Investigation of the Effect of Ramp Angle on Chute Aeration System Efficiency by Two-Phase Flow Analysis

Abstract

Flow aeration is one of the most effective and economical ways to prevent cavitation damage. Surface damage is significantly reduced when very small values of air are scattered in a water prism. A structure known as an aerator may be used for this purpose. Meanwhile, ramp angle is one of the factors that affects aerator efficiency. In this research, the value of air entraining the flow through the spillway of the Jarreh Dam in exchange for a change in the value of ramp angle in three different scenarios of 6, 8 and 10 degrees was simulated by Flow-3D software. In order to validate the results of the inlet air flow to the flow at a ramp angle of 6 degrees, the observational results of the physical model of the dam spillway were used in the physical model laboratory of Tamab Company. According to the results, raising the ramp angle increases the inlet air to the plane, and a ten-degree throwing angle provides the best aeration efficiency. The Flow-3D model can also simulate two-phase water-air flow on spillways, according to the results.