Extended Coherent Flame Model applied to an optical single-cylinder engine fueled with ethanol

Krieger Filho, Guenther C.; Silva, Filipi M. Fernandes; Pacífico, Antônio L.; Sacomano Filho, Fernando L.; Zabeu, Clayton B.; Nigro, Francisco B.; França, Oswaldo M.; Penaranda, Alexander; Lacava, Pedro T.

doi:10.1016/j.applthermaleng.2023.121399

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…A turbulent premixed combustion regime can be specified using different properties such as chemical timescale, integral length scale, and turbulence intensity. Due to the assumption that in many combustion devices (e.g., reciprocating internal combustion engines) the chemical timescales are much smaller than the turbulent ones, an additional combustion concept can be applied: the CFM 14. The CFM is applicable to both premixed and non‐premixed conditions on the basis of a laminar flamelet concept, the velocity and thickness of which are mean values, integrated along the flame front, and only dependent on the pressure, the temperature, and the richness in fresh gases.…”

Section: Turbulence Combustion Modelsmentioning

confidence: 99%

Numerical Investigation of Different Combustion Models for Dual‐Fuel Engine Combustion Processes

Liu,

Wu,

Wang

et al. 2023

Chem Eng & Technol

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The combustion process of a dual‐fuel engine was calculated by characteristic timescale model (CTM), eddy breakup model (EBM), and coherent flamelet model (CFM) to verify the accuracy of the combustion models. The results show that the peak pressure calculated by EBM is 2.78 % higher than the experimental value, and the peak pressure calculated by CFM is closest to the experimental value. The EBM is the most accurate for CO2 emissions. The deviation of CO emissions from the experimental values calculated by CTM is the smallest (< 1 %). The NOx emission calculated by CTM is good agreement with the experimental value at low speed, and EBM is in best agreement with the experimental value at high speed. The hydrocarbon emission calculated by CFM is the most accurate, with a deviation of less than 0.6 %.

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Section: Turbulence Combustion Modelsmentioning

confidence: 99%

Numerical Investigation of Different Combustion Models for Dual‐Fuel Engine Combustion Processes

Liu,

Wu,

Wang

et al. 2023

Chem Eng & Technol

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Investigations of the differential diffusion modeling for hydrophilic fuel vapor in propagating spray flames

Sacomano Filho,

Freire de Carvalho,

Carvalho Santos

et al. 2025

Fuel

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Effects of pre-chamber flow-field on combustion stability in a spark-ignition engine using large-eddy simulations

Novella,

Pastor,

Gomez-Soriano

et al. 2023

Physics of Fluids

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Significant efforts are under way to develop innovative ignition systems for spark-ignition engines used in transportation. Within this context, passive pre-chamber technology has emerged as a promising alternative for passenger cars. However, several uncertainties remain regarding the operation of this concept at low engine loads and speeds, as well as the impact of specific design features on combustion stability. Previous investigations have indicated that the tangential angle of the pre-chamber holes can play a vital role in stabilizing the combustion process. Nonetheless, the underlying thermo-physical phenomena responsible for these results have not yet been thoroughly studied. To address these knowledge gaps, this paper presents a numerical study using a computational fluid dynamics model that has been validated with experimental results. An alternative modeling methodology was developed to conduct multi-cycle large-eddy simulations and investigate two different pre-chamber configurations, one with tangential holes and the other with radial holes. The results revealed an intriguing correlation between the combustion stability and the spatial distribution of the flame inside the pre-chamber. The cycle-to-cycle dispersion of pre-chamber flow variables was significantly higher when using radial holes compared to tangential holes, potentially explaining the unstable behavior of the former design. Additionally, the undesirable flow-field of the radial-hole pre-chamber caused the flame to evolve asymmetrically, resulting in substantial variations in the ejected jets. This asymmetry can significantly affect the morphology of the main chamber ignition in each cycle.

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Extended Coherent Flame Model applied to an optical single-cylinder engine fueled with ethanol

Cited by 3 publications

References 33 publications

Numerical Investigation of Different Combustion Models for Dual‐Fuel Engine Combustion Processes

Numerical Investigation of Different Combustion Models for Dual‐Fuel Engine Combustion Processes

Investigations of the differential diffusion modeling for hydrophilic fuel vapor in propagating spray flames

Effects of pre-chamber flow-field on combustion stability in a spark-ignition engine using large-eddy simulations

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