Influence of turbulent fluctuations on radiation heat transfer, NO and soot formation under ECN Spray A conditions

Bolla, Michele; Chishty, Muhammad Aqib; Hawkes, Evatt R.; Chan, Qing Nian; Kook, Sanghoon

doi:10.1016/j.proci.2016.06.173

Cited by 28 publications

(37 citation statements)

References 28 publications

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“…9,10,11 including soot and radiation. 12 Results obtained here will be compared with experimental measurements and with results from earlier modeling studies in the Results and Discussion section.…”

Section: Introductionmentioning

confidence: 84%

“…These results largely confirm what has been shown in earlier modeling studies that focused on turbulence-chemistry interactions in these flames. 9,10,11,12 • In soot modeling, it is essential to account for the influences of unresolved turbulent fluctuations in composition and temperature. Accounting for the spatial and temporal coherence of the fluctuations may be of secondary importance, since the main effects with respect to overall soot levels and soot spatial distributions appear to be captured in URANS/PDF.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Soot and spectral radiation modeling for high-pressure turbulent spray flames

Fernandez

Paul

Sircar

et al. 2018

Combustion and Flame

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Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Soot and spectral radiation modeling for high-pressure turbulent spray flames

Fernandez

Paul

Sircar

et al. 2018

Combustion and Flame

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“…A more rigorous but computationally even more challenging approach is provided by the transported PDF (TPDF) method. The TPDF approach has proven to be particularly effective in accounting for TCI in spray studies using RANS [130][131][132][133][134][135]. Recently, Varna et al [135] showed that the IDT of Spray A is insensitive to TPDF method's internal mixing model, while influence on FLOL was considerable.…”

Section: Overview Of Sub-modelsmentioning

confidence: 99%

“…Recently, there have been several publications on soot and radiation properties of the Spray A flame with different model combinations [134,153,154]. Authors emphasize that further work is needed to improve quantitative performance of emission predictions across wide-ranging conditions.…”

Section: Les Of the Ecn Spray A Casementioning

confidence: 99%

Comparative study on chemical kinetic schemes for dual-fuel combustion of n-dodecane/methane blends

Masouleh

Wehrfritz

Kaario

et al. 2017

Fuel

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“…At the same time, increasing accuracy is being demanded from CFD models for incylinder processes, including quantitatively accurate predictions of efficiency and pollutant emissions. In recent years, sophisticated radiation models that account accurately for the spectral properties of the reacting mixture have become available, and these are being applied with increasing frequency in CFD modeling studies of luminous and nonluminous laboratory flames [8][9][10][11][12] . Recently, detailed investigations of radiative heat transfer under enginerelevant conditions using high-fidelity spectral models have been reported by Fernandez et al [11] for the Engine Combustion Network "Spray A" flame: a high-pressure turbulent spray flame using n-dodecane fuel.…”

Section: Introductionmentioning

confidence: 99%

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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Influence of turbulent fluctuations on radiation heat transfer, NO and soot formation under ECN Spray A conditions

Cited by 28 publications

References 28 publications

Soot and spectral radiation modeling for high-pressure turbulent spray flames

Soot and spectral radiation modeling for high-pressure turbulent spray flames

Comparative study on chemical kinetic schemes for dual-fuel combustion of n-dodecane/methane blends

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

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