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

Fernandez, Sebastian Ferreyro; Paul, Chandan; Sircar, Arpan; İmren, Abdurrahman; Haworth, Daniel C.; Roy, S.C.; Modest, Michael F.

doi:10.1016/j.combustflame.2017.12.016

Cited by 49 publications

(42 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, the decrease in NOx due to TRI is approximately 1%, which is significantly lower compared to the reported values (a factor 2-to -5 times lower) in [40,42] . Also, recent studies [11,12] of ECN "Spray A" (liquid ndodecane fuel) flame concluded that with TRI, radiative emission increases marginally (by less than 10%), and that is consistent with 1, at 27.5 o aTDC for full-load EGR operating condition. A vertical blue line is shown at R = 1 for demarcation.…”

Section: Tablementioning

confidence: 62%

“…For secondary breakup, the Reitz-Diwakar model [28,29] is used. These models are not considered to be truly predictive; rather, the models are tuned to give reasonable liquid penetration rates under engine-relevant conditions [11] . Values of the spray model constants are summarized in Table 2 .…”

Section: Physical Processes Other Than Radiationmentioning

confidence: 99%

“…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%

“…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. This study included investigations of the influence of unresolved turbulent fluctuations in composition and temperature on radiative emission and reabsorption (turbulence-radiation interactions -TRI), which were found to be relatively small (approximately 10%).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Paul

Fernandez

Haworth

et al. 2019

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Tablementioning

confidence: 62%

Section: Physical Processes Other Than Radiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Paul

Fernandez

Haworth

et al. 2019

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Jurić

Coelho

Priesching

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary It is well‐known that the pollutant formation processes and temperature distribution in various combustion systems that operate at high temperatures are influenced by radiation heat transport. Detailed modeling of radiation transport in internal combustion (IC) engines demands additional computational power, and hence the calculation of radiation phenomenon is not commonly applied in IC engines. At the same time, current operating conditions in IC engines consider high temperatures and recirculation of exhaust gases that enhance gas radiation. Therefore, the application of radiation models is needed to increase the correctness of radiative absorption, combustion characteristics, and the formation of pollutant emissions. In this paper, the implementation and validation of the spectral line‐based weighted‐sum‐of‐gray‐gases (SLW) model for calculating soot and gas radiation are performed. The SLW model is implemented in the computational fluid dynamics code AVL FIRE by programable user routines. The radiative transfer equation was calculated employing the finite volume method applicable for multiprocessing, moving meshes, and a mesh rezone procedure required for IC engine modeling. The validation of the SLW model is performed on one‐dimensional geometric cases that include analytical results of radiation intensity, for which agreement within 10% of the relative error was achieved. Additionally, the SLW model is applied to compression ignition engine simulations, where the obtained results are compared with the measured pressure and concentrations of NO and soot emissions. The calculated heat losses through the wall boundary layer were around 12% of the total fuel energy, approximately 9.5% of the total fuel energy was lost due to the convective flow. 7%–8% of convection heat loss was due to the higher emission than absorption of participating CO2 and H2O gasses, and the rest are net soot losses. For the observed operating cases, the computational time is increased nearly double for SLW model than in the simulation without radiation. Finally, the results calculated using SLW indicate an improved agreement with the experimental mean pressure, temperature, soot, and NO concentrations compared to simulations without radiation.

show abstract

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

Cited by 49 publications

References 41 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

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

Implementation of the spectral line‐based weighted‐sum‐of‐gray‐gases model in the finite volume method for radiation modeling in internal combustion engines

Contact Info

Product

Resources

About