Parametric study of combustion characteristics in a direct-injection diesel homogeneous charge compression ignition engine with a low-pressure fuel injector.
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| Title: | Parametric study of combustion characteristics in a direct-injection diesel homogeneous charge compression ignition engine with a low-pressure fuel injector. |
|---|---|
| Authors: | Ra, Y.1 yra@erc.wisc.edu, Hruby, E. J.1, Reitz, R. D.1 |
| Source: | International Journal of Engine Research (Professional Engineering Publishing). Jun2005, Vol. 6 Issue 3, p215-230. 16p. 2 Color Photographs, 2 Diagrams, 2 Charts, 9 Graphs. |
| Subjects: | Engines, Diesel motor combustion, Fuel pumps, Emissions (Air pollution), Automobile ignition |
| Abstract: | Homogeneous charge compression ignition (HCCI) combustion is an alternative to current engine combustion systems and is used as a method to reduce emissions. It has the potential nearly to eliminate engine-out NO, emissions while producing diesel-like engine efficiencies, when a pre-mixture of gas-phase fuel and air is burned spontaneously and entirely by an autoignition process. However, when direct injection is used for diesel fuel mixture preparation in engines, the complex in-cylinder flow field and limited mixing times may result in inhomogeneity of the charge. Thus, in order to minimize non-uniformity of the charge, early injection of the fuel is desirable. However, when fuel is injected during the intake or early compression stroke, the use of high-pressure injection is limited by the relatively low in-cylinder gas pressure because of spray impingement on the cylinder walls. Thus, it is also of interest to consider low-pressure injectors as an alternative. In the present paper, the parametric behaviour of the combustion characteristics in an HCCI engine operated with a low-pressure fuel injector were investigated through numerical simulations and engine experiments. Parameters including the start-of-injection (SOI) timing and exhaust gas recirculation were considered, and diesel and n-heptane fuels were used. The results show good agreement of behaviour trends between the experiments and the numerical simulations. With its lower vaporization rates, significant effects of the SOI timing and intake gas temperature were seen for diesel fuel due to the formation of wall films. The modelling results also explained the origin of high-temperature NOx-producing regions due to the effect of the gas density on the spray. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Engine Research (Professional Engineering Publishing) is the property of Sage Publications Inc. 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 18041044 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Parametric study of combustion characteristics in a direct-injection diesel homogeneous charge compression ignition engine with a low-pressure fuel injector. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ra%2C+Y%2E%22">Ra, Y.</searchLink><relatesTo>1</relatesTo><i> yra@erc.wisc.edu</i><br /><searchLink fieldCode="AR" term="%22Hruby%2C+E%2E+J%2E%22">Hruby, E. J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Reitz%2C+R%2E+D%2E%22">Reitz, R. D.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Engine+Research+%28Professional+Engineering+Publishing%29%22">International Journal of Engine Research (Professional Engineering Publishing)</searchLink>. Jun2005, Vol. 6 Issue 3, p215-230. 16p. 2 Color Photographs, 2 Diagrams, 2 Charts, 9 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Engines%22">Engines</searchLink><br /><searchLink fieldCode="DE" term="%22Diesel+motor+combustion%22">Diesel motor combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Fuel+pumps%22">Fuel pumps</searchLink><br /><searchLink fieldCode="DE" term="%22Emissions+%28Air+pollution%29%22">Emissions (Air pollution)</searchLink><br /><searchLink fieldCode="DE" term="%22Automobile+ignition%22">Automobile ignition</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Homogeneous charge compression ignition (HCCI) combustion is an alternative to current engine combustion systems and is used as a method to reduce emissions. It has the potential nearly to eliminate engine-out NO, emissions while producing diesel-like engine efficiencies, when a pre-mixture of gas-phase fuel and air is burned spontaneously and entirely by an autoignition process. However, when direct injection is used for diesel fuel mixture preparation in engines, the complex in-cylinder flow field and limited mixing times may result in inhomogeneity of the charge. Thus, in order to minimize non-uniformity of the charge, early injection of the fuel is desirable. However, when fuel is injected during the intake or early compression stroke, the use of high-pressure injection is limited by the relatively low in-cylinder gas pressure because of spray impingement on the cylinder walls. Thus, it is also of interest to consider low-pressure injectors as an alternative. In the present paper, the parametric behaviour of the combustion characteristics in an HCCI engine operated with a low-pressure fuel injector were investigated through numerical simulations and engine experiments. Parameters including the start-of-injection (SOI) timing and exhaust gas recirculation were considered, and diesel and n-heptane fuels were used. The results show good agreement of behaviour trends between the experiments and the numerical simulations. With its lower vaporization rates, significant effects of the SOI timing and intake gas temperature were seen for diesel fuel due to the formation of wall films. The modelling results also explained the origin of high-temperature NOx-producing regions due to the effect of the gas density on the spray. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Engine Research (Professional Engineering Publishing) is the property of Sage Publications Inc. 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: 10.1243/146808705X7392 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 215 Subjects: – SubjectFull: Engines Type: general – SubjectFull: Diesel motor combustion Type: general – SubjectFull: Fuel pumps Type: general – SubjectFull: Emissions (Air pollution) Type: general – SubjectFull: Automobile ignition Type: general Titles: – TitleFull: Parametric study of combustion characteristics in a direct-injection diesel homogeneous charge compression ignition engine with a low-pressure fuel injector. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ra, Y. – PersonEntity: Name: NameFull: Hruby, E. J. – PersonEntity: Name: NameFull: Reitz, R. D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2005 Type: published Y: 2005 Identifiers: – Type: issn-print Value: 14680874 Numbering: – Type: volume Value: 6 – Type: issue Value: 3 Titles: – TitleFull: International Journal of Engine Research (Professional Engineering Publishing) Type: main |
| ResultId | 1 |
