Document Type : Research Article
Authors
1 Azad University of South Tehran
2 water and power industry (Shahid Abbas poor)
Abstract
Abstract
The diversion flow pattern is quite 3-D and nonuniform. In general, diversion flow occurs either naturally like streams or artificially like lateral intakes. According to the performed investigations the intake location affects the rate of diversion discharge and entry of sediments to the diversion channel. Since the main purpose of lateral intakes is to facilitate water transfer without sediments, and most rivers are zigzagged through their path, therefore, more research on the location of the lateral intake and its angle in the bending channels seems necessary. For this purpose, to determine the velocity and secondary flow fluctuations caused by hydraulic parameters changes in domain of lateral intakes with no diversion dam in winding channels a U-shaped flume with rectangular cross section was built. A straight channel with rectangular cross-section was used as a diversion channel. Based on the past researches, water intake was performed from the outer bend with 60˚ diversion angle at different locations (40˚, 75˚, 115˚) and with Froude numbers 0.27, 0.41, and 0.55, respectively. The obtained results of velocity distribution, secondary flow strength and radial flow momentum in a bend channel with diversion channel showed that the maximum variation of the above hydraulic parameters occur in the intake entrance.
Key words: Bend channel, lateral intake, Velocity distribution, Secondary flow
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