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Heat Loss Analysis for Various Piston Geometries in a Heavy-Duty Methanol PPC Engine

Pucilowski, Mateusz LU ; Jangi, Mehdi LU ; Shamun, Sam LU ; Tuner, Martin LU and Bai, Xue Song LU (2018) SAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018 In SAE Technical Papers 2018-September.
Abstract

Partially premixed combustion (PPC) in internal combustion engine as a low temperature combustion strategy has shown great potential to achieve high thermodynamic efficiency. Methanol due to its unique properties is considered as a preferable PPC engine fuel. The injection timing to achieve methanol PPC conditions should be set very close to TDC, allowing to utilize spray-bowl interaction to further improve combustion process in terms of emissions and heat losses. In this study CFD simulations are performed to investigate spray-bowl interaction for a number of different piston designs and its impact on the heat transfer and the overall piston performance. The validation case is based on a single cylinder heavy-duty Scania D13 engine... (More)

Partially premixed combustion (PPC) in internal combustion engine as a low temperature combustion strategy has shown great potential to achieve high thermodynamic efficiency. Methanol due to its unique properties is considered as a preferable PPC engine fuel. The injection timing to achieve methanol PPC conditions should be set very close to TDC, allowing to utilize spray-bowl interaction to further improve combustion process in terms of emissions and heat losses. In this study CFD simulations are performed to investigate spray-bowl interaction for a number of different piston designs and its impact on the heat transfer and the overall piston performance. The validation case is based on a single cylinder heavy-duty Scania D13 engine with a compression ratio 15. The operation point is set to low load 5.42 IMEPg bar with SOI -3 aTDC. After satisfactory agreement with experiments in terms of combustion phasing, in-cylinder pressure and heat release rate, the effect of piston bowl geometry is investigated by performing several CFD simulations with modified piston bowl geometry while keeping the compression ratio, CA50 and injection conditions the same as the baseline case. The influence of the wall temperature gradient, the near wall effective conductivity and the piston bowl area on the heat transfer is studied. It was observed that the flow structures that re-direct the hot vapor away from the in-cylinder walls will reduce the wall area that actively transfer the heat. The final piston performance comparison showed that piston bowl designs with a reduced area to volume ratio does not guarantee lower heat loss. Therefore, the mixing process as the result of the spray-bowl interaction and the resulting fuel distribution are considered as the main mechanisms to minimize the total heat losses.

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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
host publication
SAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018
series title
SAE Technical Papers
volume
2018-September
publisher
SAE
conference name
SAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018
conference location
Heidelberg, Germany
conference dates
2018-09-17 - 2018-09-19
external identifiers
  • scopus:85056858375
ISSN
0148-7191
DOI
10.4271/2018-01-1726
language
English
LU publication?
yes
id
008773ef-cab7-472b-97d1-720e4873587a
date added to LUP
2018-11-29 14:32:24
date last changed
2019-02-20 11:38:25
@inproceedings{008773ef-cab7-472b-97d1-720e4873587a,
  abstract     = {<p>Partially premixed combustion (PPC) in internal combustion engine as a low temperature combustion strategy has shown great potential to achieve high thermodynamic efficiency. Methanol due to its unique properties is considered as a preferable PPC engine fuel. The injection timing to achieve methanol PPC conditions should be set very close to TDC, allowing to utilize spray-bowl interaction to further improve combustion process in terms of emissions and heat losses. In this study CFD simulations are performed to investigate spray-bowl interaction for a number of different piston designs and its impact on the heat transfer and the overall piston performance. The validation case is based on a single cylinder heavy-duty Scania D13 engine with a compression ratio 15. The operation point is set to low load 5.42 IMEPg bar with SOI -3 aTDC. After satisfactory agreement with experiments in terms of combustion phasing, in-cylinder pressure and heat release rate, the effect of piston bowl geometry is investigated by performing several CFD simulations with modified piston bowl geometry while keeping the compression ratio, CA50 and injection conditions the same as the baseline case. The influence of the wall temperature gradient, the near wall effective conductivity and the piston bowl area on the heat transfer is studied. It was observed that the flow structures that re-direct the hot vapor away from the in-cylinder walls will reduce the wall area that actively transfer the heat. The final piston performance comparison showed that piston bowl designs with a reduced area to volume ratio does not guarantee lower heat loss. Therefore, the mixing process as the result of the spray-bowl interaction and the resulting fuel distribution are considered as the main mechanisms to minimize the total heat losses.</p>},
  author       = {Pucilowski, Mateusz and Jangi, Mehdi and Shamun, Sam and Tuner, Martin and Bai, Xue Song},
  booktitle    = {SAE Technical Papers},
  issn         = {0148-7191},
  language     = {eng},
  location     = {Heidelberg, Germany},
  publisher    = {SAE},
  title        = {Heat Loss Analysis for Various Piston Geometries in a Heavy-Duty Methanol PPC Engine},
  url          = {http://dx.doi.org/10.4271/2018-01-1726},
  volume       = {2018-September},
  year         = {2018},
}