External Heat Transfer Predictions in a Highly-Loaded Transonic Linear Turbine Guide Vane Cascade Using an Upwind Biased Navier-Stokes Solver

Gehrer, Arno; Jericha, Herbert

doi:10.1115/98-gt-238

Cited by 9 publications

(7 citation statements)

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“…The eddy viscosity is modelled using the oneequation turbulence model of Spalart and Allmaras (1994) and the low-Reynolds-number k-ε model of Biswas and Fukuyama (1994). Both models were validated against simple flows, such as a flat plate boundary layer and showed good agreement with published experimental results (Artner, 1997, Gehrer and Jericha, 1999, Gehrer 1999). Spalart-Allmaras (1994).…”

Section: Numerical Approachmentioning

confidence: 80%

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Numerical and Experimental Investigation of Trailing Edge Vortex Shedding Downstream of a Linear Turbine Cascade

Gehrer

Lang

Mayrhofer

et al. 2000

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

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In this study, the evolution of the unsteady trailing edge vortex street downstream a linear turbine cascade is experimentally and computationally investigated. In a transonic cascade test stand, Laser Doppler velocimeter (LDV) measurements were acquired in several axial planes downstream of the blade trailing edge. In addition, direct detection of density changes near the trailing edge provide information about the frequency of a vortex shedding cycle. A two-dimensional upwind-biased Navier-Stokes solver has then been used to perform a series of steady and unsteady cascade simulations, allowing an in-depth study into the mechanisms of the trailing edge vortex shedding. The numerical results are compared with the experimental data to test the quality of the numerical simulations.

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Section: Numerical Approachmentioning

confidence: 80%

“…Navier-Stokes Solver. The flow solver used in this work is based on the time-marching Euler code of Sanz et al (1995) and described in detail by Gehrer (1999). Here only a brief outline of the main features of the Navier-Stokes code is given.…”

Section: Low Reynolds Number K-ε Model Ofmentioning

confidence: 99%

Numerical and Experimental Investigation of Trailing Edge Vortex Shedding Downstream of a Linear Turbine Cascade

Gehrer

Lang

Mayrhofer

et al. 2000

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

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“…Based on this state-of-the-art, this paper proposes to investigate the prediction of heat transfers in a highly loaded turbine guide vane, by means of structured and unstructured flow solvers. The test case is a well documented configuration [11] representative of a modern turbine blade and extensively used for CFD validation [3,12]. The first section of the paper details the main parameters of this configuration.…”

Section: Introductionmentioning

confidence: 99%

Advanced Numerical Simulation Dedicated to the Prediction of Heat Transfer in a Highly Loaded Turbine Guide Vane

Gourdain

Duchaine

Gicquel

et al. 2010

Volume 7: Turbomachinery, Parts A, B, and C

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This paper proposes to investigate the capacity of numerical simulation to estimate wall heat fluxes in a highly loaded turbine guide vane (with both structured and unstructured flow solvers). Different numerical approaches are assessed, from steady-state methods based on the Reynolds Averaged Navier-Stokes (RANS) equations to more sophisticated methods such as the Large Eddy Simulation (LES) technique. As expected steady flow simulations fail to predict the wall heat transfer, mainly because unsteady flows and laminar-to turbulent transition are not taken into account. The results underline the role of the vortex shedding, mainly through the emission of acoustic waves that interact with the suction side boundary layer. Only the LES (partially) succeeds to estimate wall heat fluxes since this method considerably improves the level of physical description (including boundary layer transition). However, the LES still requires validation and developments for such complex flows. This study also points out the dependency of results to the freestream turbulence intensity, which is a difficult parameter to manage with LES. Structured and unstructured flow solvers predict a different behaviour of the boundary layer (natural or by-passed transition), depending on the external turbulence intensity.

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“…In the past, algebraic turbulence models (the Baldwin-Lomax [3][4][5][6] or the Mitchel one [7]), one-equation models (the Spalart-Allmaras one [5; 7]) and two-equation (k − or k − ! ones, see References [6][7][8]) have been used for the analysis of the same problem.…”

Section: Introductionmentioning

confidence: 99%

“…In some of these works, criteria for the prediction of the onset of transition based on integral boundary layer quantities (the Abu-Ghannam and Shaw [9] or the Mayle model [1], which are both used in this work) or the integration of the growth rates of instability waves (the so-called e N model [4]) have been used. A few works in which the onset of transition was deÿned by the user can also be found (for instance Reference [5], using the SA model). As far as transition criteria are concerned, the previous works have shown that none of the aforementioned ones is clearly superior.…”

Section: Introductionmentioning

confidence: 99%

Transition and heat transfer predictions in a turbine cascade at various free‐stream turbulence intensities through a one‐equation turbulence model

Tsourakis

Koubogiannis

Giannakoglou

2002

Numerical Methods in Fluids

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SUMMARYThe one-equation Spalart-Allmaras turbulence model, coupled with criteria for the prediction of the transition onset, is employed for the numerical prediction of the heat transfer along the nozzle guide vanes of a high-pressure turbine, at various operating conditions. Emphasis is put on how to overcome a known shortcoming of the Spalart-Allmaras model, i.e. its insensitivity to free-stream turbulence. For this purpose, an extra viscosity coe cient is deÿned and used in the mean ow equations. This extra viscosity is proportional to the free-stream turbulence with a damping in the boundary layer. Its use is adequate to circumvent the aforementioned weakness of the Spalart-Allmaras model, without any other intervention in the model itself. For the prediction of the onset of transition, the Abu-Ghannam and Shaw and the Mayle criteria are used, depending on the level of free-stream turbulence. Both yield very satisfactory predictions in a wide range of Reynolds numbers and=or turbulence intensities. From a numerical point of view, this paper proposes techniques for the implementation of the solution method on unstructured grids with triangular elements and reconÿrms ÿndings of previous works, like the suitability of the containment-circle tessellation in highly stretched grids.

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External Heat Transfer Predictions in a Highly-Loaded Transonic Linear Turbine Guide Vane Cascade Using an Upwind Biased Navier-Stokes Solver

Cited by 9 publications

References 0 publications

Numerical and Experimental Investigation of Trailing Edge Vortex Shedding Downstream of a Linear Turbine Cascade

Numerical and Experimental Investigation of Trailing Edge Vortex Shedding Downstream of a Linear Turbine Cascade

Advanced Numerical Simulation Dedicated to the Prediction of Heat Transfer in a Highly Loaded Turbine Guide Vane

Transition and heat transfer predictions in a turbine cascade at various free‐stream turbulence intensities through a one‐equation turbulence model

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