Two-phase Flow Characteristics of an Unsteady Dam Break Wave Flow
نویسنده
چکیده
Although field observations of sudden spillway releases highlighted strong aeration of dam break wave flows, no study investigated these two-phase flow characteristics. New original experiments were conducted down a 24 m long stepped waterways. Dam break wave propagation showed an equivalent flow resistance similar to steady flow conditions (f ~ 0.05). Detailed unsteady air-water flow measurements demonstrated very strong aeration of the wave leading edge : Cmean ~ 0.8 down to 0.4 for (t ts)* g/do < 1.2 while the air-water flow structure was very coarse. Void fraction distributions compared well with analytical models.
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