Proceedings of the 1st International Conference on Mechanical Engineering and Material Science (MEMS 2012)

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Comparison of Three Different Two-equation Turbulence Models in Predicting Narrow Trench Film Cooling Effectiveness

Authors
Antar M.M. Abdala, Fifi N.M. Elwekeel, Zheng Qun
Corresponding Author
Antar M.M. Abdala
Available Online December 2012.
DOI
10.2991/mems.2012.187How to use a DOI?
Keywords
Gas turbine; Narrow trench; Film cooling; Adiabatic effectiveness; Jet interaction phenomena
Abstract

In this study, three turbulence models k-, standard k-  and SST Gamma Theta which all available in ANSYS CFX were used. Gamma Theta Model is the recommended transition model for general-purpose applications. The full transition model is based on two transport equations, one for the intermittency and one for the transition onset criteria in terms of momentum thickness Reynolds number. Narrow trench configuration is used to predict the improvements in film cooling performance. Blowing ratios in the range (0.5, 1 and1.4) were investigated. The results compared with experiments at different blowing ratios. Comparison of results with the k- model indicates that each SST Gamma Theta and k- models predict circulations inside trench equally well at M=1. Over the surface, at low blowing ratios all models in case lateral spreading are under predicted, but SST Gamma Theta model shows some improvements in prediction than k-. At high blowing ratios, SST Gamma Theta model offers good prediction in centerline with experiment than others, but all models show under predicted in lateral direction.

Copyright
© 2012, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the 1st International Conference on Mechanical Engineering and Material Science (MEMS 2012)
Series
Advances in Intelligent Systems Research
Publication Date
December 2012
ISBN
10.2991/mems.2012.187
ISSN
1951-6851
DOI
10.2991/mems.2012.187How to use a DOI?
Copyright
© 2012, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

risenwbib
TY  - CONF
AU  - Antar M.M. Abdala
AU  - Fifi N.M. Elwekeel
AU  - Zheng Qun
PY  - 2012/12
DA  - 2012/12
TI  - Comparison of Three Different Two-equation Turbulence Models in Predicting Narrow Trench Film Cooling Effectiveness
BT  - Proceedings of the 1st International Conference on Mechanical Engineering and Material Science (MEMS 2012)
PB  - Atlantis Press
SP  - 713
EP  - 716
SN  - 1951-6851
UR  - https://doi.org/10.2991/mems.2012.187
DO  - 10.2991/mems.2012.187
ID  - M.M.Abdala2012/12
ER  -