Coupled large eddy simulations of turbulent combustion and radiative heat transfer

Santos, Rogério Gonçalves dos; Lecanu, M.; Ducruix, Sébastien; Gicquel, Olivier; Iacona, Estelle; Veynante, Denis

doi:10.1016/j.combustflame.2007.10.004

Cited by 47 publications

(18 citation statements)

References 32 publications

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“…Most LES of combustion systems have been carried out without taking radiative transfer into account. Among those that have considered radiative transfer, the effect of SGS is generally ignored (see, e.g., [76][77][78][79][80][81]). …”

Section: Large Eddy Simulationmentioning

confidence: 99%

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Turbulence Radiation Interaction: From Theory to Application in Numerical Simulations

Coelho

2010

2010 14th International Heat Transfer Conference, Volume 8

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Theoretical analysis and experimental investigations have shown that the mean heat fluxes in turbulent gaseous flows are influenced not only by the mean scalar fields (temperature and molar fraction of the species), but also by the scalar fluctuations. It is widely recognized that the increase of radiative fluxes in comparison with laminar flows may exceed 100%. This interaction between turbulence and radiation is mainly due to the non-linearity between radiative emission and temperature. It is particularly important in reactive flows, since temperature fluctuations are typically higher in these flows than in non-reactive ones.In this article, a survey of the theory concerning turbulence-radiation interaction (TRI) is presented, along with applications in numerical simulations. We firstly present experimental and theoretical fundamentals on TRI. Then, direct numerical simulation and stochastic methods are addressed. Although they provide reliable information on TRI, they are too computationally demanding for practical applications. We will then focus on methods based on the solution of the time-averaged form of the conservation equations. Although many different approaches are available, we will concentrate on two methods. One is based on the solution of the time-averaged form of the radiative transfer equation using the optically thin fluctuation approximation, and a combustion model based on a prescribed probability density function (pdf) approach. The second one is based on the photon Monte Carlo method for radiative transfer calculations in media represented by discrete particle fields, and a combustion model based on the Monte Carlo solution of the transport equation for the joint pdf of scalars. Finally, the role of TRI in large eddy simulation is discussed, and the main consequences of TRI in combustion systems are summarized.

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Section: Large Eddy Simulationmentioning

confidence: 99%

“…The LES without SGS of thermal radiation means that the temperature and species concentration fields determined by DNS are filtered and taken as input to the solution of the filtered RTE. Then, the filtered RTE is solved neglecting the SGS terms, as in [76][77][78][79][80][81].…”

Section: Large Eddy Simulationmentioning

confidence: 99%

Turbulence Radiation Interaction: From Theory to Application in Numerical Simulations

Coelho

2010

2010 14th International Heat Transfer Conference, Volume 8

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“…Such a combination of LES and conjugate heat transfer (CHT) has already been applied to several combustion applications [18][19][20]. When radiative energy transfer must be accounted for, the LES code is coupled to a solver of the radiative transfer equation [21][22][23]. The LES-CHT combination can then be enriched with a radiation solver to yield a comprehensive multiphysics approach to determine radiative, convective and conductive heat transfers at the wall as in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Applications to confined combustor with opaque boundaries as in [27] require providing the wall emissivity which can be quite uncertain depending on the type and state of the material. To the best of our knowledge, only a couple of studies from French research groups have investigated combustors enclosed with viewing windows [22,23,25,28]. The windows properties were either not detailed or a fixed averaged emissivity was specified [25,28].…”

Section: Introductionmentioning

confidence: 99%

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows

Rodrigues

Gicquel

Darabiha

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Many laboratory-scale combustors are equipped with viewing windows to allow for characterization of the reactive flow. Additionally, pressure housing is used in this configuration to study confined pressurized flames. Since the flame characteristics are influenced by heat losses, the prediction of wall temperature fields becomes increasingly necessary to account for conjugate heat transfer (CHT) in simulations of reactive flows. For configurations similar to this one, the pressure housing makes the use of such computations difficult in the whole system. It is, therefore, more appropriate to model the external heat transfer beyond the first set of quartz windows. The present study deals with the derivation of such a model, which accounts for convective heat transfer from quartz windows external face cooling system, free convection on the quartz windows 2, quartz windows radiative properties, radiative transfer inside the pressure housing, and heat conduction through the quartz window. The presence of semi-transparent viewing windows demands additional care in describing its effects in combustor heat transfers. Because this presence is not an issue in industrial-scale combustors with opaque enclosures, it remains hitherto unaddressed in laboratory-scale combustors. After validating the model for the selected setup, the sensitivity of several modeling choices is computed. This enables a simpler expression of the external heat transfer model that can be easily implemented in coupled simulations.

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“…Such a combination of LES and conjugate heat transfer (CHT) has already been applied to several combustion applications [17][18][19]. When radiative energy transfer must be accounted for, the LES code is coupled to a solver of the radiative transfer equation [20][21][22]. The LES-CHT combination can then be enriched with a radiation solver to yield a comprehensive multiphysics approach to determine radiative, convective and conductive heat transfers at the wall as in Refs.…”

Section: Introductionmentioning

confidence: 99%

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor Inside a Pressure-Housing Environment

Rodrigues¹,

Gicquel²,

Darabiha³

et al. 2018

Volume 5C: Heat Transfer

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Many laboratory-scale combustors are equipped with viewing windows to allow for characterization of the reactive flow. Additionally, pressure housing is used in this configuration to study confined pressurized flames. Since the flame characteristics are influenced by heat losses, the prediction of wall temperature fields becomes increasingly necessary to account for conjugate heat transfer in simulations of reactive flows. For configurations similar to this one, the pressure housing makes the use of such computations difficult in the whole system. It is therefore more appropriate to model the external heat transfer beyond the first set of quartz windows. The present study deals with the derivation of such a model which accounts for convective heat transfer from quartz windows external face cooling system, free convection on the quartz windows 2, quartz windows radiative properties, radiative transfer inside the pressure housing and heat conduction through the quartz window. The presence of semi-transparent viewing windows demands additional care in describing its effects in combustor heat transfers. Because this presence is not an issue in industrial-scale combustors with opaque enclosures, it remains hitherto unaddressed in laboratory-scale combustors. After validating the model for the selected setup, the sensitivity of several modeling choices is computed. This enables a simpler expression of the external heat transfer model that can be easily implemented in coupled simulations.

show abstract

Coupled large eddy simulations of turbulent combustion and radiative heat transfer

Cited by 47 publications

References 32 publications

Turbulence Radiation Interaction: From Theory to Application in Numerical Simulations

Turbulence Radiation Interaction: From Theory to Application in Numerical Simulations

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor Inside a Pressure-Housing Environment

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