A conservation-based discretization approach for conjugate heat transfer calculations in hot-gas ducting turbomachinery components

Papanicolaou, E.; Giebert, Dietmar; Koch, Rainer; Schulz, Achmed

doi:10.1016/s0017-9310(01)00017-5

Cited by 30 publications

(14 citation statements)

References 24 publications

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“…Studies including both experimental and computational conjugate heat transfer results provide important comparisons for validation of computational design tools. Papanicolaou et al [11] compared computational simulations of conjugate heat transfer to experimental measurements made on a flat plate with film cooling for a Bi ~ 3 and a Bi ~ 0.08. Their effectiveness results highlighted the large differences in temperature distribution that are observed for experiments with different Bi.…”

Section: Relevant Literaturementioning

confidence: 99%

Conjugate heat transfer analysis of the effects of impingement channel height for a turbine blade endwall

Mensch

Thole

2015

International Journal of Heat and Mass Transfer

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Advancements in cooling for applications such as gas turbines components require improved understanding of the complex heat transfer mechanisms and the interactions between those mechanisms. Critical cooling applications often rely on multiple thermal protection techniques, including internal cooling and external film cooling in gas turbine airfoils, to efficiently cool components and limit the use of coolant. Most research to quantify the effectiveness of such cooling technologies for gas turbine applications has isolated internal and external cooling in separate experiments. The research presented in this paper uses a conjugate heat transfer approach to account for the combined effects of both internal and external cooling. The geometry used for this study is a turbine blade endwall that includes impingement and film cooling as well as the relevant conduction through the endwall. Appropriate geometric and flow parameters were scaled to ensure engine relevant dimensionless temperatures were obtained. Using the conjugate heat transfer approach, the effect of varying the height of the impingement channel was examined using spatially resolved external wall temperatures obtained from both experiments and simulations. A one-dimensional heat transfer analysis was used to derive the average internal heat transfer coefficients from the experimental results. Both experiments and simulations showed good agreement between area averaged cooling effectiveness and impingement heat transfer coefficients. The cooling effectiveness and heat transfer coefficients peaked for an impingement channel height of around three impingement hole diameters. However, the heat transfer coefficients were more sensitive than the overall effectiveness to the changes in height of the impingement channel.

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Section: Relevant Literaturementioning

confidence: 99%

Conjugate heat transfer analysis of the effects of impingement channel height for a turbine blade endwall

Mensch

Thole

2015

International Journal of Heat and Mass Transfer

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“…In the rear part, as shown also by Papanicolau [1], the difference is generated by the boundary conditions imposed on the numerical model. More precisely, the adiabatic condition at the extreme surfaces of the blade does not represent the real conditions of the test.…”

Section: Fig 4-film Cooled Flat Plat Dimensions In MMmentioning

confidence: 99%

A finite-volume method for the conjugate heat transfer in film cooling devices

Montomoli

Adami

Martelli

2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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The present work concerns the activity performed to upgrade an in house finite volume CFD solver for computing heat transfer in gas turbine cooling devices. The "conjugate simulation" of fluid heat transfer and metal heat conduction has been considered. To this aim the original code has been coupled to a new one solving the Fourier equation in the solid domain. This modification allows the "conjugate heat transfer" investigation in the fluid and solid domains at the same time.The approach has been validated through two different test-cases. The first one is a two dimensional laminar flow over a flat plate, the second one is a film-cooled plate. A more complex application is also shown as an example of complete film cooled stage. In this example the complete cooling system of the nozzle has been modeled, including the two plenums and six rows of cooling channels as well.

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“…The resolution of the CHT problem relies on the coupling between a flow solver and a conduction code that exchange boundary conditions at their interface [22]. This solution has the advantage of using existing state-of-the-art codes to solve fluid and solid equations [26][27][28][29][30][31]. Uncertainty quantification of the solid model parameterization is studied in order to gauge the sensitivity of the coupled results to experimental uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation and Conjugate Heat Transfer Around a Low-Mach Turbine Blade

Duchaine

Maheu²,

Moureau

et al. 2013

Journal of Turbomachinery

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International audienceDetermination 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. Each of these phenomenons is a challenge 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 discretizations 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 for 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 experimentalists, uncertainty quantification allows apprehension of the effect of this parameter on the temperature distribution

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A conservation-based discretization approach for conjugate heat transfer calculations in hot-gas ducting turbomachinery components

Cited by 30 publications

References 24 publications

Conjugate heat transfer analysis of the effects of impingement channel height for a turbine blade endwall

Conjugate heat transfer analysis of the effects of impingement channel height for a turbine blade endwall

A finite-volume method for the conjugate heat transfer in film cooling devices

Large-Eddy Simulation and Conjugate Heat Transfer Around a Low-Mach Turbine Blade

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