This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation of Flame Detachment Effect during Early Flame Development in a Swirl Flow Field
Technical Paper
2021-01-0482
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
Lean burn is regarded as one of the most effective ways to improve fuel efficiency for spark ignition engines. However, the excessive air dilution deteriorates combustion stability, limiting the degree of engine operational dilution. The intensified flow field is therefore introduced into the cylinder to mitigate the decline of the burning velocity caused by the leaned-out fuel-air mixture. In a moderate flow field, flame kernels are formed near the hot spark plasma during discharge and stick to the spark gap even after the end of discharge; the flame front then propagates outward and evolves into self-sustained flame. Flame attaching to the spark gap is a common phenomenon in the early combustion stage and has been reported to be beneficial for flame inception in the literature. However, it is also observed that the formed flame kernels sometimes are blown away from the spark gap by the strong flow motion, and the detached flame kernel gradually develops to self-sustained flame without touching the spark gap. The flame detachment phenomenon has been studied in some literature. Nevertheless, what causes flame kernel detaching from the spark gap and how this phenomenon affects the early combustion process are still less understood.
In this paper, an investigation of the flame detachment phenomenon during early combustion is carried out in a constant volume swirl chamber with optical access. The impacts of various parameters on flame detachment are studied, including gas composition, discharge duration, and discharge current amplitude. Electric waveforms during discharge are acquired to characterize the discharge process; shadowgraph images are used to depict the flame detachment phenomenon under each experimental condition.
Results have shown that flame kernel detachment is mostly affected by discharge duration and flow speed, while less impacted by discharge current amplitude and gas composition. With the same amount of discharge energy delivered to the spark gap, a longer flame attachment duration does not necessarily always have a positive impact on combustion.
Recommended Content
Authors
Topic
Citation
Zhu, H., Wang, L., Yang, Z., Liang, L. et al., "Investigation of Flame Detachment Effect during Early Flame Development in a Swirl Flow Field," SAE Technical Paper 2021-01-0482, 2021, https://doi.org/10.4271/2021-01-0482.Also In
References
- Metz , B.
- Exxon Mobile Corporation 2019
- Yu , X. , Sandhu , N.S. , Yang , Z. , and Zheng , M. Suitability of Energy Sources for Automotive Application - A Review Applied Energy 271 115169 2020 10.1016/j.apenergy.2020.115169
- https://afdc.energy.gov/vehicles/natural_gas.html st
- Reitz , R.D. , Ogawa , H. , Payri , R. , Fransler , T. et al. IJER Editorial: The Future of the Internal Combustion Engine Int J Engine Res 21 1 3 10 2020
- Schenk , M. , Schauer , F. , Sauer , C. , Weber , G. , Hahn , J. , and Schwarz , C.
- Karl , G. , Otto , F. , Herweg , R. , Freisinger , N. , Weber , S. , and Bechtold , M.
- Zheng , M. , Tan , Y. , Mulenga , M. , and Wang , M. Thermal Efficiency Analyses of Diesel Low Temperature Combustion Cycles SAE Technical Paper 2007-01-4019 2007 https://doi.org/10.4271/2007-01-4019
- Brandt , M. , Hettinger , A. , Schneider , A. , Senftleben , H. et al.
- Li , T. , Wu , D. , and Xu , M. Thermodynamic Analysis of EGR Effects on the First and Second Law Efficiencies of a Boosted Spark-Ignited Direct-Injection Gasoline Engine Energy Conversion and Management 70 130 138 2013
- Dev , S.
- Taylor , S.C.
- Ayala , F.A. , and Heywood , J.B. Lean SI Engines: The Role of Combustion Variability in Defining Lean Limits SAE Technical Paper 2007-24-0030 2007 https://doi.org/10.4271/2007-24-0030
- Quader , A. What Limits Lean Operation in Spark Ignition Engines-Flame Initiation or Propagation SAE Technical Paper 760760 1976 https://doi.org/10.4271/760760
- Yu , X. , Yang , Z. , Yu , S. , Ives , M. , and Zheng , M.
- Lewis , B. , and Elbe , G. Combustion, Flame and Explosions of Gases Elsevier 1987
- Herweg , R. , Begleris , P. , Zettlitz , A. , and Ziegler , G.F.W. Flow Field Effects on Flame Kernel Formation in a Spark-Ignition Engine SAE Technical Paper 881639 1988 https://doi.org/10.4271/881639
- Groff , E.G. , and Sinnamon , J.F. The Effects of Ignition Location in a Swirl Field on Homogeneous-Charge Combustion SAE Technical Paper 821221 1982 https://doi.org/10.4271/821221
- Witze , P.O. The Effect of Spark Location on Combustion in a Variable-Swirl Engine SAE Technical Paper 820044 1982 https://doi.org/10.4271/820044
- Witze , P.O. Cycle-Resolved Multipoint Ionization Probe Measurements in a Spark Ignition Engine SAE Technical Paper 892099 1989 https://doi.org/10.4271/892099
- Yu , S. , and Zheng , M. Advanced Ignition System for Future Clean Combustion Engines: Review J Automotive Safety and Energy 6 4 2015
- Yu , S. , and Zheng , M. Future Gasoline Engine Ignition: A Review on Advanced Concepts International Journal of Engine Research 1468087420953085 2020 10.1177/1468087420953085
- Yang , Z. , Yu , X. , Yu , S. , Chen , J. , Chen , G. , Zheng , M. , and Ting , D.S.-K. 10.1115/icef2018-9771
- Sayama , S. , Kinoshita , M. , Mandokoro , Y. , and Fuyuto , T. Spark Ignition and Early Flame Development of Lean Mixtures under High-Velocity Flow Conditions: An Experimental Study International Journal of Engine Research 146808741774851 2019 10.1177/1468087417748517
- Zhu , H. , Yu , X. , Tan , Q. , Zheng , M. A Preliminary Study of the Discharge Current and Spark Energy for the Multi-Coil Offset Strategy SAE Technical Paper 2019-01-0725 2019 https://doi.org/10.4271/2019-01-0725
- Heywood , J.B. Second Edition 2018 978-1-26-011611-3