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Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions

Gasoline and methanol are highly recommended for low temperature combustion (LTC) engines due to their high research octane number. However, engines fuelled with these fuels suffer from high unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions at low loads, which can be improved by controll...

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Main Authors: Xu, Leilei, Treacy, Mark, Zhang, Yan, Amir, Aziz, Tunér, Martin, Bai, Xue Song
Format: Article
Language:English
Published: Elsevier Ltd 2022
Subjects:
T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
Online Access:http://umpir.ump.edu.my/id/eprint/42632/1/Comparison%20of%20efficiency%20and%20emission%20characteristics%20in%20a%20direct-injection.pdf
http://umpir.ump.edu.my/id/eprint/42632/
https://doi.org/10.1016/j.apenergy.2022.118714
https://doi.org/10.1016/j.apenergy.2022.118714
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spelling my.ump.umpir.426322024-10-03T04:24:18Z http://umpir.ump.edu.my/id/eprint/42632/ Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions Xu, Leilei Treacy, Mark Zhang, Yan Amir, Aziz Tunér, Martin Bai, Xue Song T Technology (General) TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics Gasoline and methanol are highly recommended for low temperature combustion (LTC) engines due to their high research octane number. However, engines fuelled with these fuels suffer from high unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions at low loads, which can be improved by controlling the level of mixture stratification. This paper reports on the experimental and numerical comparison of the emission characteristics and engine performance of methanol and iso-octane in a heavy-duty direct-injection compression ignition engine operating in HCCI and PPC regimes. Overall, methanol requires a higher intake temperature, compared with iso-octane, to counter the high heat of vaporization. The onset of ignition is from the relatively fuel-lean regions resulting in lower CO emissions. This is due to the methanol ignition delay times being less sensitive to the fuel/air mixture and the larger temperature gradient of the equivalence ratio. Methanol achieves lower charge stratification because of its low stoichiometric A/F ratio, which extends the SOI window with ultra-low NOx emissions. However, methanol suffers from higher UHC emissions in the HCCI regime due to fuel trapped in the crevice region. Three cases include HCCI, PPC with low and high mixture stratification were detailed investigated. Of these cases, PPC with low mixture stratification case shows the highest engine thermal efficiency and the lowest emissions. Methanol has more advantages operating in the PPC regime in the aspect of emissions. Elsevier Ltd 2022-04-15 Article PeerReviewed pdf en cc_by_4 http://umpir.ump.edu.my/id/eprint/42632/1/Comparison%20of%20efficiency%20and%20emission%20characteristics%20in%20a%20direct-injection.pdf Xu, Leilei and Treacy, Mark and Zhang, Yan and Amir, Aziz and Tunér, Martin and Bai, Xue Song (2022) Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions. Applied Energy, 312 (118714). pp. 1-14. ISSN 0306-2619. (Published) https://doi.org/10.1016/j.apenergy.2022.118714 https://doi.org/10.1016/j.apenergy.2022.118714
institution Universiti Malaysia Pahang Al-Sultan Abdullah
building UMPSA Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang Al-Sultan Abdullah
content_source UMPSA Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
spellingShingle T Technology (General)
TA Engineering (General). Civil engineering (General)
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
Xu, Leilei
Treacy, Mark
Zhang, Yan
Amir, Aziz
Tunér, Martin
Bai, Xue Song
Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
description Gasoline and methanol are highly recommended for low temperature combustion (LTC) engines due to their high research octane number. However, engines fuelled with these fuels suffer from high unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions at low loads, which can be improved by controlling the level of mixture stratification. This paper reports on the experimental and numerical comparison of the emission characteristics and engine performance of methanol and iso-octane in a heavy-duty direct-injection compression ignition engine operating in HCCI and PPC regimes. Overall, methanol requires a higher intake temperature, compared with iso-octane, to counter the high heat of vaporization. The onset of ignition is from the relatively fuel-lean regions resulting in lower CO emissions. This is due to the methanol ignition delay times being less sensitive to the fuel/air mixture and the larger temperature gradient of the equivalence ratio. Methanol achieves lower charge stratification because of its low stoichiometric A/F ratio, which extends the SOI window with ultra-low NOx emissions. However, methanol suffers from higher UHC emissions in the HCCI regime due to fuel trapped in the crevice region. Three cases include HCCI, PPC with low and high mixture stratification were detailed investigated. Of these cases, PPC with low mixture stratification case shows the highest engine thermal efficiency and the lowest emissions. Methanol has more advantages operating in the PPC regime in the aspect of emissions.
format Article
author Xu, Leilei
Treacy, Mark
Zhang, Yan
Amir, Aziz
Tunér, Martin
Bai, Xue Song
author_facet Xu, Leilei
Treacy, Mark
Zhang, Yan
Amir, Aziz
Tunér, Martin
Bai, Xue Song
author_sort Xu, Leilei
title Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
title_short Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
title_full Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
title_fullStr Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
title_full_unstemmed Comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
title_sort comparison of efficiency and emission characteristics in a direct-injection compression ignition engine fuelled with iso-octane and methanol under low temperature combustion conditions
publisher Elsevier Ltd
publishDate 2022
url http://umpir.ump.edu.my/id/eprint/42632/1/Comparison%20of%20efficiency%20and%20emission%20characteristics%20in%20a%20direct-injection.pdf
http://umpir.ump.edu.my/id/eprint/42632/
https://doi.org/10.1016/j.apenergy.2022.118714
https://doi.org/10.1016/j.apenergy.2022.118714
_version_ 1822924694211264512
score 13.232389

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