Fluid flow analysis through a draft tube of a water turbine type 1

U ovom je završnom radu napravljen pregled teorije vodnih turbina, navedena je njihova podjela te su navedene njihove razlike i opisane su različite vrste vodnih turbina. Detaljnije je objašnjen princip rada difuzora, opisane su vrste difuzora i napravljena je analiza smanjenja gubitaka korištenjem difuzora. U završnom dijelu završnog rada opisan je program Ansys Fluent. Nakon toga je izrađena numerička mreža za zadanu geometriju te je zatim napravljena 3D analiza strujanja kroz difuzor. Rezultati simulacije koji se odnose na tlakove i brzine u sustavu su naposljetku grafički prikazani i analizirani koristeći se teorijom iz prethodnih dijelova završnog rada.In this thesis an examination was made concerning the theory behind water turbines, it discusses their division, it discusses their differences and different types of water turbines are descriped. It describes the principles of draft tube operation in greater detail, it describes different types of draft tubes and an analysis of the reduction of output losses by using a draft tube is written. In the final part od the thesis, the program Ansys Fluent is described. After that a mesh is made for the given geometry and then a 3D fluid flow analysis through the draft tube is made. The simulation results which pertain to pressures and velocities in the system are graphically presented and analyzed using theory from the previous parts of this thesis