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Interaction between Fuel Jets and Prevailing Combustion During Closely-Coupled Injections in an Optical LD Diesel Engine

Denny, Michael LU ; Matamis, Alexios LU ; Persson, Håkan LU ; Richter, Mattias LU and Andersson, Öivind LU (2019) SAE World Congress Experience, WCX 2019 In SAE Technical Papers
Abstract
Two imaging techniques are used to investigate the interaction between developed combustion from earlier injections and partially oxidized fuel (POF) of
a subsequent injection. The latter is visualized by using planar laser induced fluorescence (PLIF) of formaldehyde and poly-cyclic aromatic hydrocarbons. High speed imaging captures the natural luminescence (NL) of the prevailing combustion. Three different fuel injection strategies are studied. One strategy consists of two pilot injections, with modest separations after each, followed by single main and post injections. Both of the other two strategies have three
pilots followed by single main and post injections. The separations after the second and third pilots are several times... (More)
Two imaging techniques are used to investigate the interaction between developed combustion from earlier injections and partially oxidized fuel (POF) of
a subsequent injection. The latter is visualized by using planar laser induced fluorescence (PLIF) of formaldehyde and poly-cyclic aromatic hydrocarbons. High speed imaging captures the natural luminescence (NL) of the prevailing combustion. Three different fuel injection strategies are studied. One strategy consists of two pilot injections, with modest separations after each, followed by single main and post injections. Both of the other two strategies have three
pilots followed by single main and post injections. The separations after the second and third pilots are several times shorter than in the reference case (making them closelycoupled). The closely-coupled cases have more linear heat
release rates (HRR) which lead to much lower combustion noise levels. For all cases, POF is detected during the very weak HRR before the notable combustion of the first pilot injection’s fuel. When the subsequent fuel injections overlap
with a local decrease in HRR, the prevailing combustion is to some degree extinguished during these phases. This is seen via the NL signal being replaced by the POF signal, indicating that hotter combustion products are being replaced by cooler ones. When the NL and POF regions spatially overlap, the POF signal decreases, and there is no injection, this marks the further oxidation of the POF into hotter combustion products. This extinguishing phenomenon can, to a lesser extent than closely-coupling, affect the combustion noise by affecting the magnitude of the local dips in the HRR, which via its influence on the pressure trace, affects combustion noise. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
SAE Technical Paper
series title
SAE Technical Papers
pages
15 pages
publisher
SAE International
conference name
SAE World Congress Experience, WCX 2019
conference location
Detroit, United States
conference dates
2019-04-09 - 2019-04-11
external identifiers
  • scopus:85064593236
ISSN
0148-7191
DOI
10.4271/2019-01-0551
language
English
LU publication?
yes
id
8e6feede-110b-4ec6-9000-124427cd75c2
date added to LUP
2019-03-29 16:21:55
date last changed
2019-05-05 04:51:23
@inproceedings{8e6feede-110b-4ec6-9000-124427cd75c2,
  abstract     = {Two imaging techniques are used to investigate the interaction between developed combustion from earlier injections and partially oxidized fuel (POF) of<br/>a subsequent injection. The latter is visualized by using planar laser induced fluorescence (PLIF) of formaldehyde and poly-cyclic aromatic hydrocarbons. High speed imaging captures the natural luminescence (NL) of the prevailing combustion. Three different fuel injection strategies are studied. One strategy consists of two pilot injections, with modest separations after each, followed by single main and post injections. Both of the other two strategies have three<br/>pilots followed by single main and post injections. The separations after the second and third pilots are several times shorter than in the reference case (making them closelycoupled). The closely-coupled cases have more linear heat<br/>release rates (HRR) which lead to much lower combustion noise levels. For all cases, POF is detected during the very weak HRR before the notable combustion of the first pilot injection’s fuel. When the subsequent fuel injections overlap<br/>with a local decrease in HRR, the prevailing combustion is to some degree extinguished during these phases. This is seen via the NL signal being replaced by the POF signal, indicating that hotter combustion products are being replaced by cooler ones. When the NL and POF regions spatially overlap, the POF signal decreases, and there is no injection, this marks the further oxidation of the POF into hotter combustion products. This extinguishing phenomenon can, to a lesser extent than closely-coupling, affect the combustion noise by affecting the magnitude of the local dips in the HRR, which via its influence on the pressure trace, affects combustion noise.},
  author       = {Denny, Michael and Matamis, Alexios and Persson, Håkan and Richter, Mattias and Andersson, Öivind},
  booktitle    = {SAE Technical Papers},
  issn         = {0148-7191},
  language     = {eng},
  location     = {Detroit, United States},
  month        = {04},
  pages        = {15},
  publisher    = {SAE International},
  title        = {Interaction between Fuel Jets and Prevailing Combustion During Closely-Coupled Injections in an Optical LD Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2019-01-0551},
  year         = {2019},
}