Author: R.-J. YangPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Turbine Blade Heat Transfer Prediction in Flow Transition Using K-w Two-equation Model
Author: R.-J. YangNumerical Simulation of Turbine Blade Heat Transfer Using Two-equation Turbulence Models
Author: Abdul Hafid M. ElfaghiPublisher:
ISBN:
Category : Turbines
Languages : en
Pages : 216
Book Description
The development of high performance gas turbines requires high turbine inlet temperatures that can lead to severe thermal stresses in the turbine blades, particularly in the first stages of the turbine. Therefore, the major objective of gas- turbine designers is to determine the thermal and aero-dynamical characteristics of the turbulent flow in the turbine cascade. This work is a numerical simulation of fluid flow and heat transfer in the turbine blade using different two-equation turbulence models. The turbulence models used here were based on the eddy viscosity concept, which determined the turbulent viscosity through time-averaged Navier-Stokes differential equations. The most widely accepted turbulence models are the two-equation models, which involves the solution of two transport equations for the turbulent kinetic energy, k, and its rate of dissipation, & or In the present simulation, four two-equation turbulence models were used, the standard k-& model, the modified Chen-Kim k-& model, RNG model and Wilcox standard k - OJ turbulence model. A comparison between the turbulence models and their predictions of the heat flux on the blade were carried out. The results were also compared with the available experimental results obtained from a research carried out by Arts et at. (1990) at the von Karman Institute of Fluid Dynamics (VKI). The simulation was performed using the general-purpose computational fluid dynamics code, PHOENICS, which solved the governing fluid flow and heat transfer equations. An H-type, body-fitted-co-ordinate (BFC) grid was used and upstream and downstream periodic conditions were specified. The grid system used was, sufficiently fine and the results were grid independent. All models demonstrated good heat transfer predictions for the pressure side except close to the leading edge. On the suction side, standard model over-predicted the heat transfer, whereas Chen-Kim, RNG and k - OJ models captured the overall behaviour quite well. Unlike k - OJ model, all k - & models generated very high turbulence levels in the stagnation point regions, which gave rise to the heat transfer rates close to the leading edge.
Prediction of Turbine Blade Heat Transfer by a Two-equation Turbulence Model
Author: Le Trong TranTWO-EQUATION TURBULENCE MODELS FOR PREDICTION OF HEAT TRANSFER ON A TRANSONIC TURBINE BLADE FINAL REPORT... NASA
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Prediction of Relaminarization Effects on Turbine Blade Heat Transfer
Author: Navier-Stokes Turbine Heat Transfer Predictions Using Two-equation Turbulence
Author: Ali A. AmeriPublisher:
ISBN:
Category : Navier-Stokes equations
Languages : en
Pages : 16
Book Description
Comparison of Two-equation Turbulence Models for Prediction of Heat Transfer on Film-cooled Turbine Blades
Author: Vijay K. GargPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Orlando, FL, Jun 2-Jun 5, 1997.
A Research Program for Improving Heat Transfer Prediction for the Laminar to Turbulent Transition Region of Turbine Vanes/blades
Author: Frederick F. SimonPublisher:
ISBN:
Category : Heat
Languages : en
Pages : 34
Book Description
Author: Rodney C. Schmidt
Author: Robert J. Boyle