Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine
The efficiency of light-duty diesel engines should be improved for further emissions regulation. Multi-stage split injection with five injection events was investigated for improvement in efficiency at low-load conditions. The injection timing and quantity were adjusted to achieve a smooth in-cylind...
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Format: | Article |
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MDPI AG
2022-03-01
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Series: | Energies |
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Online Access: | https://www.mdpi.com/1996-1073/15/6/2219 |
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author | Seungwoo Kang Sanguk Lee Choongsik Bae |
author_facet | Seungwoo Kang Sanguk Lee Choongsik Bae |
author_sort | Seungwoo Kang |
collection | DOAJ |
description | The efficiency of light-duty diesel engines should be improved for further emissions regulation. Multi-stage split injection with five injection events was investigated for improvement in efficiency at low-load conditions. The injection timing and quantity were adjusted to achieve a smooth in-cylinder pressure rise and continuous heat release. The multi-stage split injection was compared to injection strategies involving two-pilot and single-main injections. A 0.5 L single-cylinder diesel engine experiment was conducted under low-load conditions. Two multi-stage split injection processes with different combustion phases were developed. The multi-stage split injections yielded a smooth in-cylinder pressure trace and a lower peak heat release rate than the two-pilot injection process. The combustion duration was shorter for multi-stage split injection with an advanced combustion phase, and the fuel consumption was reduced by 1.78% with lower heat transfer, exhaust heat, and combustion loss. The multi-stage split injection flame penetration was shorter than the two-pilot injections. The shorter flame penetration and lower tip velocity reduced the heat transfer to the combustion chamber. The PM emissions were also reduced by 30% under the same NOx emissions, because increased PM oxidation and divided fuel injection prevented flame diffusion and improved air utilization. |
first_indexed | 2024-03-09T13:43:10Z |
format | Article |
id | doaj.art-50b93fa438f84bc38fc876c94928ec9f |
institution | Directory Open Access Journal |
issn | 1996-1073 |
language | English |
last_indexed | 2024-03-09T13:43:10Z |
publishDate | 2022-03-01 |
publisher | MDPI AG |
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series | Energies |
spelling | doaj.art-50b93fa438f84bc38fc876c94928ec9f2023-11-30T21:03:44ZengMDPI AGEnergies1996-10732022-03-01156221910.3390/en15062219Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel EngineSeungwoo Kang0Sanguk Lee1Choongsik Bae2Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, KoreaDepartment of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, KoreaDepartment of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, KoreaThe efficiency of light-duty diesel engines should be improved for further emissions regulation. Multi-stage split injection with five injection events was investigated for improvement in efficiency at low-load conditions. The injection timing and quantity were adjusted to achieve a smooth in-cylinder pressure rise and continuous heat release. The multi-stage split injection was compared to injection strategies involving two-pilot and single-main injections. A 0.5 L single-cylinder diesel engine experiment was conducted under low-load conditions. Two multi-stage split injection processes with different combustion phases were developed. The multi-stage split injections yielded a smooth in-cylinder pressure trace and a lower peak heat release rate than the two-pilot injection process. The combustion duration was shorter for multi-stage split injection with an advanced combustion phase, and the fuel consumption was reduced by 1.78% with lower heat transfer, exhaust heat, and combustion loss. The multi-stage split injection flame penetration was shorter than the two-pilot injections. The shorter flame penetration and lower tip velocity reduced the heat transfer to the combustion chamber. The PM emissions were also reduced by 30% under the same NOx emissions, because increased PM oxidation and divided fuel injection prevented flame diffusion and improved air utilization.https://www.mdpi.com/1996-1073/15/6/2219injection strategysplit injectionflame visualizationengine efficiencyengine emissions |
spellingShingle | Seungwoo Kang Sanguk Lee Choongsik Bae Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine Energies injection strategy split injection flame visualization engine efficiency engine emissions |
title | Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine |
title_full | Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine |
title_fullStr | Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine |
title_full_unstemmed | Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine |
title_short | Effects of Multi-Stage Split Injection on Efficiency and Emissions of Light-Duty Diesel Engine |
title_sort | effects of multi stage split injection on efficiency and emissions of light duty diesel engine |
topic | injection strategy split injection flame visualization engine efficiency engine emissions |
url | https://www.mdpi.com/1996-1073/15/6/2219 |
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