Add to ORKGU ovome radu se opisuju tipovi vodnih turbina, vrste difuzora, i gubici u hidroenergetskim sustavima, te analizira numerička simulacija protoka fluida kroz difuzor Francisove turbine u dva režima u programu Ansys Fluent, kako bi se došlo do zaključaka o promjenama tokova strujanja i gubitaka kod prostrujavanja vode iz turbine kroz difuzor.This paper describes the types of water turbines, types of draft tubes, losses in hydropower systems, and analyzes the numerical simulation of fluid flow through the draft tube of a Francis turbine in two regimes, in the Ansys Fluent program, in order to reach conclusions about changes in flow rates and losses at water flow from the turbine through the draft tube