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Cycle-To-Cycle Variations in S.I. Engines--The Effects of Fluid Flow and Gas Composition in the Vicinity of the Spark Plug on Early Combustion

Johansson, Bengt LU (1996) In SAE Transactions, Journal of Engines 105(SAE Technical Paper 962084).
Abstract
Simultaneous measurements of early flame speed and local measurements of the major parameters controlling the process are presented. The early flame growth rate was captured with heat release analysis of the cylinder pressure. The local concentration of fuel or residual gas were measured with laser induced fluorescence (LIF) on isooctane/3-pentanone or water. Local velocity measurements were performed with laser doppler velocimetry (LDV).



The results show a significant cycle to cycle correlation between early flame growth rate and several parameters. The experiments were arranged to suppress all but one important factor at a time. When the engine was run without fuel or residual gas fluctuations, the cycle to cycle... (More)
Simultaneous measurements of early flame speed and local measurements of the major parameters controlling the process are presented. The early flame growth rate was captured with heat release analysis of the cylinder pressure. The local concentration of fuel or residual gas were measured with laser induced fluorescence (LIF) on isooctane/3-pentanone or water. Local velocity measurements were performed with laser doppler velocimetry (LDV).



The results show a significant cycle to cycle correlation between early flame growth rate and several parameters. The experiments were arranged to suppress all but one important factor at a time. When the engine was run without fuel or residual gas fluctuations, the cycle to cycle variations of turbulence were able to explain 50 % of the flame growth rate fluctuations. With a significantly increased fluctuation of F/A, obtained with port fuelling, 65% of the growth rate fluctuation could be explained with local F/A measurements. With a homogeneous fuel/air-mixture but with a high concentration of residual, a correlation could be obtained between local residual concentration and combustion. (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
Spark Plug, Cycle-Cycle Variations, Combustion, Engine, Fluid Flow
in
SAE Transactions, Journal of Engines
volume
105
issue
SAE Technical Paper 962084
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877190983
ISSN
0096-736X
language
English
LU publication?
yes
id
9586b121-d326-474d-b2cf-e0351dd67945 (old id 164442)
alternative location
http://www.sae.org/technical/papers/962084
date added to LUP
2007-07-04 09:14:48
date last changed
2017-06-11 04:37:31
@article{9586b121-d326-474d-b2cf-e0351dd67945,
  abstract     = {Simultaneous measurements of early flame speed and local measurements of the major parameters controlling the process are presented. The early flame growth rate was captured with heat release analysis of the cylinder pressure. The local concentration of fuel or residual gas were measured with laser induced fluorescence (LIF) on isooctane/3-pentanone or water. Local velocity measurements were performed with laser doppler velocimetry (LDV).<br/><br>
<br/><br>
The results show a significant cycle to cycle correlation between early flame growth rate and several parameters. The experiments were arranged to suppress all but one important factor at a time. When the engine was run without fuel or residual gas fluctuations, the cycle to cycle variations of turbulence were able to explain 50 % of the flame growth rate fluctuations. With a significantly increased fluctuation of F/A, obtained with port fuelling, 65% of the growth rate fluctuation could be explained with local F/A measurements. With a homogeneous fuel/air-mixture but with a high concentration of residual, a correlation could be obtained between local residual concentration and combustion.},
  author       = {Johansson, Bengt},
  issn         = {0096-736X},
  keyword      = {Spark Plug,Cycle-Cycle Variations,Combustion,Engine,Fluid Flow},
  language     = {eng},
  number       = {SAE Technical Paper 962084},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Cycle-To-Cycle Variations in S.I. Engines--The Effects of Fluid Flow and Gas Composition in the Vicinity of the Spark Plug on Early Combustion},
  volume       = {105},
  year         = {1996},
}