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Effects of different injection strategies on ignition and combustion characteristics in an optical PPC engine

Zhang, Miao LU ; Derafshzan, Saeed LU ; Richter, Mattias LU and Lundgren, Marcus LU (2020) In Energy 203.
Abstract

Although multiple injection strategies have a significant influence on partially premixed combustion (PPC) efficiency, the mechanisms behind the influence are still to be explained and evaluated. In this paper, single, double, and triple injection strategies are used in a heavy-duty optical engine. The effects on engine efficiency are analyzed by an energy balance method. Furthermore, the change of ignition location and combustion process under different injection cases are explored by natural luminescence recorded by a high-speed camera. The results show that, with double injections, the interaction between the main and pilot jets advances the combustion phasing nearly to the top dead center (TDC), resulting in higher efficiency. This... (More)

Although multiple injection strategies have a significant influence on partially premixed combustion (PPC) efficiency, the mechanisms behind the influence are still to be explained and evaluated. In this paper, single, double, and triple injection strategies are used in a heavy-duty optical engine. The effects on engine efficiency are analyzed by an energy balance method. Furthermore, the change of ignition location and combustion process under different injection cases are explored by natural luminescence recorded by a high-speed camera. The results show that, with double injections, the interaction between the main and pilot jets advances the combustion phasing nearly to the top dead center (TDC), resulting in higher efficiency. This interaction also shifts the combustion process into the piston bowl, where it has high potential to reduce heat-transfer loss. With triple injections, the interaction between the main combustion (formed by the pilot and main injections) and the post injection jet significantly affects the combustion losses. In all, the jet-jet interaction and combustion-jet interactions play a significant role in engine efficiency when using multiple injections.

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type
Contribution to journal
publication status
published
subject
in
Energy
volume
203
article number
117901
publisher
Elsevier
external identifiers
  • scopus:85085177161
ISSN
0360-5442
DOI
10.1016/j.energy.2020.117901
language
English
LU publication?
yes
id
64d01e3d-42e6-4b76-befc-d80c0485ebee
date added to LUP
2020-06-12 12:21:51
date last changed
2020-06-13 02:41:21
@article{64d01e3d-42e6-4b76-befc-d80c0485ebee,
  abstract     = {<p>Although multiple injection strategies have a significant influence on partially premixed combustion (PPC) efficiency, the mechanisms behind the influence are still to be explained and evaluated. In this paper, single, double, and triple injection strategies are used in a heavy-duty optical engine. The effects on engine efficiency are analyzed by an energy balance method. Furthermore, the change of ignition location and combustion process under different injection cases are explored by natural luminescence recorded by a high-speed camera. The results show that, with double injections, the interaction between the main and pilot jets advances the combustion phasing nearly to the top dead center (TDC), resulting in higher efficiency. This interaction also shifts the combustion process into the piston bowl, where it has high potential to reduce heat-transfer loss. With triple injections, the interaction between the main combustion (formed by the pilot and main injections) and the post injection jet significantly affects the combustion losses. In all, the jet-jet interaction and combustion-jet interactions play a significant role in engine efficiency when using multiple injections.</p>},
  author       = {Zhang, Miao and Derafshzan, Saeed and Richter, Mattias and Lundgren, Marcus},
  issn         = {0360-5442},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Energy},
  title        = {Effects of different injection strategies on ignition and combustion characteristics in an optical PPC engine},
  url          = {http://dx.doi.org/10.1016/j.energy.2020.117901},
  doi          = {10.1016/j.energy.2020.117901},
  volume       = {203},
  year         = {2020},
}