Many researchers have put much attention on gas turbine blades because of their wide applications in industry. So having information about the characteristics of fluid flow through gas turbine blades seems to be critical. Because of this importance, some of the parameters which are effective on simulating fluid flow through gas turbine blades are investigated by the use of CFX software. Numerical grid which is one of the investigated parameters has significant effect on numerical results. So grid sensitivity has been investigated as the first step. Defining the turbulence model is another important parameter in this project. Four turbulence models such a K-?, K-?, SST and RSM are used to predict heat transfer and aerodynamic parameters for C3X stator blade. Pressure distribution around the blade was predicted almost identical by the use of different turbulence models. But in predicting wall temperature around the blade, SST model shows better results comparing to other models since it has less than 1.5 percent error comparing to experimental results. Also in this project the effect of different turbulence intensities on aerodynamic and heat transfer characteristics of midspan, hub and shroud of the stator blade are investigated. By increasing turbulence intensity, heat transfer rate increases at midspan but decreases at hub and shroud. Viscous work is the last parameter which is analyzed in this project. This term exists in energy equation and its effect is significant in high speed flows. The analysis shows that this term is more effective when turbulence intensity is higher. Another object of this project is to investigate the importance of these parameters comparing to each other. This means that which of these parameters are more important in simulating fluid flow through gas turbine blades. Using a good turbulence model is the most important parameter in gas turbine simulation. After that turbulence intensity, numerical grid and viscous work have lower effects in gas turbine simulation comparing to turbulence model. Finally a comparison between different Reynolds Stress Turbulence models (RSM) is investigated in order to find the best one for predicting the fluid flow through gas turbine stator blades. The primary difference between these models is the use of ? or ? equation. The results of models using ? equation are close to experimental data but SST model shows the best results comparing to all turbulence models used in this project. Key Words: Turbulence models, turbulence intensity, viscous work, numerical grid, Reynolds Stress Turbulence models (RSM), CFX software.
