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Effect of Piston Shape and Swirl Ratio on Engine Heat Transfer in a Light-Duty Diesel Engine

Fridriksson, Helgi LU ; Tunér, Martin LU ; Andersson, Öivind LU ; Sundén, Bengt LU ; Persson, Håkan and Ljungqvist, Mattias (2014) SAE 2014 World Congress & Exhibition In SAE Technical Papers
Abstract
Heat transfer losses are one of the largest loss contributions in a modern internal combustion engine. The aim of this study is to evaluate the contribution of the piston bowl type and swirl ratio to heat losses and performance. A commercial CFD tool is used to carry out simulations of four different piston bowl geometries, at three engine loads with two different swirl ratios at each load point. One of the geometries is used as a reference point, where CFD results are validated with engine test data. All other bowl geometries are scaled to the same compression ratio and make use of the same fuel injection, with a variation in the spray target between cases. The results show that the baseline case, which is of a conventional diesel bowl... (More)
Heat transfer losses are one of the largest loss contributions in a modern internal combustion engine. The aim of this study is to evaluate the contribution of the piston bowl type and swirl ratio to heat losses and performance. A commercial CFD tool is used to carry out simulations of four different piston bowl geometries, at three engine loads with two different swirl ratios at each load point. One of the geometries is used as a reference point, where CFD results are validated with engine test data. All other bowl geometries are scaled to the same compression ratio and make use of the same fuel injection, with a variation in the spray target between cases. The results show that the baseline case, which is of a conventional diesel bowl shape, provides the best emission performance, while a more open, tapered, lip-less combustion bowl is the most thermodynamically efficient. The results also show that the effects of swirl are not consequent throughout all piston geometries, as the flow field response to swirl variations is different in the various piston geometries. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
submitted
subject
keywords
Swirl ratio, Piston shape, Diesel Engine, Heat Transfer, CFD
in
SAE Technical Papers
pages
11 pages
publisher
SAE
conference name
SAE 2014 World Congress & Exhibition
external identifiers
  • Scopus:84899542791
DOI
10.4271/2014-01-1141
language
English
LU publication?
yes
id
2a1937a0-e9cb-4cf6-8e90-8f5bf8226b65 (old id 4172754)
date added to LUP
2013-11-21 11:49:48
date last changed
2017-01-01 07:57:37
@inproceedings{2a1937a0-e9cb-4cf6-8e90-8f5bf8226b65,
  abstract     = {Heat transfer losses are one of the largest loss contributions in a modern internal combustion engine. The aim of this study is to evaluate the contribution of the piston bowl type and swirl ratio to heat losses and performance. A commercial CFD tool is used to carry out simulations of four different piston bowl geometries, at three engine loads with two different swirl ratios at each load point. One of the geometries is used as a reference point, where CFD results are validated with engine test data. All other bowl geometries are scaled to the same compression ratio and make use of the same fuel injection, with a variation in the spray target between cases. The results show that the baseline case, which is of a conventional diesel bowl shape, provides the best emission performance, while a more open, tapered, lip-less combustion bowl is the most thermodynamically efficient. The results also show that the effects of swirl are not consequent throughout all piston geometries, as the flow field response to swirl variations is different in the various piston geometries.},
  author       = {Fridriksson, Helgi and Tunér, Martin and Andersson, Öivind and Sundén, Bengt and Persson, Håkan and Ljungqvist, Mattias},
  booktitle    = {SAE Technical Papers},
  keyword      = {Swirl ratio,Piston shape,Diesel Engine,Heat Transfer,CFD},
  language     = {eng},
  pages        = {11},
  publisher    = {SAE},
  title        = {Effect of Piston Shape and Swirl Ratio on Engine Heat Transfer in a Light-Duty Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2014-01-1141},
  year         = {2014},
}