Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine
Abstract
This work explores the mechanisms by which a post injection can reduce unburned hydrocarbon (UHC) emissions in heavy-duty diesel engines operating at low-temperature combustion conditions. Post injections, small, close-coupled injections of fuel after the main injection, have been shown to reduce UHC in the authors’ previous work. In this work, we analyze optical data from laser-induced fluorescence of both CH2O and OH and use chemical reactor modeling to better understand the mechanism by which post injections reduce UHC emissions. The results indicate that post-injection efficacy, or the extent to which a post injection reduces UHC emissions, is a strong function of the cylinder pressure variation during the post injection. However, the data and analysis indicate that the pressure and temperature rise from the post injection combustion cannot solely explain the UHC reduction measured by both engine-out and optical diagnostics. In conclusion, the fluid-mechanic, thermal, and chemical interaction of the post injection with the main-injection mixture is a key part of UHC reduction; the starting action of the post jet and the subsequent entrainment of surrounding gases are likely both important processes in reducing UHC with a post injection.
- Authors:
-
- Pennsylvania State Univ., University Park, PA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- 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 (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO)
- OSTI Identifier:
- 1326655
- Alternate Identifier(s):
- OSTI ID: 1334829
- Report Number(s):
- SAND-2015-9856M
Journal ID: ISSN 0010-2180; PII: S0010218016300748
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Combustion and Flame
- Additional Journal Information:
- Journal Volume: 170; Journal Issue: C; Journal ID: ISSN 0010-2180
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 33 ADVANCED PROPULSION SYSTEMS; low-temperature combustion; unburned hydrocarbon emissions; post injections; heavy-duty diesel
Citation Formats
O'Connor, Jacqueline, Musculus, Mark P. B., and Pickett, Lyle M. Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine. United States: N. p., 2016.
Web. doi:10.1016/j.combustflame.2016.03.031.
O'Connor, Jacqueline, Musculus, Mark P. B., & Pickett, Lyle M. Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine. United States. https://doi.org/10.1016/j.combustflame.2016.03.031
O'Connor, Jacqueline, Musculus, Mark P. B., and Pickett, Lyle M. Mon .
"Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine". United States. https://doi.org/10.1016/j.combustflame.2016.03.031. https://www.osti.gov/servlets/purl/1326655.
@article{osti_1326655,
title = {Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine},
author = {O'Connor, Jacqueline and Musculus, Mark P. B. and Pickett, Lyle M.},
abstractNote = {This work explores the mechanisms by which a post injection can reduce unburned hydrocarbon (UHC) emissions in heavy-duty diesel engines operating at low-temperature combustion conditions. Post injections, small, close-coupled injections of fuel after the main injection, have been shown to reduce UHC in the authors’ previous work. In this work, we analyze optical data from laser-induced fluorescence of both CH2O and OH and use chemical reactor modeling to better understand the mechanism by which post injections reduce UHC emissions. The results indicate that post-injection efficacy, or the extent to which a post injection reduces UHC emissions, is a strong function of the cylinder pressure variation during the post injection. However, the data and analysis indicate that the pressure and temperature rise from the post injection combustion cannot solely explain the UHC reduction measured by both engine-out and optical diagnostics. In conclusion, the fluid-mechanic, thermal, and chemical interaction of the post injection with the main-injection mixture is a key part of UHC reduction; the starting action of the post jet and the subsequent entrainment of surrounding gases are likely both important processes in reducing UHC with a post injection.},
doi = {10.1016/j.combustflame.2016.03.031},
journal = {Combustion and Flame},
number = C,
volume = 170,
place = {United States},
year = {Mon May 30 00:00:00 EDT 2016},
month = {Mon May 30 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals
journal, January 2020
- Payri, Raúl; Gimeno, Jaime; Martí-Aldaraví, Pedro
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The Effect of Splitting Timing on Mixing in a Jet with Double Injections: A Large-Eddy Simulation Study
journal, April 2018
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The Effect of Splitting Timing on Mixing in a Jet with Double Injections: A Large-Eddy Simulation Study
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