Influence of Compression Ratio on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engines Under Different Excess Air Coefficients.
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| Title: | Influence of Compression Ratio on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engines Under Different Excess Air Coefficients. |
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| Authors: | Lou, Diming1 (AUTHOR), Liu, Yixuan1 (AUTHOR), Zhang, Yunhua1 (AUTHOR) zhangyunhua@tongji.edu.cn |
| Source: | Energies (19961073). Apr2025, Vol. 18 Issue 7, p1656. 19p. |
| Subjects: | Lean combustion, Isothermal efficiency, Combustion efficiency, Thermal efficiency, Combustion, Diesel motor combustion |
| Abstract: | Hydrogen internal combustion engines (H2-ICEs) are a promising solution for decarbonizing heavy-duty transportation. This study investigates the effects of compression ratio (CR: 9, 11, 13) and excess air ratio (λ: 1–5) on the performance, emissions, and combustion characteristics of a turbocharged direct-injection H2-ICE under lean-burn conditions. A validated one-dimensional GT-POWER model, calibrated using experimental data (1500 rpm, 0.6 bar intake pressure), was employed to analyze volumetric efficiency (VE), indicated thermal efficiency (ITE), NOx emissions, and combustion stability. Results demonstrate that increasing λ reduces VE and indicated mean effective pressure (IMEP) but enhances ITE, peaking at 41.25% (CR = 13, λ = 2.5). NOx emissions exhibit a non-monotonic trend, reaching 1850 ppm at λ = 1.5 (CR = 13) before declining under leaner conditions. Higher CR extends the lean-burn limit (λ = 5.0 for CR = 13) and advances combustion phasing, though it elevates risks of abnormal combustion. Trade-offs between power, efficiency, and emissions highlight λ = 2.5 as optimal for balancing ITE and NOx control, while λ = 1 maximizes power output. This work provides critical insights into optimizing H2-ICE operation through CR and λ adjustments, supporting the transition toward sustainable heavy-duty transport systems. [ABSTRACT FROM AUTHOR] |
| Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 184440369 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Influence of Compression Ratio on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engines Under Different Excess Air Coefficients. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lou%2C+Diming%22">Lou, Diming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yixuan%22">Liu, Yixuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yunhua%22">Zhang, Yunhua</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhangyunhua@tongji.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Apr2025, Vol. 18 Issue 7, p1656. 19p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lean+combustion%22">Lean combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Isothermal+efficiency%22">Isothermal efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion+efficiency%22">Combustion efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+efficiency%22">Thermal efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion%22">Combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Diesel+motor+combustion%22">Diesel motor combustion</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Hydrogen internal combustion engines (H2-ICEs) are a promising solution for decarbonizing heavy-duty transportation. This study investigates the effects of compression ratio (CR: 9, 11, 13) and excess air ratio (λ: 1–5) on the performance, emissions, and combustion characteristics of a turbocharged direct-injection H2-ICE under lean-burn conditions. A validated one-dimensional GT-POWER model, calibrated using experimental data (1500 rpm, 0.6 bar intake pressure), was employed to analyze volumetric efficiency (VE), indicated thermal efficiency (ITE), NOx emissions, and combustion stability. Results demonstrate that increasing λ reduces VE and indicated mean effective pressure (IMEP) but enhances ITE, peaking at 41.25% (CR = 13, λ = 2.5). NOx emissions exhibit a non-monotonic trend, reaching 1850 ppm at λ = 1.5 (CR = 13) before declining under leaner conditions. Higher CR extends the lean-burn limit (λ = 5.0 for CR = 13) and advances combustion phasing, though it elevates risks of abnormal combustion. Trade-offs between power, efficiency, and emissions highlight λ = 2.5 as optimal for balancing ITE and NOx control, while λ = 1 maximizes power output. This work provides critical insights into optimizing H2-ICE operation through CR and λ adjustments, supporting the transition toward sustainable heavy-duty transport systems. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/en18071656 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 1656 Subjects: – SubjectFull: Lean combustion Type: general – SubjectFull: Isothermal efficiency Type: general – SubjectFull: Combustion efficiency Type: general – SubjectFull: Thermal efficiency Type: general – SubjectFull: Combustion Type: general – SubjectFull: Diesel motor combustion Type: general Titles: – TitleFull: Influence of Compression Ratio on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engines Under Different Excess Air Coefficients. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lou, Diming – PersonEntity: Name: NameFull: Liu, Yixuan – PersonEntity: Name: NameFull: Zhang, Yunhua IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 19961073 Numbering: – Type: volume Value: 18 – Type: issue Value: 7 Titles: – TitleFull: Energies (19961073) Type: main |
| ResultId | 1 |
