Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio
Methanol use in marine engines is associated with challenges pertaining to misfiring and knocking. This study aims at parametrically optimising a marine dual-fuel four stroke engine considering variable compression ratio (VCR) settings and methanol direct injection with 90 % energy fraction. CFD mod...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378382025000323 |
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| author | Panagiotis Karvounis Gerasimos Theotokatos |
| author_facet | Panagiotis Karvounis Gerasimos Theotokatos |
| author_sort | Panagiotis Karvounis |
| collection | DOAJ |
| description | Methanol use in marine engines is associated with challenges pertaining to misfiring and knocking. This study aims at parametrically optimising a marine dual-fuel four stroke engine considering variable compression ratio (VCR) settings and methanol direct injection with 90 % energy fraction. CFD models are developed and validated against experimental data. Parametric runs are employed in 20, 55 and 90 % load, with compression ratio ranging 11–19, to reveal the optimal CR values for each load considering the engine performance and emissions parameters along with constraints on combustion efficiency and stability. The sustainability index is employed to assess the environmental sustainability of the engine under optimal VCR settings compared to FCR. The results reveal that the engine thermal efficiency for CR 19, 16 and 12 at low, medium and high loads respectively increases by 7 %, 2 % at low and medium loads, whereas, decreases by 4 % at the high load. The engine with the proposed VCR settings achieves the compliance with the IMO Tier III limits and increases its sustainability index by 21 % compared to the fixed compression ratio. This study provides insights for the effective use of high methanol energy fractions in marine dual engines, thus contributing to the shipping sector sustainability. |
| format | Article |
| id | doaj-art-13f36e10f1ca466ba3d69a844451ce68 |
| institution | OA Journals |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-13f36e10f1ca466ba3d69a844451ce682025-08-20T02:13:35ZengElsevierFuel Processing Technology0378-38202025-07-0127210820810.1016/j.fuproc.2025.108208Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratioPanagiotis Karvounis0Gerasimos Theotokatos1Corresponding author.; Maritime Safety Research Centre, Department of Naval Architecture, Ocean, and Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, United KingdomMaritime Safety Research Centre, Department of Naval Architecture, Ocean, and Marine Engineering, University of Strathclyde, Glasgow G4 0LZ, United KingdomMethanol use in marine engines is associated with challenges pertaining to misfiring and knocking. This study aims at parametrically optimising a marine dual-fuel four stroke engine considering variable compression ratio (VCR) settings and methanol direct injection with 90 % energy fraction. CFD models are developed and validated against experimental data. Parametric runs are employed in 20, 55 and 90 % load, with compression ratio ranging 11–19, to reveal the optimal CR values for each load considering the engine performance and emissions parameters along with constraints on combustion efficiency and stability. The sustainability index is employed to assess the environmental sustainability of the engine under optimal VCR settings compared to FCR. The results reveal that the engine thermal efficiency for CR 19, 16 and 12 at low, medium and high loads respectively increases by 7 %, 2 % at low and medium loads, whereas, decreases by 4 % at the high load. The engine with the proposed VCR settings achieves the compliance with the IMO Tier III limits and increases its sustainability index by 21 % compared to the fixed compression ratio. This study provides insights for the effective use of high methanol energy fractions in marine dual engines, thus contributing to the shipping sector sustainability.http://www.sciencedirect.com/science/article/pii/S0378382025000323Marine dual fuel enginesVariable compression ratioMethanolNOx emissionsShipping sustainabilityDecarbonisation |
| spellingShingle | Panagiotis Karvounis Gerasimos Theotokatos Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio Fuel Processing Technology Marine dual fuel engines Variable compression ratio Methanol NOx emissions Shipping sustainability Decarbonisation |
| title | Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio |
| title_full | Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio |
| title_fullStr | Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio |
| title_full_unstemmed | Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio |
| title_short | Performance improvement and emissions reduction of methanol fuelled marine dual-fuel engine with variable compression ratio |
| title_sort | performance improvement and emissions reduction of methanol fuelled marine dual fuel engine with variable compression ratio |
| topic | Marine dual fuel engines Variable compression ratio Methanol NOx emissions Shipping sustainability Decarbonisation |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025000323 |
| work_keys_str_mv | AT panagiotiskarvounis performanceimprovementandemissionsreductionofmethanolfuelledmarinedualfuelenginewithvariablecompressionratio AT gerasimostheotokatos performanceimprovementandemissionsreductionofmethanolfuelledmarinedualfuelenginewithvariablecompressionratio |