Influence of turbulence–radiation interactions in laboratory-scale methane pool fires

Consalvi, Jean-Louis

doi:10.1016/j.ijthermalsci.2012.05.013

Cited by 32 publications

(5 citation statements)

References 54 publications

(58 reference statements)

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“…The present TRI results are qualitatively consistent with earlier studies of laboratory-scale atmospheric-pressure nonluminous [37][38][39][40] , luminous (sooting) [9,10,41,42] and pool-fire [43,44] flames, in that TRI increases both radiative emission and radiative heat loss. However, in contrast to the ~50-100% increase in radiative emission due to TRI in [9] , this study shows only a ~2-4% increase in radiative emission due to TRI.…”

Section: Tablesupporting

confidence: 91%

A detailed modeling study of radiative heat transfer in a heavy-duty diesel engine

Paul

Fernandez

Haworth

et al. 2019

Combustion and Flame

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In recent years, the importance of radiative heat transfer in combustion has been increasingly recognized. Detailed models have become available that accurately represent the complex spectral radiative properties of reacting gas mixtures and soot particles, and new methods have been developed to solve the radiative transfer equation (RTE). At the same time, the trends toward higher operating pressures and higher levels of exhaust-gas recirculation in compression-ignition engines, together with the demand for higher quantitative accuracy from in-cylinder CFD models, has led to renewed interest in radiative transfer in engines. Here an in-depth investigation of radiative heat transfer is performed for a heavy-duty diesel truck engine over a range of operating conditions. Results from 10 different combinations of turbulent combustion models, spectral radiation property models, and RTE solvers are compared to provide insight into the global influences of radiation on energy redistribution in the combustion chamber, heat losses, and engine-out pollutant emissions (NO and soot). Also, the relative importance of the individual contributions of molecular gas versus soot radiation, the spectral model, the RTE solver, and unresolved turbulent fluctuations in composition and temperature (turbulence-radiation interactions-TRI) are investigated. Local instantaneous temperatures change by as much as 100 K with consideration of radiation, but the global influences of radiation on heat losses and engine-out emissions are relatively small (in the 5-10% range). Molecular gas radiation dominates over soot radiation, consideration of spectral properties is essential for accurate predictions of reabsorption, a simple RTE solver (a first-order spherical harmonics-P 1-method) is sufficient for the conditions investigated, and TRI effects are small (less than 10%). While the global influences of radiation are relatively small, it is nevertheless desirable to explicitly account for radiation in in-cylinder CFD. To that end, a simplified CFD radiation model has been proposed, based on the findings reported here.

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Section: Tablesupporting

confidence: 91%

A detailed modeling study of radiative heat transfer in a heavy-duty diesel engine

Paul

Fernandez

Haworth

et al. 2019

Combustion and Flame

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“…Since emission TRIs are the dominant type of TRI in most combustion scenarios, significant research has been dedicated to modeling emission TRIs. One approach to do this is the RANS-based approach, wherein individual correlations arising out of averaging of the emission term, namely κ P E b , are modeled to various degrees of sophistication [23,31,32,[39][40][41][42][43][44][45]. One approach to doing so is to assume PDFs that statistically describe the temperature and concentration fluctuations-an approach that has traditionally been used to address turbulence-chemistry interactions in flames [46,47].…”

Section: Ransmentioning

confidence: 99%

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Mazumder

Roy

2023

Energies

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Modeling thermal radiation in combustion environments can be extremely challenging for two main reasons. First, the radiative transfer equation (RTE), which is the cornerstone of modeling radiation in such environments, is a five-dimensional integro-differential equation. Second, the absorption and scattering coefficients of molecular gases and particulates prevalent in combustion environments oscillate strongly with the wavenumber (or wavelength), i.e., the medium is strongly nongray, requiring the solution of the RTE for a large number of wavenumbers. This article reviews the progress that has been made in this area to date with an emphasis on the work performed over the past three decades. Progress in both deterministic and stochastic (Monte Carlo) solutions of the RTE is reviewed, in addition to the review of the treatment of the spectral properties of gases, soot, and fuel droplets that dominate combustion environments, i.e., spectral or nongray models. The application of the various state-of-the-art nongray models and RTE solution methods to flames (particularly turbulent), fires, combustors, and other combustion systems are summarized along with a critical discussion of the pros and cons of the models and methods. Finally, the challenges that remain in modeling thermal radiation in combustion systems are highlighted and future outlooks are shared.

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“…In addition, the aforementioned RHT has a significant impact on the kinetic and high-temperature sensitive process (e.g NOx and CO formation and destruction) as well as on the conservation of energy through the divergence of the radiative flux ∇ q′′ R = Γ ∇G. The radiation may also have an important role in the production of turbulent kinetic energy [32]. The Finite Rate/Eddy Dissipation Model (FR/EDM) is adopted to describe turbulence-chemistry interaction, where the net production rate for species i due to the reaction r is given by the minimum of the following equations (details can be found in [33]):…”

Section: Numerical Domainmentioning

confidence: 99%

Emission characteristics of turbulent premixed propane/air/carbon dioxide and propane/air/ammonia swirl flames through a rich‐lean combustor

Hemaizia,

Thévenin,

Bentebbiche

2023

Proc Appl Math and Mech

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This study is dedicated to understanding the combustion characteristics of turbulent premixed C3H8‐Air‐CO2 and C3H8‐Air‐NH3 swirl flames in a rich‐lean combustor at atmospheric pressure. In this study, the emission characteristics of both flames were obtained through two‐dimensional numerical simulations based on the RANS approach with Realizable k‐ϵ turbulence model for turbulence closure, and the P1 radiation model for the flame radiation inside the combustor. The turbulence‐chemistry interaction was modeled using the Finite‐Rate Eddy Dissipation Model (FR/EDM) model with a reduced reaction mechanism (Jones‐Lindstedt). The study was conducted for five volumetric fractions of CO2 or NH3, XCO2/NH3 = 0,4%, 8%, 12%, 16%, two swirl numbers (Sn = 0.6 and 1.05), and four equivalence ratios, ϕ = 0.4 (with dilution), 0.5, 0.8, and 1. The results show that the addition of NH3 to C3H8‐Air flames promotes the production of CO, whereas the minimum NOx emission (0.14 ppm) was obtained for a dilution rate of 16% at ϕ = 0.8 and Sn = 0.6 corresponding to an outlet temperature of Tout = 1652 K.

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Influence of turbulence–radiation interactions in laboratory-scale methane pool fires

Cited by 32 publications

References 54 publications

A detailed modeling study of radiative heat transfer in a heavy-duty diesel engine

A detailed modeling study of radiative heat transfer in a heavy-duty diesel engine

Modeling Thermal Radiation in Combustion Environments: Progress and Challenges

Emission characteristics of turbulent premixed propane/air/carbon dioxide and propane/air/ammonia swirl flames through a rich‐lean combustor

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