INVESTIGATION OF DRAFT TUBE PROFILES TO INCREASE THE EFFICIENCY OF BANKI TURBINE-BASED ON CFD SIMULATION Sirojuddin, Fadilah Chaerul Iman, Prima Chandra Utama, Darwin Rio Budi Syaka, and Imam Basori.
Universitas Negeri Jakarta
Abstract
Increasing efficiency is very important in banki water turbine. One of the method to increase efficiency was modified the profile of draft tube so the kinetic energy of the turbine could be converted into pressure energy maximaly. The aim of this research was to investigate variations of draft tube profile from 5 variants. The geometry of the draft tube drwan in 2D and 3D software. From the 3D geometry was simulated in CFD software. Inlet mass flow was 0,0333 m3/s, head was 5,5 m. Based on the result of the simulation with CFD software Flow Simulation it was found that the best efficiency reach 88,4% and the flow trajectories at the first stage and the second stage blade of runner reaching the best flow trajectory and didn’t strike the shaft of the runner.
