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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Main Authors: Seungwoo Kang, Sanguk Lee, Choongsik Bae
Format: Article
Language:English
Published: MDPI AG 2022-03-01
Series:Energies
Subjects:
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.
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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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AT sanguklee effectsofmultistagesplitinjectiononefficiencyandemissionsoflightdutydieselengine
AT choongsikbae effectsofmultistagesplitinjectiononefficiencyandemissionsoflightdutydieselengine