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Effect of piston bowl geometry and compression ratio on in-cylinder combustion and engine performance in a gasoline direct-injection compression ignition engine under different injection conditions

Xu, Leilei LU ; Bai, Xue Song LU ; Li, Yaopeng LU ; Treacy, Mark LU ; Li, Changle LU ; Tunestål, Per LU ; Tunér, Martin LU and Lu, Xingcai (2020) In Applied Energy 280.
Abstract

Low temperature combustion (LTC) of high-octane number fuels in compression ignition engines offers an opportunity to simultaneously achieve high engine thermal efficiency and low emissions of NOx and particulate matter without using expensive after-treatment technologies. LTC engines are known to be sensitive to the operation conditions and combustor geometry. It is important to understand the fundamental flow and combustion physics in order to develop the technology further for commercial application. A joint numerical and experimental investigation was conducted in a heavy-duty compression ignition engine using a primary reference fuel with an octane number of 81 to investigate the effects of injection timing, piston... (More)

Low temperature combustion (LTC) of high-octane number fuels in compression ignition engines offers an opportunity to simultaneously achieve high engine thermal efficiency and low emissions of NOx and particulate matter without using expensive after-treatment technologies. LTC engines are known to be sensitive to the operation conditions and combustor geometry. It is important to understand the fundamental flow and combustion physics in order to develop the technology further for commercial application. A joint numerical and experimental investigation was conducted in a heavy-duty compression ignition engine using a primary reference fuel with an octane number of 81 to investigate the effects of injection timing, piston geometry, and compression ratio (CR) on the fuel/air mixing and combustion covering different regimes of LTC engines, homogeneous charge compression ignition (HCCI), partially premixed combustion (PPC), and the transition regime from HCCI to PPC. The results show that with the same combustion timing, a higher CR leads to a lower NOx, but a higher emission of UHC and CO. The piston geometry shows a significant impact on the combustion and emission process in the transition regime while it has minor influence in the HCCI and PPC regimes. It is found that high engine efficiency and low emissions of NOx, CO and UHC can be achieved in the earlier PPC regime and later transition regime. The fundamental reason behind this is the stratification of the mixture in composition, temperature and reactivity, which is dictated by the interaction between the spray and the cylinder/piston walls.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Compression ratio, Fuel stratification, Homogeneous charge compression ignition (HCCI), Partially premixed combustion (PPC), Piston geometry, Transition
in
Applied Energy
volume
280
article number
115920
publisher
Elsevier
external identifiers
  • scopus:85091751233
ISSN
0306-2619
DOI
10.1016/j.apenergy.2020.115920
language
English
LU publication?
yes
id
89dcbc95-9920-4330-abc2-4fed815ff7dd
date added to LUP
2020-10-27 11:14:58
date last changed
2020-10-28 02:10:57
@article{89dcbc95-9920-4330-abc2-4fed815ff7dd,
  abstract     = {<p>Low temperature combustion (LTC) of high-octane number fuels in compression ignition engines offers an opportunity to simultaneously achieve high engine thermal efficiency and low emissions of NO<sub>x</sub> and particulate matter without using expensive after-treatment technologies. LTC engines are known to be sensitive to the operation conditions and combustor geometry. It is important to understand the fundamental flow and combustion physics in order to develop the technology further for commercial application. A joint numerical and experimental investigation was conducted in a heavy-duty compression ignition engine using a primary reference fuel with an octane number of 81 to investigate the effects of injection timing, piston geometry, and compression ratio (CR) on the fuel/air mixing and combustion covering different regimes of LTC engines, homogeneous charge compression ignition (HCCI), partially premixed combustion (PPC), and the transition regime from HCCI to PPC. The results show that with the same combustion timing, a higher CR leads to a lower NO<sub>x</sub>, but a higher emission of UHC and CO. The piston geometry shows a significant impact on the combustion and emission process in the transition regime while it has minor influence in the HCCI and PPC regimes. It is found that high engine efficiency and low emissions of NO<sub>x</sub>, CO and UHC can be achieved in the earlier PPC regime and later transition regime. The fundamental reason behind this is the stratification of the mixture in composition, temperature and reactivity, which is dictated by the interaction between the spray and the cylinder/piston walls.</p>},
  author       = {Xu, Leilei and Bai, Xue Song and Li, Yaopeng and Treacy, Mark and Li, Changle and Tunestål, Per and Tunér, Martin and Lu, Xingcai},
  issn         = {0306-2619},
  language     = {eng},
  month        = {12},
  publisher    = {Elsevier},
  series       = {Applied Energy},
  title        = {Effect of piston bowl geometry and compression ratio on in-cylinder combustion and engine performance in a gasoline direct-injection compression ignition engine under different injection conditions},
  url          = {http://dx.doi.org/10.1016/j.apenergy.2020.115920},
  doi          = {10.1016/j.apenergy.2020.115920},
  volume       = {280},
  year         = {2020},
}