Advanced

Development and demonstration of 2D-LIF for studies of mixture preparation in SI engines

Neij, Hans; Johansson, Bengt LU and Aldén, Marcus LU (1994) In Combustion and Flame 99(2). p.449-457
Abstract
Laser-induced fluorescence (LIF) has been developed for visualization of fuel distribution fields in an operating spark-ignition (SI) engine. Since the standard research fuel iso-octane, does not yield a useful LIF signal a fluorescent additive was used. None of the commonly used seeds were found adequate. A seed not commonly used in this context, 3-pentanone, C2H5COC2H5, was chosen due to favorable vaporization characteristics and fluorescent properties. Results from preparatory investigations in the actual engine environment are presented and related laboratory data are discussed. The two-dimensional LIF technique was applied to a spark-ignition engine and the fuel distribution at the ignition time was recorded. The resulting images were... (More)
Laser-induced fluorescence (LIF) has been developed for visualization of fuel distribution fields in an operating spark-ignition (SI) engine. Since the standard research fuel iso-octane, does not yield a useful LIF signal a fluorescent additive was used. None of the commonly used seeds were found adequate. A seed not commonly used in this context, 3-pentanone, C2H5COC2H5, was chosen due to favorable vaporization characteristics and fluorescent properties. Results from preparatory investigations in the actual engine environment are presented and related laboratory data are discussed. The two-dimensional LIF technique was applied to a spark-ignition engine and the fuel distribution at the ignition time was recorded. The resulting images were processed and converted into fuel/air equivalence ratio using an in situ calibration technique. The processed fuel distribution maps presented a noise level of 10% and a systematic error not exceeding 0.03 fuel/air equivalence units. An increased combustion variability was observed when changing from a homogeneous to an inhomogeneous fuel/air mixture. Correlations of image data to the combustion development indicated that the increased cyclic variability could be largely explained by variations in the mean fuel concentration around the spark gap. The initial flame development therefore seems to be controlled by the average amount of fuel near the spark gap, whereas the actual distribution of the fuel within this volume is of less importance. (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
2D, SI Engine, Combustion Engine, Laser Induced Fluorescence
in
Combustion and Flame
volume
99
issue
2
pages
449 - 457
publisher
Elsevier
external identifiers
  • scopus:0028534171
ISSN
0010-2180
DOI
10.1016/0010-2180(94)90152-X
language
English
LU publication?
yes
id
10a04fe2-6985-44dc-b65d-2889632c7229 (old id 574907)
date added to LUP
2007-11-05 14:49:39
date last changed
2017-08-06 04:42:53
@article{10a04fe2-6985-44dc-b65d-2889632c7229,
  abstract     = {Laser-induced fluorescence (LIF) has been developed for visualization of fuel distribution fields in an operating spark-ignition (SI) engine. Since the standard research fuel iso-octane, does not yield a useful LIF signal a fluorescent additive was used. None of the commonly used seeds were found adequate. A seed not commonly used in this context, 3-pentanone, C2H5COC2H5, was chosen due to favorable vaporization characteristics and fluorescent properties. Results from preparatory investigations in the actual engine environment are presented and related laboratory data are discussed. The two-dimensional LIF technique was applied to a spark-ignition engine and the fuel distribution at the ignition time was recorded. The resulting images were processed and converted into fuel/air equivalence ratio using an in situ calibration technique. The processed fuel distribution maps presented a noise level of 10% and a systematic error not exceeding 0.03 fuel/air equivalence units. An increased combustion variability was observed when changing from a homogeneous to an inhomogeneous fuel/air mixture. Correlations of image data to the combustion development indicated that the increased cyclic variability could be largely explained by variations in the mean fuel concentration around the spark gap. The initial flame development therefore seems to be controlled by the average amount of fuel near the spark gap, whereas the actual distribution of the fuel within this volume is of less importance.},
  author       = {Neij, Hans and Johansson, Bengt and Aldén, Marcus},
  issn         = {0010-2180},
  keyword      = {2D,SI Engine,Combustion Engine,Laser Induced Fluorescence},
  language     = {eng},
  number       = {2},
  pages        = {449--457},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Development and demonstration of 2D-LIF for studies of mixture preparation in SI engines},
  url          = {http://dx.doi.org/10.1016/0010-2180(94)90152-X},
  volume       = {99},
  year         = {1994},
}