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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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/21/7276 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-09T04:38:27Z |
| format | Article |
| id | doaj.art-ca3f905b16334e1e9d630ea4499d832c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T04:38:27Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-ca3f905b16334e1e9d630ea4499d832c2023-12-03T13:25:44ZengMDPI AGEnergies1996-10732021-11-011421727610.3390/en14217276Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission ControlFabien Tagliante0Tuan M. Nguyen1Lyle M. Pickett2Hyung Sub Sim3Sandia National Laboratories, Livermore, CA 94550, USASandia National Laboratories, Livermore, CA 94550, USASandia National Laboratories, Livermore, CA 94550, USASandia National Laboratories, Livermore, CA 94550, USALarge-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.https://www.mdpi.com/1996-1073/14/21/7276mixed-mode combustiondirect injection gasoline sprayLarge-Eddy simulationsflame propagationsootmixture preparation |
| spellingShingle | Fabien Tagliante Tuan M. Nguyen Lyle M. Pickett Hyung Sub Sim Large-Eddy Simulation of Laser-Ignited Direct Injection Gasoline Spray for Emission Control Energies mixed-mode combustion direct injection gasoline spray Large-Eddy simulations flame propagation soot mixture preparation |
| title | 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_short | 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 |
| topic | mixed-mode combustion direct injection gasoline spray Large-Eddy simulations flame propagation soot mixture preparation |
| url | https://www.mdpi.com/1996-1073/14/21/7276 |
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