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Ignition Sensitivity Study of Partially Premixed Combustion by Using Shadowgraphy and OH∗ Chemiluminescence Methods

Izadi Najafabadi, Mohammad; Dam, Nico; Somers, Bart and Johansson, Bengt LU (2016) SAE 2016 World Congress and Exhibition, 2016 In SAE Technical Papers
Abstract

Partially Premixed Combustion (PPC) is a promising combustion concept for future IC engines. However, controllability of PPC is still a challenge and needs more investigation. The scope of the present study is to investigate the ignition sensitivity of PPC to the injection timing at different injection pressures. To better understand this, high-speed shadowgraphy is used to visualize fuel injection and evaporation at different Start of Injections (SOI). Spray penetration and injection targeting are derived from shadowgraphy movies. OH∗ chemiluminescence is used to comprehensively study the stratification level of combustion which is helpful for interpretation of ignition sensitivity behavior. Shadowgraphy results confirm that SOI... (More)

Partially Premixed Combustion (PPC) is a promising combustion concept for future IC engines. However, controllability of PPC is still a challenge and needs more investigation. The scope of the present study is to investigate the ignition sensitivity of PPC to the injection timing at different injection pressures. To better understand this, high-speed shadowgraphy is used to visualize fuel injection and evaporation at different Start of Injections (SOI). Spray penetration and injection targeting are derived from shadowgraphy movies. OH∗ chemiluminescence is used to comprehensively study the stratification level of combustion which is helpful for interpretation of ignition sensitivity behavior. Shadowgraphy results confirm that SOI strongly affects the spray penetration and evaporation of fuel. However, spray penetration and ignition sensitivity are barely affected by the injection pressure. There is a critical SOI range, in which a significant amount of fuel is trapped in the crevice volume. Injection in this critical range has a negative influence on the combustion efficiency and ignition sensitivity. Impingement of liquid fuel on the piston crown advances the combustion phasing by providing higher levels of stratification. Moreover, results of combustion stratification study show that stratification level has an inverse correlation with combustion phasing of PPC for late injections.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
SAE Technical Papers
publisher
SAE International
conference name
SAE 2016 World Congress and Exhibition, 2016
external identifiers
  • scopus:84979220775
DOI
10.4271/2016-01-0761
language
English
LU publication?
yes
id
e9c0ada0-29e3-4977-b0a9-b4be9f4e86de
date added to LUP
2017-02-23 10:28:26
date last changed
2017-05-10 13:34:39
@inproceedings{e9c0ada0-29e3-4977-b0a9-b4be9f4e86de,
  abstract     = {<p>Partially Premixed Combustion (PPC) is a promising combustion concept for future IC engines. However, controllability of PPC is still a challenge and needs more investigation. The scope of the present study is to investigate the ignition sensitivity of PPC to the injection timing at different injection pressures. To better understand this, high-speed shadowgraphy is used to visualize fuel injection and evaporation at different Start of Injections (SOI). Spray penetration and injection targeting are derived from shadowgraphy movies. OH∗ chemiluminescence is used to comprehensively study the stratification level of combustion which is helpful for interpretation of ignition sensitivity behavior. Shadowgraphy results confirm that SOI strongly affects the spray penetration and evaporation of fuel. However, spray penetration and ignition sensitivity are barely affected by the injection pressure. There is a critical SOI range, in which a significant amount of fuel is trapped in the crevice volume. Injection in this critical range has a negative influence on the combustion efficiency and ignition sensitivity. Impingement of liquid fuel on the piston crown advances the combustion phasing by providing higher levels of stratification. Moreover, results of combustion stratification study show that stratification level has an inverse correlation with combustion phasing of PPC for late injections.</p>},
  author       = {Izadi Najafabadi, Mohammad and Dam, Nico and Somers, Bart and Johansson, Bengt},
  booktitle    = {SAE Technical Papers},
  language     = {eng},
  publisher    = {SAE International},
  title        = {Ignition Sensitivity Study of Partially Premixed Combustion by Using Shadowgraphy and OH∗ Chemiluminescence Methods},
  url          = {http://dx.doi.org/10.4271/2016-01-0761},
  year         = {2016},
}