An investigation of the effect of post-injection schemes on soot reduction potential using optical diagnostics in a single-cylinder optical diesel engine
File(s)
Accepted version
Author(s)
Hardalupas, Yiannis
Hong, Christopher
Keramiotis, Christos
Ramaswamy, Kumara Gurubaran
Soulopoulos, N
Type
Journal Article
Abstract
This work employs a combination of pressure trace analysis, high-speed optical measurements and laser-based techniques for the assessment of the effects of various post-injection schemes on the soot reduction potential in an optical single-cylinder light-duty diesel engine. The engine was operated under a multiple injection scheme of two pilot and one main injection, typical of a partially premixed combustion mode, at the lower end of the load and engine speed range (ca 2.0 bar IMEP at 1200 r/min). Experiments considering the influence of the post-injection fuel amount (up to 15% of the total fuel quantity per cycle) and the post-injection timing within the expansion stroke (5, 10 and 15 CAD aTDC), under a constant total fuel mass per cycle, have been conducted. Findings were analysed via means of pressure trace and apparent rate of heat transfer analyses, as well as a series of optical diagnostic techniques, namely, high-speed flame natural luminosity imaging, CH*, C∗2 and OH* line-of-sight chemiluminescence, as well as planar laser-induced incandescence measurements at 31 and 50 CAD aTDC. The combination of post-injection fuel amount and timing has substantial effects on charge reactivity and soot oxidation potential. The analysis reveals that an amount of fuel (7% of the total fuel mass per cycle) injected more than 10 CAD after the main combustion event leads to higher levels of soot emissions, while a larger amount of fuel (15% of the total fuel mass) injected 5 CAD after the main combustion event appears to have a beneficial effect on the soot oxidation processes. Overall, results indicate that a post-injection scheme close to the main combustion phasing could reduce soot levels and improve engine performance, that is, higher IMEP levels at the same fuel consumption rates, although it could increase engine noise.
Date Issued
2017-08-01
Date Acceptance
2016-11-01
Citation
International Journal of Engine Research, 2017, 18 (5-6), pp.400-411
ISSN
1468-0874
Publisher
SAGE Publications
Start Page
400
End Page
411
Journal / Book Title
International Journal of Engine Research
Volume
18
Issue
5-6
Copyright Statement
© IMechE 2016. The final, definitive version of this paper has been published in 1.
Hardalupas Y, Hong C, Keramiotis C, et al. An investigation of the effect of post-injection schemes on soot reduction potential using optical diagnostics in a single-cylinder optical diesel engine. International Journal of Engine Research. 2017;18(5-6):400-411 by Sage Publications Ltd. All rights reserved. It is available at: https://doi.org/10.1177/1468087416672511
Hardalupas Y, Hong C, Keramiotis C, et al. An investigation of the effect of post-injection schemes on soot reduction potential using optical diagnostics in a single-cylinder optical diesel engine. International Journal of Engine Research. 2017;18(5-6):400-411 by Sage Publications Ltd. All rights reserved. It is available at: https://doi.org/10.1177/1468087416672511
Sponsor
Commission of the European Communities
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000406754100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
PITN-GA-2013-607214
Subjects
Science & Technology
Physical Sciences
Technology
Thermodynamics
Engineering, Mechanical
Transportation Science & Technology
Engineering
Transportation
Single-cylinder optical engine
partially premixed combustion
soot
chemiluminescence
post-injections
laser-induced incandescence
LASER-INDUCED INCANDESCENCE
INTERNAL-COMBUSTION ENGINES
STRATEGIES
RATIO
FUEL
CHEMILUMINESCENCE
FLAMES
Publication Status
Published
Date Publish Online
2016-11-03