Measurement & Analysis of Labyrinth Leakage in Francis Turbines

2019

Master's thesis Renewable Energy ENE500 - University of Agder 2019 Thismaster’sthesisis discussing the potential of measured leakage water from Francis turbines in Brokkeand Holenpower plants. There is a leakage that represent a loss, coming from the labyrinth seals in the turbines’runners (crown and band side),and this leakage will increase over time.For this report theleakage from the upper labyrinth side (crown) has been measured.The leakage is different between the four Francis turbines at Brokke and between the three Francis turbines at Holen power station.Portaflow 220Bhas been used, whichis a flow instrument using ultrasonic sound. The measuring instrument was tested and verified bef…