Determination of heat loads is a key issue in the design of gas turbines. In order to optimize the cooling, an exact knowledge of the heat flux and temperature distributions on the airfoils surface is necessary. Heat transfer is influenced by various factors, like pressure distribution, wakes, surface curvature, secondary flow effects, surface roughness, free stream turbulence and separation. All these phenomenon are challenges for numerical simulations. Among numerical methods, Large Eddy Simulations (LES) offers new design paths to diminish development costs of turbines through important reductions of the number of experimental tests. In this study, LES is coupled with a thermal solver in order to investigate the flow field and heat transfer around a highly loaded low pressure water-cooled turbine vane at moderate Reynolds number (150 000). The meshing strategy (hybrid grid with layers of prisms at the wall and tetrahedra elsewhere) combined with a high fidelity LES solver gives accurate predictions of the wall heat transfer coefficient for isothermal computations. Mesh convergence underlines the known result that wall-resolved LES requires discretisations for which y+ is of the order of one. The analysis of the flow field gives a comprehensive view of the main flow features responsible of heat transfer, mainly the separation bubble on the suction side that triggers transition to a turbulent boundary layer and the massive separation region on the pressure side. Conjugate heat transfer computation gives access to the temperature distribution in the blade, which is in good agreement with experimental measurements. Finally, given the uncertainty on the coolant water temperature provided by experimentalist, uncertainty quantification allows apprehending the effect of this parameter on the temperature distribution.
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ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
June 3–7, 2013
San Antonio, Texas, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5515-7
PROCEEDINGS PAPER
Large-Eddy Simulation and Conjugate Heat Transfer Around a Low-Mach Turbine Blade
Florent Duchaine,
Florent Duchaine
CERFACS, Toulouse, France
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Nicolas Maheu,
Nicolas Maheu
CORIA, Saint-Etienne du Rouvray, France
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Vincent Moureau,
Vincent Moureau
CORIA, Saint-Etienne du Rouvray, France
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Guillaume Balarac,
Guillaume Balarac
LEGI, Grenoble, France
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Stéphane Moreau
Stéphane Moreau
Université de Sherbrooke, Sherbrooke, QC, Canada
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Florent Duchaine
CERFACS, Toulouse, France
Nicolas Maheu
CORIA, Saint-Etienne du Rouvray, France
Vincent Moureau
CORIA, Saint-Etienne du Rouvray, France
Guillaume Balarac
LEGI, Grenoble, France
Stéphane Moreau
Université de Sherbrooke, Sherbrooke, QC, Canada
Paper No:
GT2013-94257, V03BT11A004; 14 pages
Published Online:
November 14, 2013
Citation
Duchaine, F, Maheu, N, Moureau, V, Balarac, G, & Moreau, S. "Large-Eddy Simulation and Conjugate Heat Transfer Around a Low-Mach Turbine Blade." Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. Volume 3B: Heat Transfer. San Antonio, Texas, USA. June 3–7, 2013. V03BT11A004. ASME. https://doi.org/10.1115/GT2013-94257
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