Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine

O'Connor, Jacqueline; Musculus, Mark P. B.; Pickett, Lyle M.

doi:10.1016/j.combustflame.2016.03.031

Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine

Journal Article · Mon May 30 00:00:00 EDT 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.03.031· OSTI ID:1326655

O'Connor, Jacqueline ^[1]; Musculus, Mark P. B. ^[2]; Pickett, Lyle M. ^[2]

Pennsylvania State Univ., University Park, PA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Program (EE-2G)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1326655

Alternate ID(s):: OSTI ID: 1334829

Report Number(s):: SAND--2015-9856M; PII: S0010218016300748

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 170; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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The Effect of Splitting Timing on Mixing in a Jet with Double Injections: A Large-Eddy Simulation Study Hadadpour, Ahmad; Jangi, Mehdi; Bai, Xue Song Flow, Turbulence and Combustion, Vol. 101, Issue 4 https://doi.org/10.1007/s10494-018-9904-8	journal	April 2018
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Optical study on characteristics of non-reacting and reacting diesel spray with different strategies of split injection Desantes, Jose M.; García-Oliver, José M.; García, Antonio International Journal of Engine Research, Vol. 20, Issue 6 https://doi.org/10.1177/1468087418773012	journal	May 2018
Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals Payri, Raúl; Gimeno, Jaime; Martí-Aldaraví, Pedro International Journal of Engine Research https://doi.org/10.1177/1468087419894854	journal	January 2020

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