STUDY OF HYDRAULIC JUMP FOR DIFFERENT SEQUENT DEPTH RATIOS

Abstract

When the flow takes place from supercritical flow to subcritical flow, the hydraulic jump occurs. A hydraulic jump occurs when a supercritical stream meets a subcritical stream of sufficient depth, and it is usually accompanied by large-scale turbulence at downstream, which dissipates the majority of the kinetic energy in the supercritical flow. The hydraulic jump majorly acts as the dissipator of the energy that dissipates the excess energy of water flowing downstream in different types of hydraulic structures. This study investigates the hydraulic jump characteristics in a rectangular open channel flume provided with sluice gates at both the ends of the flume. The experimental study was conducted on a 10 m long rectangular flume having a width of 0.30 m and height of 0.40 m and the two sluice gate is 3 m apart. This Project was mainly carried out to understand the different characteristics of the hydraulic jump, studied both analytically and experimentally, including various result in the form such as conjugate depth relation (𝑦2 𝑦1 ), length of the jump, relative loss of energy (𝐸𝐿 𝐸1 ) of the jump, and water profile of the jump. In total, 15 number of sample experiments was performed with inflow Froude’s number (F1) varying from 1.55 to 1.73. It is concluded that sequent depth ratio and length of the jump decreases with increase in the slope while the relative energy loss (𝐸𝐿 𝐸1 ) increases with increase of the pre-jump Froude’s number (F1) for different slopes. The height of the jump increases with the increase in the length of the jump forming the M3 water profile of the jump. The discharge at each point is nearly equal, indicating that there is a continuous flow. This experimental study is in agreement with previous studies of water profile done by various researchers.