Determination of Critical Submergence Depth at Horizontal Intakes under Asymmetric Flow Conditions.

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Mustafa Gogus, Mete Koken, Cihan Zaloglu, Emre Haspolat

Friday 3 july 2015

8:30 - 8:45h at Africa (level 0)

Themes: (T) Water engineering, (ST) Hydraulic machinery and industrial flows, (T) Special session, (ST) Design of intake stations

Parallel session: 14D. Special session: Design of intake stations

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The purpose of the present study is to investigate the hydraulic conditions of air-entraining vortices under asymmetrical flow conditions and derive a general expression to determine the critical submergence depth required for the formation of these vortices at horizontal intake pipes. A series of experiments were conducted in a model composed of a concrete reservoir and intake pipe which was mounted horizontally to the reservoir. Three pipes of different diameters were tested with adjustable plexiglass side walls to investigate the effect of side-wall clearances on the critical submergence depth. Based on the experimental results obtained from a wide range of side-wall clearances and discharges, empirical equations for the critical submergence depth were derived and compared with Gordon`s (1970) relationship. Keywords: Horizontal intakes, air-entraining vortices, asymmetric flow condition, critical submergence depth.