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Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation

Egnell, Rolf LU (1998) In SAE Technical Paper Series 107.
Abstract
In this paper a combustion diagnostic method is presented

where measured pressure data is used to calculate the heat release, local temperatures and concentrations of NO and other species. This is done by a multizone model where the lambda value, i.e. 1/equivalence ratio, in each zone can be chosen arbitrarily. In homogenous charge engines lambda is given by the global air/fuel ratio. The local lambdas during initial combustion in stratified charge and diesel engines have to be estimated either as an average value or with a chosen distribution.



One new zone of each local lambda is generated and the temperature, volume and species in all old zones are updated at each time step of calculation. In this paper... (More)
In this paper a combustion diagnostic method is presented

where measured pressure data is used to calculate the heat release, local temperatures and concentrations of NO and other species. This is done by a multizone model where the lambda value, i.e. 1/equivalence ratio, in each zone can be chosen arbitrarily. In homogenous charge engines lambda is given by the global air/fuel ratio. The local lambdas during initial combustion in stratified charge and diesel engines have to be estimated either as an average value or with a chosen distribution.



One new zone of each local lambda is generated and the temperature, volume and species in all old zones are updated at each time step of calculation. In this paper the

model is demonstrated by using pressure data from premixed

and direct injected stratified charge natural gas SI engines and from a DI diesel engine.



The pre-mixed data is used to validate the model as such

while the ambition in the stratified charge and diesel

cases has been to find the average local lambda that gives the same NOx emission as measured. The emphasis in the latter cases has been to study the influence on average local lambda of the duration of the fuel injection. Early injected fuel seems to burn at slightly leaner mixtures

than later injected. (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
Multi Zone, NO, Heat Release, Cylinder Pressure, Combustion, Engine
in
SAE Technical Paper Series
volume
107
publisher
Society of Automotive Engineers
external identifiers
  • scopus:84877207228
ISSN
0148-7191
language
English
LU publication?
yes
id
2a34c62f-05de-486c-85de-3b8d3e5f934e (old id 164564)
alternative location
http://www.sae.org/technical/papers/981424
date added to LUP
2007-06-28 09:02:31
date last changed
2017-09-10 04:28:16
@article{2a34c62f-05de-486c-85de-3b8d3e5f934e,
  abstract     = {In this paper a combustion diagnostic method is presented<br/><br>
where measured pressure data is used to calculate the heat release, local temperatures and concentrations of NO and other species. This is done by a multizone model where the lambda value, i.e. 1/equivalence ratio, in each zone can be chosen arbitrarily. In homogenous charge engines lambda is given by the global air/fuel ratio. The local lambdas during initial combustion in stratified charge and diesel engines have to be estimated either as an average value or with a chosen distribution.<br/><br>
<br/><br>
One new zone of each local lambda is generated and the temperature, volume and species in all old zones are updated at each time step of calculation. In this paper the<br/><br>
model is demonstrated by using pressure data from premixed<br/><br>
and direct injected stratified charge natural gas SI engines and from a DI diesel engine.<br/><br>
<br/><br>
The pre-mixed data is used to validate the model as such<br/><br>
while the ambition in the stratified charge and diesel<br/><br>
cases has been to find the average local lambda that gives the same NOx emission as measured. The emphasis in the latter cases has been to study the influence on average local lambda of the duration of the fuel injection. Early injected fuel seems to burn at slightly leaner mixtures<br/><br>
than later injected.},
  author       = {Egnell, Rolf},
  issn         = {0148-7191},
  keyword      = {Multi Zone,NO,Heat Release,Cylinder Pressure,Combustion,Engine},
  language     = {eng},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Technical Paper Series},
  title        = {Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation},
  volume       = {107},
  year         = {1998},
}