Hassan Saghi ¹, Abdolamir Bak Khoshnevis ², Ali Saman ²

Affiliations
1 Department of Civil Engineering, Hakim Sabzevari University, IR
2 Department of Mechanical Engineering, Hakim Sabzevari University, IR

Abstract

In this paper, the effect of quarter cylinder obstacles on hydraulic jump in a rectangular channel has been studied in the laboratory. The quarter-cylindrical obstacles with 2 and 3 cm diameter are considered and the effect of their position and height are studied in the hydraulic jump parameters such as location, energy dissipation and Froude number. The flume used in this research has six meter long, 20 cm wide and 30 cm height. The reason of quarter-cylindrical shape selection for obstacles is reduce the amount of erosion relative to other shapes such as rectangular and trapezoidal obstacles. The obstacles are installed at the end of the channel. Distance between the first obstacle and the beginning of the channel is constant. Totally, 44 tests have been carried out in this research. The results show that increasing distance between the obstacles to a certain amount, increases energy dissipation. But energy dissipation decreases for further distance. Furthermore, optimum s/r increases with increase in the obstacles height.

Keywords

Energy Dissipation, Froude Number, Hydraulic Jump, Obstacle

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