This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of Partial Oxidation in an Unburned Mixture on a Flame Stretch under EGR Conditions
Technical Paper
2021-01-1165
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
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) gasoline 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 the behavior of a flame stretch and the extinction limit. The behavior of the flame stretch was simulated using the detailed chemical kinetics simulation with the opposed-flow flame reactor model. In the simulation, the reactants which have various reaction progress variables were examined to simulate the flame stretch and extinction under 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 extends the extinction limit and mitigates a decrease in flame temperature of the stretched flame. The detailed analysis was also conducted from the viewpoint of molecular diffusion and chemical reactions of the partially oxidized reactants. The result reveals that the extension of the extinction limit for the partially oxidized mixture results from the acceleration of the chemical reactions rather than the diffusion effect. The LTO reactions in a pre-flame zone decompose fuel into smaller molecules before entering a reaction zone, and consequently subsequent reactions accelerate in the reaction zone. The result of sensitivity analysis is also discussed.
Authors
Topic
Citation
Yoshimura, K., Ozawa, K., Yamaguchi, K., Sok, R. et al., "Effects of Partial Oxidation in an Unburned Mixture on a Flame Stretch under EGR Conditions," SAE Technical Paper 2021-01-1165, 2021, https://doi.org/10.4271/2021-01-1165.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 |
Also In
References
- Peters , N. Turbulent Combustion 2000 120
- Nakata , K. , et al. Toyota’s New Combustion Technology for High Engine Thermal Efficiency and High Engine Output Performance 37th International Wiener Motor Symposium 2016
- Yoshihara , Y. et al. Development of High Tumble Intake-Port for High Thermal Efficiency Engines SAE Technical Paper 2016-01-0692 2012 https://doi.org/10.4271/2016-01-0692
- Yamada , T. et al. Intake Design for Reduction of Duration of Combustion Honda R&D Technical Review 27 2 2015
- Tanahashi , M. Turbulent Premixed Combustion I -Reference Scales of Turbulence and Premixed Flame Journal of the Combustion Society of Japan 51 158 2009 295 302
- Saito , T. et al. Effect of Turbulence Intensities and Fuel Species in Turbulent Premixed Flames Journal of the Combustion Society of Japan 44 130 2002 243 252
- Yokoo , N. et al. Research of Fuel Components to Enhance Engine Thermal Efficiency Trans. of JSAE 20184173 2018
- Szybist , J.P. et al. What Fuel Properties Enable Higher Thermal Efficiency in Spark-Ignited Engines? Prog. in Energy and Combustion Science 82 2021
- Yamakawa , M. et al. Combustion Technology Development for a High Compression Ratio Gasoline Engine Trans. of JSAE 20124105 2012
- Youso , T. et al. Study on the Relationship between Fuel Characteristics and Auto-Ignition in Gasoline HCCI Engines (First Report) Trans. of JSAE 20094054 2009
- Szybist , J.P. et al. Pressure and Temperature Effects on Fuels with Varying Octane Sensitivity at High Load in SI Engines Combustion and Flame 177 2017 49 66
- https://www.ansys.com/
- Sakai , Y. , et al. 28th Internal Combustion Engine Symposium, 59-20178019 2017
- Sakai , Y. , et al. 29th Internal Combustion Engine Symposium, 34-20183155 2018
- Niioka , T. Analysis of Combustion Phenomenon 2004 2 3
- Sakai , Y. et al. Interpretation of Structure Dependence in Octane Number from Low Temperature Oxidation Mechanism Journal of the Combustion Society of Japan 54 170 2012 221 229
- Iijima , A. Autoignition in Internal Combustion Engines Journal of the Combustion Society of Japan 57 180 2015 95 105