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Combustion Chambers for Natural Gas SI Engines Part I: Fluid Flow and Combustion

Johansson, Bengt LU and Olsson, Krister LU (1995) In SAE Transactions, Journal of Engines 104(SAE Technical Paper 950469).
Abstract
The most economical way to convert truck and bus DI-diesel engines to natural gas operation is to replace the injector with a spark plug and modify the combustion chamber in the piston crown for spark ignition operation. The modification of the piston crown should give a geometry well suited for spark ignition operation with the original swirling inlet port.



Ten different geometries were tried on a converted VOLVO TD102 engine and a remarkably large difference in the rate of combustion was noted between the chambers. To find an explanation for this difference a cycle resolved measurement of the in-cylinder mean velocity and turbulence was performed with Laser Doppler Velocimetry (LDV).



The results show... (More)
The most economical way to convert truck and bus DI-diesel engines to natural gas operation is to replace the injector with a spark plug and modify the combustion chamber in the piston crown for spark ignition operation. The modification of the piston crown should give a geometry well suited for spark ignition operation with the original swirling inlet port.



Ten different geometries were tried on a converted VOLVO TD102 engine and a remarkably large difference in the rate of combustion was noted between the chambers. To find an explanation for this difference a cycle resolved measurement of the in-cylinder mean velocity and turbulence was performed with Laser Doppler Velocimetry (LDV).



The results show a high correlation between in cylinder turbulence and rate of heat release in the main part of combustion. The very early part of combustion is more affected by other parameters but the intermediate part of combustion corresponding to 0.5-10% of the total heat released is influenced by both mean velocity and turbulence. There is a surprisingly good correlation between the average level of turbulence and the used squish area. (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
Fluid Flow, Combustion, Engine, Combustion Chamber LDV
in
SAE Transactions, Journal of Engines
volume
104
issue
SAE Technical Paper 950469
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877360988
ISSN
0096-736X
language
English
LU publication?
yes
id
8a21b0f6-74d0-4b64-a122-76df9af0234e (old id 164422)
alternative location
http://www.sae.org/technical/papers/950469
date added to LUP
2007-07-04 09:16:07
date last changed
2017-09-24 04:23:24
@article{8a21b0f6-74d0-4b64-a122-76df9af0234e,
  abstract     = {The most economical way to convert truck and bus DI-diesel engines to natural gas operation is to replace the injector with a spark plug and modify the combustion chamber in the piston crown for spark ignition operation. The modification of the piston crown should give a geometry well suited for spark ignition operation with the original swirling inlet port.<br/><br>
<br/><br>
Ten different geometries were tried on a converted VOLVO TD102 engine and a remarkably large difference in the rate of combustion was noted between the chambers. To find an explanation for this difference a cycle resolved measurement of the in-cylinder mean velocity and turbulence was performed with Laser Doppler Velocimetry (LDV).<br/><br>
<br/><br>
The results show a high correlation between in cylinder turbulence and rate of heat release in the main part of combustion. The very early part of combustion is more affected by other parameters but the intermediate part of combustion corresponding to 0.5-10% of the total heat released is influenced by both mean velocity and turbulence. There is a surprisingly good correlation between the average level of turbulence and the used squish area.},
  author       = {Johansson, Bengt and Olsson, Krister},
  issn         = {0096-736X},
  keyword      = {Fluid Flow,Combustion,Engine,Combustion Chamber LDV},
  language     = {eng},
  number       = {SAE Technical Paper 950469},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Transactions, Journal of Engines},
  title        = {Combustion Chambers for Natural Gas SI Engines Part I: Fluid Flow and Combustion},
  volume       = {104},
  year         = {1995},
}