ABSTRACT
Turbine blade heat transfer is a very important engineering problem characterized by high turbulence levels and very complex flow fields. The prediction of turbine blade heat transfer is very important, especially when turbine inlet temperature increases.
This paper is about numerical predictions of flow fields and heat transfer to gas turbine blades using different two-equation turbulence models. Four two-equation turbulence modeles were used, the standard k – ε model, the modefied Chen-Kim k – ε model, RNG model and Wilcox standard k – ω turbulence model. These models are based on the eddy viscosity concept, which determines the turbulent viscosity through time-averaged Navier-Stocks differential equations.
The simulation was performed at Aerospace Engineering Department, University Putrra Malaysia (UPM) using the general-purpose computational fluid dynamics code, PHOENICS, which solves the governing fluid flow and heat transfer equations. An H-type, body-fitted-coordinate (BFC) grid is used and upstream with downstream periodic conditions specified.
The results are compared with the available experimental measurements obtained from a research carried out at the Von Karman Institute of Fluid Dynamics (VKI). A comparison between the turbulence models and their prediction of heat flux on the blade is carried out.
