The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85
Abstract
Lean operation of Spark-Ignition engines can provide higher thermal efficiency compared to standard stoichiometric operation. However, for a homogeneous lean mixture, the associated reduction of flame speeds becomes an important issue from the perspective of robust ignition and fast flame spread throughout the charge. This study is focused on the use of a lean partial fuel stratification strategy that can stabilize the deflagration, while sufficiently fast combustion is ensured via the use of end-gas autoignition. The engine has a spray-guided Direct-Injection Spark-Ignition combustion system and was fueled with either a high-octane certification gasoline or E85. Partial fuel stratification was achieved using several fuel injections during the intake stroke in combination with a small pilot-injection concurrent with the Spark-Ignition. The results reveal that partial fuel stratification enables very stable combustion, offering higher thermal efficiency for parts of the load range in comparison to well-mixed lean and stoichiometric combustion. The heat release and flame imaging demonstrate that the combustion often has three distinct stages. The combustion of the pilot-injected fuel, ignited by the normal spark, acts as a “super igniter,” ensuring a very repeatable initiation of combustion, and flame incandescence reveals locally rich conditions. The second stage is mainly composed of bluemore »
- Authors:
-
- School of Automotive Studies, Tongji University, Shanghai, China, Sandia National Laboratories, Livermore, CA, USA
- School of Automotive Studies, Tongji University, Shanghai, China
- Sandia National Laboratories, Livermore, CA, USA
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
- OSTI Identifier:
- 1579976
- Alternate Identifier(s):
- OSTI ID: 1595032
- Report Number(s):
- SAND-2019-15160J
Journal ID: ISSN 1468-0874
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- Resource Type:
- Published Article
- Journal Name:
- International Journal of Engine Research
- Additional Journal Information:
- Journal Name: International Journal of Engine Research Journal Volume: 21 Journal Issue: 9; Journal ID: ISSN 1468-0874
- Publisher:
- SAGE
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 33 ADVANCED PROPULSION SYSTEMS; Lean Spark-Ignition engine operation; controlled end-gas autoignition; partial fuel stratification; alternative fuels; high efficiency
Citation Formats
Hu, Zongjie, Zhang, Junjie, Sjöberg, Magnus, and Zeng, Wei. The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85. United Kingdom: N. p., 2019.
Web. doi:10.1177/1468087419889702.
Hu, Zongjie, Zhang, Junjie, Sjöberg, Magnus, & Zeng, Wei. The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85. United Kingdom. https://doi.org/10.1177/1468087419889702
Hu, Zongjie, Zhang, Junjie, Sjöberg, Magnus, and Zeng, Wei. Thu .
"The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85". United Kingdom. https://doi.org/10.1177/1468087419889702.
@article{osti_1579976,
title = {The use of partial fuel stratification to enable stable ultra-lean deflagration-based Spark-Ignition engine operation with controlled end-gas autoignition of gasoline and E85},
author = {Hu, Zongjie and Zhang, Junjie and Sjöberg, Magnus and Zeng, Wei},
abstractNote = {Lean operation of Spark-Ignition engines can provide higher thermal efficiency compared to standard stoichiometric operation. However, for a homogeneous lean mixture, the associated reduction of flame speeds becomes an important issue from the perspective of robust ignition and fast flame spread throughout the charge. This study is focused on the use of a lean partial fuel stratification strategy that can stabilize the deflagration, while sufficiently fast combustion is ensured via the use of end-gas autoignition. The engine has a spray-guided Direct-Injection Spark-Ignition combustion system and was fueled with either a high-octane certification gasoline or E85. Partial fuel stratification was achieved using several fuel injections during the intake stroke in combination with a small pilot-injection concurrent with the Spark-Ignition. The results reveal that partial fuel stratification enables very stable combustion, offering higher thermal efficiency for parts of the load range in comparison to well-mixed lean and stoichiometric combustion. The heat release and flame imaging demonstrate that the combustion often has three distinct stages. The combustion of the pilot-injected fuel, ignited by the normal spark, acts as a “super igniter,” ensuring a very repeatable initiation of combustion, and flame incandescence reveals locally rich conditions. The second stage is mainly composed of blue flame propagation in a well-mixed lean mixture. The third stage is the compression autoignition of a well-mixed and typically very lean end-gas. The end-gas autoignition is critical for achieving high combustion efficiency, high thermal efficiency, and stable combustion. Partial fuel stratification enables very effective combustion-phasing control, which is critical for controlling the occurrence and intensity of end-gas autoignition. Finally, comparing the gasoline and E85 fuels, it is noted that achieving end-gas autoignition for the higher octane E85 requires a more aggressive compression of the end-gas via the use of a more advanced combustion phasing or higher intake-air temperature.},
