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Experimental and Numerical Investigation of Flow Conditions over Laleli Dam Spillway

Author(s): Ismail Aydin; Mustafa Gogus; Mete Koken; A. Burcu Altan-Sakarya

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Abstract: The Laleli dam is located on the Coruh river in North-East Turkey. The Laleli dam spillway is laid on the downstream face of the dam body. The spillway channel starts with a gate controlled ogee crest followed by a linear prismatic channel section having a slope of 1. 43 and the structure is terminated with a flip-bucket type deflector. Elevation difference between the reservoir water surface and the downstream end of the flip-bucket is 110 m. Hydraulic model of the spillway was constructed at a length scale of 1/25 based on the Froude similarity law. The entrance conditions, flow around the dividing walls, water depths and the pressure distributions all along the centerline of the spillway chute were investigated. After determining the locations of negative pressures over the spillway chute to eliminate the risk of cavitation, an aeration facility was designed to aerate the flow from the underneath separation nappe. The location, geometric details and performance of the aeration facility were investigated. A numerical study was also conducted using the Flow-3D commercial CFD code to simulate the flow conditions in the model scale. Pressure distribution and the cavitation number were calculated along the spillway. Overall it ha been observed that there is an agreement between th experimental and numerical model results.


Year: 2012

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