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The Hcci Combustion Process in a Single Cycle-High-Speed Fuel Tracer Lif and Chemiluminescence Imaging

Hultqvist, Anders LU ; Christensen, Magnus LU ; Johansson, Bengt LU ; Richter, Mattias LU ; Nygren, Jenny LU ; Hult, Johan and Aldén, Marcus LU (2002) In SAE Technical Papers
Abstract
The Homogeneous Charge Compression Ignition (HCCI) combustion progress has been characterized by means of high- speed fuel tracer Planar Laser-Induced Fluorescence (PLIF) combined with simultaneous chemiluminescence imaging. Imaging has been conducted using a high-speed laser and detector system. The system can acquire a sequence of eight images within less than one crank angle. The engine was run at 1200 rpm on iso-octane or ethanol and a slight amount of acetone was added as a fuel tracer, providing a marker for the unburned areas. The PLIF sequences showed that, during the first stage of combustion, a well distributed decay of fuel concentration occurs. During the later parts of the combustion process the fuel concentration images... (More)
The Homogeneous Charge Compression Ignition (HCCI) combustion progress has been characterized by means of high- speed fuel tracer Planar Laser-Induced Fluorescence (PLIF) combined with simultaneous chemiluminescence imaging. Imaging has been conducted using a high-speed laser and detector system. The system can acquire a sequence of eight images within less than one crank angle. The engine was run at 1200 rpm on iso-octane or ethanol and a slight amount of acetone was added as a fuel tracer, providing a marker for the unburned areas. The PLIF sequences showed that, during the first stage of combustion, a well distributed decay of fuel concentration occurs. During the later parts of the combustion process the fuel concentration images present much more structure, with distinct edges between islands of unburned fuel and products. The transition between the evenly distributed fuel oxidation in the beginning and the large structures at the end, is most likely the result of a gradual amplification of small temperature inhomogeneities and an expansion of burned gas compressing the unburned. (Less)
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organization
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Contribution to specialist publication or newspaper
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published
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keywords
Combustion engines, laserdiagnostic, Combustion Physics
categories
Popular Science
in
SAE Technical Papers
language
English
LU publication?
yes
id
8a8f4c8d-71e2-49f0-b773-39b49527e6ef (old id 697411)
alternative location
http://www.sae.org/technical/papers/2002-01-0424
date added to LUP
2007-12-07 14:01:24
date last changed
2016-11-15 13:22:52
@misc{8a8f4c8d-71e2-49f0-b773-39b49527e6ef,
  abstract     = {The Homogeneous Charge Compression Ignition (HCCI) combustion progress has been characterized by means of high- speed fuel tracer Planar Laser-Induced Fluorescence (PLIF) combined with simultaneous chemiluminescence imaging. Imaging has been conducted using a high-speed laser and detector system. The system can acquire a sequence of eight images within less than one crank angle. The engine was run at 1200 rpm on iso-octane or ethanol and a slight amount of acetone was added as a fuel tracer, providing a marker for the unburned areas. The PLIF sequences showed that, during the first stage of combustion, a well distributed decay of fuel concentration occurs. During the later parts of the combustion process the fuel concentration images present much more structure, with distinct edges between islands of unburned fuel and products. The transition between the evenly distributed fuel oxidation in the beginning and the large structures at the end, is most likely the result of a gradual amplification of small temperature inhomogeneities and an expansion of burned gas compressing the unburned.},
  author       = {Hultqvist, Anders and Christensen, Magnus and Johansson, Bengt and Richter, Mattias and Nygren, Jenny and Hult, Johan and Aldén, Marcus},
  keyword      = {Combustion engines,laserdiagnostic,Combustion Physics},
  language     = {eng},
  series       = {SAE Technical Papers},
  title        = {The Hcci Combustion Process in a Single Cycle-High-Speed Fuel Tracer Lif and Chemiluminescence Imaging},
  year         = {2002},
}