Abstract
Cavitation causes serious damages to Francis turbine, e.g., noise and vibration. Its mechanism is complex and may be affected by many factors. The present paper compares cavitation behavior of flow in a Francis turbine with different content of non-condensable gas (NCG) concluded from experiment and numerical simulations. The experimental results show small difference in characteristics of cavitation with different content of non-condensable gas, while numerical simulation shows larger difference. It thus can be concluded that present simulation over-predict this difference.
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