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Numerical and Experimental Investigation of Turbulent Flows in a Diesel Engine

Yu, Rixin LU ; Bai, Xue-Song LU ; Hildingsson, Leif LU ; Hultqvist, Anders LU and Miles, Paul (2006) In SAE technical paper series
Abstract
This paper presents a study of the turbulence field in an optical diesel engine operated under motored conditions using both large eddy simulation (LES) and Particle Image Velocimetry (PIV). The study was performed in a laboratory optical diesel engine based on a recent production engine from VOLVO Car. PIV is used to study the flow field in the cylinder, particularly inside the piston bowl that is also optical accessible. LES is used to investigate in detail the structure of the turbulence, the vortex cores, and the temperature field in the entire engine, all within a single engine cycle. The LES results are compared with the PIV measurements in a 40 x 28 mm domain ranging from the nozzle tip to the cylinder wall. The LES grid consists of... (More)
This paper presents a study of the turbulence field in an optical diesel engine operated under motored conditions using both large eddy simulation (LES) and Particle Image Velocimetry (PIV). The study was performed in a laboratory optical diesel engine based on a recent production engine from VOLVO Car. PIV is used to study the flow field in the cylinder, particularly inside the piston bowl that is also optical accessible. LES is used to investigate in detail the structure of the turbulence, the vortex cores, and the temperature field in the entire engine, all within a single engine cycle. The LES results are compared with the PIV measurements in a 40 x 28 mm domain ranging from the nozzle tip to the cylinder wall. The LES grid consists of 1283 cells. The grid dynamically adjusts itself as the piston moves in the cylinder so that the engine cylinder, including the piston bowl, is described by the grid. In the intake phase the large-scale swirling and tumbling flow streams are shown to be responsible for the generation of large-scale vortex pipes which break down to small-scale turbulent eddies. In the later phase of compression turbulence is mainly produced in the engine bowl. The bore wall and the piston bowl wall heat the fluid near the walls. Turbulence and the large-scale coherent vortex shedding due to the Kelvin-Helmholtz instability are responsible for the enhanced heat transfer between the bulk flow and the walls. A temperature inhomogeneity of about 50 - 60 K can be generated in the cylinder. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion Engine, HCCI, Large Eddy Simulation
in
SAE technical paper series
issue
2006-01-3436
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85072440310
ISSN
0148-7191
DOI
10.4271/2006-01-3436
language
English
LU publication?
yes
id
c9440dfb-3621-484e-b5cb-c52c01dbb67d (old id 1396281)
date added to LUP
2009-05-13 12:37:43
date last changed
2019-10-06 03:56:07
@article{c9440dfb-3621-484e-b5cb-c52c01dbb67d,
  abstract     = {This paper presents a study of the turbulence field in an optical diesel engine operated under motored conditions using both large eddy simulation (LES) and Particle Image Velocimetry (PIV). The study was performed in a laboratory optical diesel engine based on a recent production engine from VOLVO Car. PIV is used to study the flow field in the cylinder, particularly inside the piston bowl that is also optical accessible. LES is used to investigate in detail the structure of the turbulence, the vortex cores, and the temperature field in the entire engine, all within a single engine cycle. The LES results are compared with the PIV measurements in a 40 x 28 mm domain ranging from the nozzle tip to the cylinder wall. The LES grid consists of 1283 cells. The grid dynamically adjusts itself as the piston moves in the cylinder so that the engine cylinder, including the piston bowl, is described by the grid. In the intake phase the large-scale swirling and tumbling flow streams are shown to be responsible for the generation of large-scale vortex pipes which break down to small-scale turbulent eddies. In the later phase of compression turbulence is mainly produced in the engine bowl. The bore wall and the piston bowl wall heat the fluid near the walls. Turbulence and the large-scale coherent vortex shedding due to the Kelvin-Helmholtz instability are responsible for the enhanced heat transfer between the bulk flow and the walls. A temperature inhomogeneity of about 50 - 60 K can be generated in the cylinder.},
  author       = {Yu, Rixin and Bai, Xue-Song and Hildingsson, Leif and Hultqvist, Anders and Miles, Paul},
  issn         = {0148-7191},
  keyword      = {Combustion Engine,HCCI,Large Eddy Simulation},
  language     = {eng},
  number       = {2006-01-3436},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE technical paper series},
  title        = {Numerical and Experimental Investigation of Turbulent Flows in a Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2006-01-3436},
  year         = {2006},
}