Tailoring Charge Reactivity Using In-Cylinder Generated Reformate for Gasoline Compression Ignition Strategies
Abstract
In-cylinder reforming of injected fuel during a negative valve overlap (NVO) recompression period can be used to optimize main-cycle combustion phasing for low-load low-temperature gasoline combustion (LTGC). The objective of this work is to examine the effects of reformate composition on main-cycle engine performance. An alternate-fire sequence was used to generate a common exhaust temperature and composition boundary condition for a cycle-of-interest, with performance metrics measured for these custom cycles. NVO reformate was also separately collected using a dump valve apparatus and characterized by both gas chromatography and photoionization mass spectroscopy. To facilitate gas sample analysis, sampling experiments were conducted using a five-component gasoline surrogate (isooctane, n-heptane, ethanol, 1-hexene, and toluene) that matched the molecular composition, 50% boiling point, and ignition characteristics of the research gasoline. For the gasoline, it was found that an advance of the NVO start-of-injection (SOI) led to a corresponding advance in main-period combustion phasing as the combination of longer residence times and lower amounts of liquid spray piston impingement led to a greater degree of fuel decomposition. The effect was more pronounced as the fraction of total fuel injected in the NVO period increased. Main-period combustion phasing was also found to advance as the main-periodmore »
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Tula Technology, Inc., San Jose, CA (United States(
- Univ. of Minnesota, Minneapolis, MN (United States)
- Braunschweig Univ. of Technology (Germany)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Vehicle Technologies Office
- OSTI Identifier:
- 1469636
- Report Number(s):
- SAND2018-9577J
Journal ID: ISSN 0742-4795; 667499
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Engineering for Gas Turbines and Power
- Additional Journal Information:
- Journal Volume: 139; Journal Issue: 12; Journal ID: ISSN 0742-4795
- Publisher:
- ASME
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Ekoto, Isaac W., Wolk, Benjamin M., Northrop, William F., Hansen, Nils, and Moshammer, Kai. Tailoring Charge Reactivity Using In-Cylinder Generated Reformate for Gasoline Compression Ignition Strategies. United States: N. p., 2017.
Web. doi:10.1115/1.4037207.
Ekoto, Isaac W., Wolk, Benjamin M., Northrop, William F., Hansen, Nils, & Moshammer, Kai. Tailoring Charge Reactivity Using In-Cylinder Generated Reformate for Gasoline Compression Ignition Strategies. United States. https://doi.org/10.1115/1.4037207
Ekoto, Isaac W., Wolk, Benjamin M., Northrop, William F., Hansen, Nils, and Moshammer, Kai. Wed .
"Tailoring Charge Reactivity Using In-Cylinder Generated Reformate for Gasoline Compression Ignition Strategies". United States. https://doi.org/10.1115/1.4037207. https://www.osti.gov/servlets/purl/1469636.
@article{osti_1469636,
title = {Tailoring Charge Reactivity Using In-Cylinder Generated Reformate for Gasoline Compression Ignition Strategies},
author = {Ekoto, Isaac W. and Wolk, Benjamin M. and Northrop, William F. and Hansen, Nils and Moshammer, Kai},
abstractNote = {In-cylinder reforming of injected fuel during a negative valve overlap (NVO) recompression period can be used to optimize main-cycle combustion phasing for low-load low-temperature gasoline combustion (LTGC). The objective of this work is to examine the effects of reformate composition on main-cycle engine performance. An alternate-fire sequence was used to generate a common exhaust temperature and composition boundary condition for a cycle-of-interest, with performance metrics measured for these custom cycles. NVO reformate was also separately collected using a dump valve apparatus and characterized by both gas chromatography and photoionization mass spectroscopy. To facilitate gas sample analysis, sampling experiments were conducted using a five-component gasoline surrogate (isooctane, n-heptane, ethanol, 1-hexene, and toluene) that matched the molecular composition, 50% boiling point, and ignition characteristics of the research gasoline. For the gasoline, it was found that an advance of the NVO start-of-injection (SOI) led to a corresponding advance in main-period combustion phasing as the combination of longer residence times and lower amounts of liquid spray piston impingement led to a greater degree of fuel decomposition. The effect was more pronounced as the fraction of total fuel injected in the NVO period increased. Main-period combustion phasing was also found to advance as the main-period fueling decreased. Slower kinetics for leaner mixtures were offset by a combination of increased bulk-gas temperature from higher charge specific heat ratios and increased fuel reactivity due to higher charge reformate fractions.},
doi = {10.1115/1.4037207},
journal = {Journal of Engineering for Gas Turbines and Power},
number = 12,
volume = 139,
place = {United States},
year = {Wed Aug 09 00:00:00 EDT 2017},
month = {Wed Aug 09 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
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