Experimental and Numerical Study of the Effect of Flow Sepration on Dissipating Energy in compound Bucket

Abstract

In this research by making tree different buckets, separation effect has been analyzed. First model was a bucket with lip angle of 40 degrees and the two others were compound bucket which have two equally division in bucket width with different lip angel in each part; one of them has 20, 40 degrees angel and another one has 40, 80 degrees. The major amount of energy dissipation occurs in the region where the jet plunges into the tailwater; So the hydraulic jump sequent depth is used to evaluate energy dissipation at downstream. Experimental results showed that the compound bucket with less lip angle is more efficient. Also this paper discusses two and three-dimensional numerical modelling of bucket configurations using the CFD software Flow-3D and compares the fluid depth curves and Energy loss to corresponding physical model experimental values. The numerical model results were generally in agreement with physical model data.