correction of the blade profile with the use of a three-dimensional template markedly reduced the intensity of cavitation erosion.
| | 2. |
Tests established that the best operating regimes of the units of the Ust'-Ilim hydrostation with respect to cavitation conditions is the load range 195–215 mW, deviations from which lead to a pronounced increase of cavitation erosion.
| | 3. |
A change in the profile of the trailing edges of the runner blades practically completely eliminated cavitation erosion on the rear surface of the blades near the trailing edges.
| | 4. |
Tests with hard-facing of the damaged blades by various electrodes showed the possibility of a substantial increase of the cavitation resistance of the hard-faced coating and accordingly an increase of the overhaul period with the use of electrodes of type TsN-22. It is required to organize immediately the production of cavitation-resistant electrodes, which are acutely needed for restoring cavitation damages of turbine runners.
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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 2, pp. 40–42, February, 1988. |
