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The influence of fuel injection and heat release on bulk flow structures in a direct-injection, swirl-supported diesel engine

Miles, Paul C ; Hildingsson, Leif LU and Hultqvist, Anders LU (2007) In Experiments in Fluids 43(2-3). p.273-283
Abstract
Particle image velocimetry is applied to measure the vertical (r-z) plane flow structures in a light-duty direct-injection diesel engine with a realistic piston geometry. The measurements are corrected for optical distortions due to the curved piston bowl walls and the cylindrical liner. Mean flow fields are presented and contrasted for operation both with and without fuel injection and combustion. For operation with combustion, the two-dimensional divergence of the measured mean velocity fields is employed as a qualitative indicator of the locations of mean heat release. In agreement with numerical simulations, dual-vortex, vertical plane mean flow structures that may enhance mixing rates are formed approximately mid-way through the... (More)
Particle image velocimetry is applied to measure the vertical (r-z) plane flow structures in a light-duty direct-injection diesel engine with a realistic piston geometry. The measurements are corrected for optical distortions due to the curved piston bowl walls and the cylindrical liner. Mean flow fields are presented and contrasted for operation both with and without fuel injection and combustion. For operation with combustion, the two-dimensional divergence of the measured mean velocity fields is employed as a qualitative indicator of the locations of mean heat release. In agreement with numerical simulations, dual-vortex, vertical plane mean flow structures that may enhance mixing rates are formed approximately mid-way through the combustion event. Late in the cycle a toroidal vortex forms outside the bowl mouth. Imaging studies suggest that soot and partially oxidized fuel trapped within this vortex are slow to mix with surrounding fluid; moreover, the vortex impedes mixing of fluid exiting the bowl with air within the squish volume. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Experiments in Fluids
volume
43
issue
2-3
pages
273 - 283
publisher
Springer
external identifiers
  • wos:000248894500013
  • scopus:34548104153
ISSN
1432-1114
DOI
10.1007/s00348-007-0281-7
language
English
LU publication?
yes
id
a2c54993-9007-4397-b309-d30a02cd55c7 (old id 691978)
date added to LUP
2016-04-01 12:04:00
date last changed
2022-01-26 22:18:29
@article{a2c54993-9007-4397-b309-d30a02cd55c7,
  abstract     = {{Particle image velocimetry is applied to measure the vertical (r-z) plane flow structures in a light-duty direct-injection diesel engine with a realistic piston geometry. The measurements are corrected for optical distortions due to the curved piston bowl walls and the cylindrical liner. Mean flow fields are presented and contrasted for operation both with and without fuel injection and combustion. For operation with combustion, the two-dimensional divergence of the measured mean velocity fields is employed as a qualitative indicator of the locations of mean heat release. In agreement with numerical simulations, dual-vortex, vertical plane mean flow structures that may enhance mixing rates are formed approximately mid-way through the combustion event. Late in the cycle a toroidal vortex forms outside the bowl mouth. Imaging studies suggest that soot and partially oxidized fuel trapped within this vortex are slow to mix with surrounding fluid; moreover, the vortex impedes mixing of fluid exiting the bowl with air within the squish volume.}},
  author       = {{Miles, Paul C and Hildingsson, Leif and Hultqvist, Anders}},
  issn         = {{1432-1114}},
  language     = {{eng}},
  number       = {{2-3}},
  pages        = {{273--283}},
  publisher    = {{Springer}},
  series       = {{Experiments in Fluids}},
  title        = {{The influence of fuel injection and heat release on bulk flow structures in a direct-injection, swirl-supported diesel engine}},
  url          = {{http://dx.doi.org/10.1007/s00348-007-0281-7}},
  doi          = {{10.1007/s00348-007-0281-7}},
  volume       = {{43}},
  year         = {{2007}},
}