Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control

Large-Eddy Simulations (LES) of a gasoline spray, where the mixture was ignited rapidly during or after injection, were performed in comparison to a previous experimental study with quantitative flame motion and soot formation data [SAE 2020-01-0291] and an accompanying Reynolds-Averaged Navier–Stok...

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Autores principales:	Fabien Tagliante, Tuan M. Nguyen, Lyle M. Pickett, Hyung Sub Sim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	mixed-mode combustion direct injection gasoline spray Large-Eddy simulations flame propagation soot mixture preparation Technology T
Acceso en línea:	https://doaj.org/article/ca3f905b16334e1e9d630ea4499d832c
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spelling	oai:doaj.org-article:ca3f905b16334e1e9d630ea4499d832c2021-11-11T16:01:33ZLarge-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control10.3390/en142172761996-1073https://doaj.org/article/ca3f905b16334e1e9d630ea4499d832c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7276https://doaj.org/toc/1996-1073Large-Eddy Simulations (LES) of a gasoline spray, where the mixture was ignited rapidly during or after injection, were performed in comparison to a previous experimental study with quantitative flame motion and soot formation data [SAE 2020-01-0291] and an accompanying Reynolds-Averaged Navier–Stokes (RANS) simulation at the same conditions. The present study reveals major shortcomings in common RANS combustion modeling practices that are significantly improved using LES at the conditions of the study, specifically for the phenomenon of rapid ignition in the highly turbulent, stratified mixture. At different ignition timings, benchmarks for the study include spray mixing and evaporation, flame propagation after ignition, and soot formation in rich mixtures. A comparison of the simulations and the experiments showed that the LES with Dynamic Structure turbulence were able to capture correctly the liquid penetration length, and to some extent, spray collapse demonstrated in the experiments. For early and intermediate ignition timings, the LES showed excellent agreement to the measurements in terms of flame structure, extent of flame penetration, and heat-release rate. However, RANS simulations (employing the common G-equation or well-stirred reactor) showed much too rapid flame spread and heat release, with connections to the predicted turbulent kinetic energy. With confidence in the LES for predicted mixture and flame motion, the predicted soot formation/oxidation was also compared to the experiments. The soot location was well captured in the LES, but the soot mass was largely underestimated using the empirical Hiroyasu model. An analysis of the predicted fuel–air mixture was used to explain different flame propagation speeds and soot production tendencies when varying ignition timing.Fabien TaglianteTuan M. NguyenLyle M. PickettHyung Sub SimMDPI AGarticlemixed-mode combustiondirect injection gasoline sprayLarge-Eddy simulationsflame propagationsootmixture preparationTechnologyTENEnergies, Vol 14, Iss 7276, p 7276 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mixed-mode combustion direct injection gasoline spray Large-Eddy simulations flame propagation soot mixture preparation Technology T
spellingShingle	mixed-mode combustion direct injection gasoline spray Large-Eddy simulations flame propagation soot mixture preparation Technology T Fabien Tagliante Tuan M. Nguyen Lyle M. Pickett Hyung Sub Sim Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
description	Large-Eddy Simulations (LES) of a gasoline spray, where the mixture was ignited rapidly during or after injection, were performed in comparison to a previous experimental study with quantitative flame motion and soot formation data [SAE 2020-01-0291] and an accompanying Reynolds-Averaged Navier–Stokes (RANS) simulation at the same conditions. The present study reveals major shortcomings in common RANS combustion modeling practices that are significantly improved using LES at the conditions of the study, specifically for the phenomenon of rapid ignition in the highly turbulent, stratified mixture. At different ignition timings, benchmarks for the study include spray mixing and evaporation, flame propagation after ignition, and soot formation in rich mixtures. A comparison of the simulations and the experiments showed that the LES with Dynamic Structure turbulence were able to capture correctly the liquid penetration length, and to some extent, spray collapse demonstrated in the experiments. For early and intermediate ignition timings, the LES showed excellent agreement to the measurements in terms of flame structure, extent of flame penetration, and heat-release rate. However, RANS simulations (employing the common G-equation or well-stirred reactor) showed much too rapid flame spread and heat release, with connections to the predicted turbulent kinetic energy. With confidence in the LES for predicted mixture and flame motion, the predicted soot formation/oxidation was also compared to the experiments. The soot location was well captured in the LES, but the soot mass was largely underestimated using the empirical Hiroyasu model. An analysis of the predicted fuel–air mixture was used to explain different flame propagation speeds and soot production tendencies when varying ignition timing.
format	article
author	Fabien Tagliante Tuan M. Nguyen Lyle M. Pickett Hyung Sub Sim
author_facet	Fabien Tagliante Tuan M. Nguyen Lyle M. Pickett Hyung Sub Sim
author_sort	Fabien Tagliante
title	Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
title_short	Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
title_full	Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
title_fullStr	Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
title_full_unstemmed	Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control
title_sort	large-eddy simulation of laser-ignited direct injection gasoline spray for emission control
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ca3f905b16334e1e9d630ea4499d832c
work_keys_str_mv	AT fabientagliante largeeddysimulationoflaserigniteddirectinjectiongasolinesprayforemissioncontrol AT tuanmnguyen largeeddysimulationoflaserigniteddirectinjectiongasolinesprayforemissioncontrol AT lylempickett largeeddysimulationoflaserigniteddirectinjectiongasolinesprayforemissioncontrol AT hyungsubsim largeeddysimulationoflaserigniteddirectinjectiongasolinesprayforemissioncontrol
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Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control

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