Numerical simulations of the radiative transfer in a 2D axisymmetric turbulent non-premixed methane–air flame using up-to-date WSGG and gray-gas models

Centeno, Felipe Roman; Silva, Cristiano Vitorino da; Brittes, Rogério

doi:10.1007/s40430-015-0425-2

Cited by 5 publications

(8 citation statements)

References 35 publications

(67 reference statements)

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“…No scattering was considered in this study as no particles were introduced; studies of radiation heat transfer without scattering have previously been done for gaseous fuels and have given relevant results [20]. The default Gray spectral model was used, whereas the implemented WSGG refers to the paper by Centeno et al [37]. In this paper, the authors introduced a four-gray-gases WSGG model with weighting factors for each gray gas derived as a polynomial function of temperature.…”

Section: Numerical Modelsmentioning

confidence: 99%

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Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

2020

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Multi-element thrusters operating with gaseous oxygen (GOX) and methane (GCH4) have been numerically studied and the results were compared to test data from the Technical University of Munich (TUM). A 3D Reynolds Averaged Navier–Stokes Equations (RANS) approach using a 60° sector as a simulation domain was used for the studies. The primary goals were to examine the effect of the turbulent Prandtl number approximations including local algebraic approaches and to study the influence of radiative heat transfer (RHT). Additionally, the dependence of the results on turbulence modeling was studied. Finally, an adiabatic flamelet approach was compared to an Eddy-Dissipation approach by applying an enhanced global reaction scheme. The normalized and absolute pressures, the integral and segment averaged heat flux were taken as an experimental reference. The results of the different modeling approaches were discussed, and the best performing models were chosen. It was found that compared to other discussed approaches, the BaseLine Explicit Algebraic Reynolds Stress Model (BSL EARSM) provided more physical behavior in terms of mixing, and the adiabatic flamelet was more relevant for combustion. The effect of thermal radiation on the wall heat flux (WHF) was high and was strongly affected by spectral models and wall thermal emissivity. The obtained results showed good agreement with the experimental data, having a small underestimation for pressures of around 2.9% and a good representation of the integral wall heat flux.

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Section: Numerical Modelsmentioning

confidence: 99%

“…where b j,i are the polynomial coefficients taken from reference [37]. The absorption coefficients were introduced by the equation:…”

Section: Numerical Modelsmentioning

confidence: 99%

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

2020

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“…No scattering was included in this study as no particles were introduced; the studies of radiation heat transfer without scattering had been conducted before and provided decent results. 39 The absorption coefficients in the implemented WSGG model by Centeno et al 40 are derived from the partial pressures of most radiating species, H 2 O and C O 2 . The radiation transfer equation would have a form 28 :…”

Section: Numerical Setupmentioning

confidence: 99%

“…where p C O 2 and p H 2 O are C O 2 and H 2 O partial pressures respectively, and k p , j is taken from reference. 40…”

Section: Numerical Setupmentioning

confidence: 99%

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Numerical simulation of reacting flow in the combustion chamber and study of the impact of turbulent diffusion coefficients

Strokach

Borovik

Chen

2020

Advances in Mechanical Engineering

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A methodology for combustion modeling with complex mixing and thermodynamic conditions, especially in thrusters, is still under development. The resulting flow and propulsion parameters strongly depend on the models used, especially on the turbulence model as it determines the mixing efficiency. In this paper, the effect of the sigma-type turbulent diffusion coefficients arriving in the diffusion term of the turbulence model is studied. This study was performed using complex modeling, considering the conjugate effect of several physical phenomena such as turbulence, chemical reactions, and radiation heat transfer. To consider the varying turbulent Prandtl, an algebraic model was implemented. An adiabatic steady diffusion Flamelet approach was used to model chemical reactions. The P1 differential model with a WSGG spectral model was used for radiation heat transfer. The gaseous oxygen (GOX) and methane (GCH4) operating thruster developed at the Chair of turbomachinery and Flight propulsion of the Technical University of Munich (TUM) is taken as a test case. The studies use the 3D RANS approach using the 60° sector as the modeling domain. The normalized and absolute pressures, the integral and segment averaged heat flux are compared to numerical results. The wall heat fluxes and pressure distributions show good agreement with the experimental data, while the turbulent diffusion coefficients mostly influence the heat flux.

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Second-order modeling of non-premixed turbulent methane-air combustion

Ershadi

Zargarabadi

2021

J. Cent. South Univ.

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Numerical simulations of the radiative transfer in a 2D axisymmetric turbulent non-premixed methane–air flame using up-to-date WSGG and gray-gas models

Cited by 5 publications

References 35 publications

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

Numerical simulation of reacting flow in the combustion chamber and study of the impact of turbulent diffusion coefficients

Second-order modeling of non-premixed turbulent methane-air combustion

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