COMPARISON OF EXPERIMENTAL AND THEORETICAL STUDY OF HYDRAULIC JUMP IN RECTANGULAR CHANNEL

Abstract

Hydraulic jump is a phenomenon caused by change in stream regime from supercritical to sub – critical flow with considerable energy dissipation and rise in depth of flow. Hydraulic jump primarily serves as energy dissipater to dissipate excess energy of flowing water downstream of hydraulic structures,such as spillway, sluice gates etc. This excess energy,if left unchecked, will have adverse effect on the banks and the bed. The reason for carrying out this study is the application of hydraulic jump in various fields. The main reason for using hydraulic jump as energy dissipater is to reduce the scouring. Hydraulic jump can be used to prevent the scouring action on the downstream side of the dam structure. In the present study change in the hydraulic jump characteristics are studied for various slopes experimentally and theoretically using and CFD simulation of the flow carried out using the ANSYS CFX software. The result of experimental and theoretical work has been compared .The experiments were carried out in the rectangular flume installed in the hydraulic laboratory of the Delhi Technological University. Characteristic features like efficiency, relative height of the jump, energy loss, sequent depth ratio, height of the jump are calculated for different slopes experimentally and by using ANSYS CFX software and found experimental results were fairly matched with theoretical results