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Optical Study of Fuel Spray Penetration and Initial Combustion Location under PPC Conditions

Lönn, Sara LU ; Matamis, Alexios LU ; Tuner, Martin LU ; Richter, Mattias LU and Andersson, Oivind LU (2017) In SAE Technical Papers 2017-March(March).
Abstract

Low temperature combustion modes, such as Homogeneous Charge Compression Ignition (HCCI) and Partially Premixed Combustion (PPC), have been researched over recent decades since the concepts show promise for high efficiency and low emissions compared to conventional diesel combustion. PPC is an intermediate combustion type ranging from HCCI-like combustion to diesel-like combustion. The purpose of this paper is to study optically how the combustion and ignition are affected by different start of injection (SOI) timings. The study is carried out in an optically accessible heavy-duty single-cylinder engine with swirl. The intake pressure was kept constant while the intake temperature was varied to keep the combustion phasing (CA50)... (More)

Low temperature combustion modes, such as Homogeneous Charge Compression Ignition (HCCI) and Partially Premixed Combustion (PPC), have been researched over recent decades since the concepts show promise for high efficiency and low emissions compared to conventional diesel combustion. PPC is an intermediate combustion type ranging from HCCI-like combustion to diesel-like combustion. The purpose of this paper is to study optically how the combustion and ignition are affected by different start of injection (SOI) timings. The study is carried out in an optically accessible heavy-duty single-cylinder engine with swirl. The intake pressure was kept constant while the intake temperature was varied to keep the combustion phasing (CA50) constant at ∼3 CAD atdc during an SOI sweep. The fuel used is a mix of primary reference fuels with octane number 81. To determine where the combustion starts, high-speed combustion imaging is used to detect the natural luminosity. The liquid spray is detected by illuminating the combustion chamber by laser diodes and utilizing the Mie scattering. The results indicate that the change in ignition behavior is affected by the interaction between the fuel spray and the piston, as different fuel/air ratios are formed in the squish region and in the bowl.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SAE Technical Papers
volume
2017-March
issue
March
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85019012895
ISSN
0148-7191
DOI
10.4271/2017-01-0752
language
English
LU publication?
yes
id
da878de4-4678-47d4-bec1-37cc852c03bb
date added to LUP
2017-06-08 10:02:48
date last changed
2017-06-08 10:02:48
@article{da878de4-4678-47d4-bec1-37cc852c03bb,
  abstract     = {<p>Low temperature combustion modes, such as Homogeneous Charge Compression Ignition (HCCI) and Partially Premixed Combustion (PPC), have been researched over recent decades since the concepts show promise for high efficiency and low emissions compared to conventional diesel combustion. PPC is an intermediate combustion type ranging from HCCI-like combustion to diesel-like combustion. The purpose of this paper is to study optically how the combustion and ignition are affected by different start of injection (SOI) timings. The study is carried out in an optically accessible heavy-duty single-cylinder engine with swirl. The intake pressure was kept constant while the intake temperature was varied to keep the combustion phasing (CA50) constant at ∼3 CAD atdc during an SOI sweep. The fuel used is a mix of primary reference fuels with octane number 81. To determine where the combustion starts, high-speed combustion imaging is used to detect the natural luminosity. The liquid spray is detected by illuminating the combustion chamber by laser diodes and utilizing the Mie scattering. The results indicate that the change in ignition behavior is affected by the interaction between the fuel spray and the piston, as different fuel/air ratios are formed in the squish region and in the bowl.</p>},
  author       = {Lönn, Sara and Matamis, Alexios and Tuner, Martin and Richter, Mattias and Andersson, Oivind},
  issn         = {0148-7191},
  language     = {eng},
  month        = {03},
  number       = {March},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Technical Papers},
  title        = {Optical Study of Fuel Spray Penetration and Initial Combustion Location under PPC Conditions},
  url          = {http://dx.doi.org/10.4271/2017-01-0752},
  volume       = {2017-March},
  year         = {2017},
}