The Francis hydro-turbine is a typical nonlinear system with coupled hydraulic, mechanical, and electrical subsystems. It difficult to understand the reasons for its operational failures, since main cause of failures due complex interaction three This paper presents an improved dynamic model hydro-turbine. study involves development hydraulic unit, given start-up emergency processes, considerat...

Abstract The present work investigates the effect of axial water jet nozzle size on unsteady pressure fluctuations arising from RVR formation in draft tube a Francis turbine operating at part load. results compare two different diameter jets for their pulsations and recovery tube. Simulations were carried out four injections varying 2% to 10% main discharge. study also presents changes net effe...