Numerical Simulation of Combustor Flows on Parallel Computers: Practical Limitations and Practical Experience

Kurreck, Martin; Wittig, Sigmar

doi:10.1115/94-gt-404

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…The current numerical study was performed using a three-dimensional Navier-Stokes code. The capabilities and performance of this code have been demonstrated recently for a wide range of technical flow configurations (Benz et al (1993), Kurreck and Wittig (1994)) including heat transfer phenomena (Giebert et al (1996)). In this CFD code, the governing equations are formulated in a body-fitted non-orthogonal curvilinear co-ordinate system.…”

Section: Methodsmentioning

confidence: 99%

Film-Cooling From Holes With Expanded Exits: A Comparison of Computational Results With Experiments

Giebert

Gritsch

Schulz

et al. 1997

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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A 3D Navier-Stokes code, together with the standard k-ϵ model with wall function approach, was used to investigate the flowfield in the vicinity of three different single scaled-up film-cooling holes. The hole geometries include a cylindrical hole, a hole with laterally expanded exit, and a hole with forward-laterally expanded exit. Comparisons of numerical results with detailed flowfield measurements of mean velocity and turbulent quantities are presented for a blowing ratio and density ratio of unity. Additionally, experimental data for different blowing ratios and a density ratio of about two are taken to perform validation of the code for adiabatic film-cooling effectiveness prediction. Results show that for both the round and the expanded hole geometries the code is able to capture all dominating flow structures of this jet in crossflow problem. However, discrepancies are found when comparing the flowfield inside the hole and at the hole exit. In particular, jet location at the hole exit differs significantly from measurement for the expanded hole geometries. For the adiabatic film-cooling effectiveness, it is shown that for round and expanded hole exits the intensity of the shear regions and the source of turbulence, respectively, have a strong influence on the predictive capability of the numerical code.

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Section: Methodsmentioning

confidence: 99%

Film-Cooling From Holes With Expanded Exits: A Comparison of Computational Results With Experiments

Giebert

Gritsch

Schulz

et al. 1997

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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“…For the calculations of the reacting flow, a numerical code developed at the ITS (Kurrek and Wittig, 1994) has been used. This code is based on Finite Volume discretization and uses steady mean conservation equations for mass and momentum.…”

Section: Numerical Calculation Of the Reacting Flow Fieldmentioning

confidence: 99%

Validation of Numerical Methods at a Confined Turbulent Natural Gas Diffusion Flame Considering Detailed Radiative Transfer

Ganz

Schmittel

Koch

et al. 1998

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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Radiation heat transfer in flames depends strongly on local quantities such as pressure, temperature and concentration of participating species. In the present study, 3D numerical calculations of radiative heat transfer together with the reacting flow field are compared to detailed measurements of the velocity, temperature and spectral radiation field of a model combustor. The geometry of the combustion chamber (dch = 0.5m), the flame configuration (type-II swirling, diffusion flame) and the highly turbulent flow conditions resemble the characteristics of industrial combustors. The concentrations of CO2, H2O, CO, CH4, NO, NOx, O2 and H2 as well as local mean temperatures and their fluctuations were recorded at 300 locations at 14 axial planes. The radiation intensity incident on the wall was measured spectrally and time resolved at 11 axial planes within the spectral range of 1.4 to 5.4 μm. For numerically solving the reacting flow field, spectral methods for calculating the radiative heat transfer were coupled to fluid mechanical methods for calculating the reacting flow. The agreement between numerical prediction and measurements for the reacting flow field as well as for the radiative heat transfer is reasonably good. The numerical computations show that radiative transfer is of major importance. The temperature in the hot reaction zone was found to be lowered by approximately 400 K by radiative losses.

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“…The capabilities and performance of the code were demonstrated for gas turbine flow applications by Benz, Wittig, Beeck, and Fottner (1993), Kurreck and Wittig (1994), and Wittig, Bauer, and Noll (1987). Due to the insufficient resolution of the near wall region the standard k-c with wall functions approach was not suitable for heat transfer predictions.…”

Section: Numerical Flowfield and Heat Transfer Computationsmentioning

confidence: 99%

Transonic Film-Cooling Investigations: Effects of Hole Shapes and Orientations

Wittig

Schulz

Gritsch

et al. 1996

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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The emphasis of the present study is to understand the effects of various flowfield and geometrical parameters in the nearfield region of a scaled-up film-cooling hole on a flat test plate. The effect of these different parameters on adiabatic wall effectivenesses, heat transfer coefficients, discharge coefficients and the near-hole velocity field will be addressed. The geometrical parameters of concern include several angles of inclination and rotation of a cylindrical film-cooling hole and two different hole shapes — a fanshaped hole and a laidback fanshaped hole. The fluid dynamic parameters include both the internal and external Mach number as well as the mainstream-to-coolant ratios of total temperature, velocity, mass flux, and momentum flux. In particular, the interaction of a film-cooling jet being injected into a transonic mainstream will be studied. This paper includes a detailed description of the test rig design as well as the measuring techniques. Firstly, tests revealing the operability of the test rig will be discussed. Finally, an outlook of the comprehensive experimental and numerical program will be given.

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Numerical Simulation of Combustor Flows on Parallel Computers: Practical Limitations and Practical Experience

Cited by 8 publications

References 13 publications

Film-Cooling From Holes With Expanded Exits: A Comparison of Computational Results With Experiments

Film-Cooling From Holes With Expanded Exits: A Comparison of Computational Results With Experiments

Validation of Numerical Methods at a Confined Turbulent Natural Gas Diffusion Flame Considering Detailed Radiative Transfer

Transonic Film-Cooling Investigations: Effects of Hole Shapes and Orientations

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