Analysis of mixture structure and of its influence on combustion in a CAI engine
Homogeneous charge compression ignition combustion mode theoretically relies on a perfectly homogeneous air/fuel mixture simultaneously releasing heat across the whole combustion chamber. However, practical implementation always leads to a staged combustion process that is still significantly quicker than conventional spark ignition or compression ignition combustion modes. The degree of combustion staging is central to the limitation of combustion-induced noise, to cycle efficiency, as well as to combustion stability and completion. The present study numerically explored on the whole operating map the mixture structure at ignition for a specific type of homogeneous charge compression ignition combustion, namely the controlled auto-ignition combustion mode attained through burnt gas trapping with negative valve overlap. The analysis of the complete controlled auto-ignition operating map outlined the similarity of mixture structure for any operating condition and the mixture/chemistry interactions depending on the end-of-compression temperature domain. Temperature stratification appeared as the key input defining combustion-induced noise and combustion stability but mean in-cylinder temperature and dilution combine with temperature stratification to define operating map limitations.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/14680874
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Supplemental Notes:
- © IMechE 2017.
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Authors:
- Knop, Vincent
- Publication Date: 2018-4
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 393-410
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Serial:
- International Journal of Engine Research
- Volume: 19
- Issue Number: 4
- Publisher: Sage Publications, Incorporated
- ISSN: 1468-0874
- EISSN: 20413149
Subject/Index Terms
- TRT Terms: Combustion; Compression ignition engines; Engine efficiency; Fluid dynamics; Fuel air mixtures; Ignition; Numerical analysis; Temperature
- Uncontrolled Terms: Homogeneous charge compression ignition
- Subject Areas: Energy; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01713915
- Record Type: Publication
- Files: TRIS
- Created Date: Aug 16 2019 3:51PM