Validation of the “stage – diffuser” system numerical study and its use for design modernization

The efficiency of a gas turbine largely depends on the aerodynamics and pressure recovery capacity diffuser. For reliable numerical simulation flow in diffuser, model must be validated basis experimental data structure. An study stage diffuser system was carried out. results this investigation are as follows: area applicability method for assessing determined; recommendations preparing transferring boundary conditions from domain to were developed; importance profiling last ensure unseparated entry into is indicated; influence hub length geometry struts losses its determined. It shown that increasing certain limits improves ratio smallest thickness gives best results; tangential axial slope does not make significant contribution nominal operating mode turbine.