Analysis of fluid flow in gas turbine EGH model subjected to large circular component of velocity

Cilj ovog rada jest istražiti utjecaj strujanja dimnih plinova na aerodinamički oblikovanu oplatu nosača izlaznog dijela kućišta plinskih turbina. Poseban naglasak jest istraživanje ulaznog kuta nastrujavanja na pojavu sila na aerodinamički profilirani dio oplate koji je oblika rijetke statorske rešetke s ravnim lopaticama. Usvojen je dvodimenzijski model strujanja na srednjem radijusu strujnog prostora. Geometrijski model izrađen je u programskom paketu Salome, diskretizacija prostora obavljena paketom cfMesh, a proračun paketom OpenFOAM. Proračun je izveden za slučaj s jednom lopaticom te slučaj s tri lopatice u nizu. Kutovi nastrujavanja su u rasponu od 0° do 60°. Područje proračuna ispunjeno je mrežom konačnih volumena pretežno heksaedarskog oblika, uz odredena profinjenja uz lopatice i vanjske granice područja. Svi proračuni izvršeni su primjenom programa za rješavanje modela nestacionarnog strujanja. U radu su prikazana polja različitih fizikalnih veličina te je izvršena analiza rezultata.The aim of work thesis is to investigate the influence of the flow of flue gases to the aerodynamically shaped shell carrier output of the casing gas turbines. Special emphasis is to study how the inputangleaffectsontheaerodynamicprofiledpartofthecasing,whichisarareformofthestator bars with straight blades. The two-dimensional flow model at the middle radius of the casing model was assumed. Geometric model is made in the software package Salome, spatial discretization in cfMesh package, and calculations in OpenFOAM. Calculations are made for the model consisting of one aerodynamicprofiledpartandforthemodelconsistingofthreeaerodynamicprofiledparts. Theswirlangles applied where in the range from 0◦ do 60◦. The finite volume meshes consisted of predominantly regular hexahedral volumes with necessary refinements on blades and external borders. Allcalculationswereperformedusingtheprogramforsolvingunsteadyfluidflowmodel. This work describes the different fields of physical quantities and the results have been analysed