DISCUSSION ON MECHANISM OF CAVITATION DAMAGE ON SUPER HIGH DAMS

摘要

In this short paper the following viewpoints are discussed: it is possible in super high dams that the discharge flow, either in discharge tunnel or in open channel, may be an air-water mixtures (two-phase flow) in which the sound speed could reduce sharply depending on concentration of air and the shock wave could be caused somewhere in super high flow while the flow velocity reaches or exceeds the sound speed in it. Besides bubble collapse, the correlation between shock wave and cavitation bubble collapse should be considered as the main mechanism of serious damage on discharge structures of super high dams.