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Study on Combustion Chamber Geometry Effects in an HCCI Engine using High-Speed Cycle-Resolved Chemiluminescence Imaging

Vressner, Andreas LU ; Hultqvist, Anders LU and Johansson, Bengt LU (2007) In SAE Technical Paper Series
Abstract
The aim of this study is to see how geometry generated

turbulence affects the Rate of Heat Release (ROHR) in

an HCCI engine. HCCI combustion is limited in load due

to high peak pressures and too fast combustion. If the

speed of combustion can be decreased the load range

can be extended. Therefore two different combustion

chamber geometries were investigated, one with a disc

shape and one with a square bowl in piston. The later

one provokes squish-generated gas flow into the bowl

causing turbulence. The disc shaped combustion

chamber was used as a reference case. Combustion

duration and ROHR were studied using heat release

analysis. A... (More)
The aim of this study is to see how geometry generated

turbulence affects the Rate of Heat Release (ROHR) in

an HCCI engine. HCCI combustion is limited in load due

to high peak pressures and too fast combustion. If the

speed of combustion can be decreased the load range

can be extended. Therefore two different combustion

chamber geometries were investigated, one with a disc

shape and one with a square bowl in piston. The later

one provokes squish-generated gas flow into the bowl

causing turbulence. The disc shaped combustion

chamber was used as a reference case. Combustion

duration and ROHR were studied using heat release

analysis. A Scania D12 Diesel engine, converted to port

injected HCCI with ethanol was used for the

experiments. An engine speed of 1200 rpm was applied

throughout the tests. The effect of air/fuel ratio and

combustion phasing was also studied. The behavior of

the heat release was correlated with high speed

chemiluminescence imaging for both combustion

chamber geometries. Optical access was enabled from

beneath by a quartz piston and a 45 degree mirror. It

was found that the square bowl in piston generates

higher turbulence levels resulting in half the ROHR and

twice as long combustion duration as the disc shaped

combustion chamber. By using a resolution of 3 images

per CAD, the fast gas movements during the entire

HCCI combustion process could be studied inside the

bowl. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Working Paper
publication status
published
subject
keywords
combustion chamber geometry, Chemiluminescence, HCCI, Engine
in
SAE Technical Paper Series
external identifiers
  • scopus:84877211292
language
English
LU publication?
yes
id
1bde1ba1-b934-44d9-8346-fce838798354 (old id 538891)
alternative location
http://www.sae.org/technical/papers/2007-01-0217
date added to LUP
2007-09-28 07:37:45
date last changed
2017-04-16 04:32:16
@misc{1bde1ba1-b934-44d9-8346-fce838798354,
  abstract     = {The aim of this study is to see how geometry generated<br/><br>
turbulence affects the Rate of Heat Release (ROHR) in<br/><br>
an HCCI engine. HCCI combustion is limited in load due<br/><br>
to high peak pressures and too fast combustion. If the<br/><br>
speed of combustion can be decreased the load range<br/><br>
can be extended. Therefore two different combustion<br/><br>
chamber geometries were investigated, one with a disc<br/><br>
shape and one with a square bowl in piston. The later<br/><br>
one provokes squish-generated gas flow into the bowl<br/><br>
causing turbulence. The disc shaped combustion<br/><br>
chamber was used as a reference case. Combustion<br/><br>
duration and ROHR were studied using heat release<br/><br>
analysis. A Scania D12 Diesel engine, converted to port<br/><br>
injected HCCI with ethanol was used for the<br/><br>
experiments. An engine speed of 1200 rpm was applied<br/><br>
throughout the tests. The effect of air/fuel ratio and<br/><br>
combustion phasing was also studied. The behavior of<br/><br>
the heat release was correlated with high speed<br/><br>
chemiluminescence imaging for both combustion<br/><br>
chamber geometries. Optical access was enabled from<br/><br>
beneath by a quartz piston and a 45 degree mirror. It<br/><br>
was found that the square bowl in piston generates<br/><br>
higher turbulence levels resulting in half the ROHR and<br/><br>
twice as long combustion duration as the disc shaped<br/><br>
combustion chamber. By using a resolution of 3 images<br/><br>
per CAD, the fast gas movements during the entire<br/><br>
HCCI combustion process could be studied inside the<br/><br>
bowl.},
  author       = {Vressner, Andreas and Hultqvist, Anders and Johansson, Bengt},
  keyword      = {combustion chamber geometry,Chemiluminescence,HCCI,Engine},
  language     = {eng},
  note         = {Working Paper},
  series       = {SAE Technical Paper Series},
  title        = {Study on Combustion Chamber Geometry Effects in an HCCI Engine using High-Speed Cycle-Resolved Chemiluminescence Imaging},
  year         = {2007},
}