A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies
In order to clarify the potential of internal purification methods on medium speed diesel engines to meet the IMO Tier III nitrogen oxide (NOx) emission regulations, combined 1-D engine working cycle simulation and 3-D CFD simulation were conducted to predict the performance and emissions of the eng...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-05-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/8/5/4118 |
| _version_ | 1811185112258183168 |
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| author | Shuang He Bao-Guo Du Li-Yan Feng Yao Fu Jing-Chen Cui Wu-Qiang Long |
| author_facet | Shuang He Bao-Guo Du Li-Yan Feng Yao Fu Jing-Chen Cui Wu-Qiang Long |
| author_sort | Shuang He |
| collection | DOAJ |
| description | In order to clarify the potential of internal purification methods on medium speed diesel engines to meet the IMO Tier III nitrogen oxide (NOx) emission regulations, combined 1-D engine working cycle simulation and 3-D CFD simulation were conducted to predict the performance and emissions of the engine under different valve close timings, geometric compression ratios, injection timings, and Exhaust Gas Recirculation (EGR) rates. The numerical results show that, as the inlet valve close timing is advanced, NOx is reduced by as much as 27%, but the peak of premixed combustion heat release rate is increased; this can weaken the ability to reduce NOx with the Miller cycle. Moreover, the peak of premixed combustion heat release rate is reduced when the geometric compression ratio is increased to 15.4, and linking with injection timing by delaying 6°CA can further reduce NOx by 55.3% from the baseline. Finally, over 80% NOx reduction can be achieved when the above schemes are combined with over 15% EGR. The NOx and soot can be reduced simultaneously by using moderate Miller cycle combination with moderate EGR, and the results show a large reduction of NOx and moderate reduction of soot. This can be a feasible technical solution to meet Tier III regulations. |
| first_indexed | 2024-04-11T13:23:52Z |
| format | Article |
| id | doaj.art-c0c04e60e06d4d86b6e414ab463f486c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:23:52Z |
| publishDate | 2015-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-c0c04e60e06d4d86b6e414ab463f486c2022-12-22T04:22:07ZengMDPI AGEnergies1996-10732015-05-01854118413710.3390/en8054118en8054118A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning TechnologiesShuang He0Bao-Guo Du1Li-Yan Feng2Yao Fu3Jing-Chen Cui4Wu-Qiang Long5Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaInstitute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaInstitute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaInstitute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaInstitute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaInstitute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, ChinaIn order to clarify the potential of internal purification methods on medium speed diesel engines to meet the IMO Tier III nitrogen oxide (NOx) emission regulations, combined 1-D engine working cycle simulation and 3-D CFD simulation were conducted to predict the performance and emissions of the engine under different valve close timings, geometric compression ratios, injection timings, and Exhaust Gas Recirculation (EGR) rates. The numerical results show that, as the inlet valve close timing is advanced, NOx is reduced by as much as 27%, but the peak of premixed combustion heat release rate is increased; this can weaken the ability to reduce NOx with the Miller cycle. Moreover, the peak of premixed combustion heat release rate is reduced when the geometric compression ratio is increased to 15.4, and linking with injection timing by delaying 6°CA can further reduce NOx by 55.3% from the baseline. Finally, over 80% NOx reduction can be achieved when the above schemes are combined with over 15% EGR. The NOx and soot can be reduced simultaneously by using moderate Miller cycle combination with moderate EGR, and the results show a large reduction of NOx and moderate reduction of soot. This can be a feasible technical solution to meet Tier III regulations.http://www.mdpi.com/1996-1073/8/5/4118medium-speed diesel engineMiller cycleEGRNOx emissionsnumerical simulation |
| spellingShingle | Shuang He Bao-Guo Du Li-Yan Feng Yao Fu Jing-Chen Cui Wu-Qiang Long A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies Energies medium-speed diesel engine Miller cycle EGR NOx emissions numerical simulation |
| title | A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies |
| title_full | A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies |
| title_fullStr | A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies |
| title_full_unstemmed | A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies |
| title_short | A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies |
| title_sort | numerical study on combustion and emission characteristics of a medium speed diesel engine using in cylinder cleaning technologies |
| topic | medium-speed diesel engine Miller cycle EGR NOx emissions numerical simulation |
| url | http://www.mdpi.com/1996-1073/8/5/4118 |
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