doi = {10.1177/1468087419889702},
journal = {International Journal of Engine Research},
number = 9,
volume = 21,
place = {United Kingdom},
year = {2019},
month = {12}
}
https://doi.org/10.1177/1468087419889702
Web of Science
Works referenced in this record:
Combined Effects of Fuel and Dilution Type on Efficiency Gains of Lean Well-Mixed DISI Engine Operation with Enhanced Ignition and Intake Heating for Enabling Mixed-Mode Combustion
journal, April 2016
- Sjöberg, Magnus; Zeng, Wei
- SAE International Journal of Engines, Vol. 9, Issue 2
Selection Criteria and Screening of Potential Biomass-Derived Streams as Fuel Blendstocks for Advanced Spark-Ignition Engines
journal, March 2017
- McCormick, Robert L.; Fioroni, Gina; Fouts, Lisa
- SAE International Journal of Fuels and Lubricants, Vol. 10, Issue 2
Role of Engine Speed and In-Cylinder Flow Field for Stratified and Well-Mixed DISI Engine Combustion Using E70
journal, April 2014
- Sjöberg, Magnus; Zeng, Wei; Reuss, David
- SAE International Journal of Engines, Vol. 7, Issue 2
Spectroscopic and chemical-kinetic analysis of the phases of HCCI autoignition and combustion for single- and two-stage ignition fuels
journal, August 2008
- Hwang, Wontae; Dec, John; Sjöberg, Magnus
- Combustion and Flame, Vol. 154, Issue 3
Combined effects of flow/spray interactions and EGR on combustion variability for a stratified DISI engine
journal, January 2015
- Zeng, Wei; Sjöberg, Magnus; Reuss, David L.
- Proceedings of the Combustion Institute, Vol. 35, Issue 3
The role of spray-enhanced swirl flow for combustion stabilization in a stratified-charge DISI engine
journal, June 2016
- Zeng, Wei; Sjöberg, Magnus; Reuss, David L.
- Combustion and Flame, Vol. 168
Effect of Heat of Vaporization, Chemical Octane, and Sensitivity on Knock Limit for Ethanol - Gasoline Blends
journal, January 2012
- Stein, Robert A.; Polovina, Dusan; Roth, Kevin
- SAE International Journal of Fuels and Lubricants, Vol. 5, Issue 2
Laminar burning velocity of gasolines with addition of ethanol
journal, January 2014
- Dirrenberger, P.; Glaude, P. A.; Bounaceur, R.
- Fuel, Vol. 115
Performance Studies and Correlation between Vehicle- and Rapid- Aged Commercial Lean NOx Trap Catalysts
journal, February 2017
- De Abreu Goes, Jesus Emmanuel; Olsson, Louise; Berggrund, Malin
- SAE International Journal of Engines, Vol. 10, Issue 4
Combined effects of intake flow and spark-plug location on flame development, combustion stability and end-gas autoignition for lean spark-ignition engine operation using E30 fuel
journal, August 2017
- Sjöberg, Magnus; He, Xu
- International Journal of Engine Research, Vol. 19, Issue 1
On Knock Intensity and Superknock in SI Engines
journal, February 2017
- Kalghatgi, Gautam; Algunaibet, Ibrahim; Morganti, Kai
- SAE International Journal of Engines, Vol. 10, Issue 3
Piston geometry effects in a light-duty, swirl-supported diesel engine: Flow structure characterization
journal, December 2017
- Perini, Federico; Zha, Kan; Busch, Stephen
- International Journal of Engine Research, Vol. 19, Issue 10
NO x -Reduction by Injection-Timing Retard in a Stratified-Charge DISI Engine using Gasoline and E85
journal, January 2012
- Sjöberg, Magnus; Reuss, David
- SAE International Journal of Fuels and Lubricants, Vol. 5, Issue 3
High-speed imaging of spray-guided DISI engine combustion with near-TDC injection of E85 for ultra-low NO and soot
journal, January 2013
- Sjöberg, Magnus; Reuss, David L.
- Proceedings of the Combustion Institute, Vol. 34, Issue 2
Invited Review: Combustion instability in spray-guided stratified-charge engines: A review
journal, February 2015
- Fansler, Todd D.; Reuss, David L.; Sick, Volker
- International Journal of Engine Research, Vol. 16, Issue 3
Comparison of Compression Ignition Engine Noise Metrics in Low-Temperature Combustion Regimes
journal, April 2013
- Shahlari, Arsham J.; Hocking, Chris; Kurtz, Eric
- SAE International Journal of Engines, Vol. 6, Issue 1
Tailoring HCCI heat-release rates with partial fuel stratification: Comparison of two-stage and single-stage-ignition fuels
journal, January 2011
- Yang, Yi; Dec, John E.; Dronniou, Nicolas
- Proceedings of the Combustion Institute, Vol. 33, Issue 2
Using PIV Measurements to Determine the Role of the In-Cylinder Flow Field for Stratified DISI Engine Combustion
journal, April 2014
- Zeng, Wei; Sjöberg, Magnus; Reuss, David
- SAE International Journal of Engines, Vol. 7, Issue 2