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Effects of partial oxidation in an unburned mixture on a flame stretch under EGR conditions Waseda University
- Format:
- Book
- Conference/Event
- Author/Creator:
- Yoshimura, Kei, author.
- Conference Name:
- SAE Powertrains, Fuels & Lubricants Digital Summit (2021-09-28 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- The purpose of the present study is to find a way to extend a combustion stability limit for diluted combustion in a spark-ignition (SI) engine which has a high compression ratio. This paper focuses on partial oxidation in an unburned mixture which is observed in the high compression engine, and clarifies the effect of partial oxidation in an unburned mixture on a behavior of a flame stretch and an extinction limit. The behavior of the flame stretch was simulated using the detailed chemical kinetics simulation with an opposed-flow flame reactor model: premixed reactants were inducted from one-side and nitrogen was inducted from the other side. In the simulation, the reactants which have various reaction progress variables were examined to simulate the flame stretch and extinction for the partial oxidation conditions. The mixtures were also diluted by complete combustion products which represent exhaust gas recirculation (EGR). The simulation result shows that low temperature oxidation (LTO) in reactants extend the extinction limit and mitigate a decrease in flame temperature of stretched flame. The detailed analysis was also conducted from the view point of the diffusion and chemical reactions effect of partially oxidized reactants. The result suggests that the extension of the extinction limit results from accelerating chemical reactions rather than the diffusion effect. LTO reactions in a pre-flame zone decompose fuel into smaller molecules before entering a reaction zone, and consequently subsequent reactions accelerates in the reaction zone. The result of sensitivity analysis was also discussed
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-1165
- Access Restriction:
- Restricted for use by site license
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