Simultaneous Formaldehyde and Fuel-Tracer LIF Imaging in a High-Speed Diesel Engine With Optically Accessible Realistic Combustion Chamber 2005-24-008
Simultaneous laser-induced fluorescence (LIF) imaging of
formaldehyde and a fuel-tracer have been performed in a high-speed
diesel engine. N-heptane and isooctane were used as fuel and
toluene was used as a tracer. This arrangement made it possible to
make simultaneous measurements of toluene by exciting at 266 nm and
detecting at 270-320 nm while exciting formaldehyde at 355 nm and
detecting at 400-500 nm.
The aim of this study is to investigate how traditional fuel
tracer and natural-occurring formaldehyde formed in the cool
chemistry are transported in the piston bowl. A range of ignition
delays were created by running the engine with different amounts of
EGR. During this sweep the area where the low-temperature reactions
take place were studied.
The measurements were performed in a 0.5-l, single-cylinder
optical engine running under conditions simulating a cruise-point,
i.e., about 2.2 bar imep. The ignition delay was elongated compared
to the normal mapping and the engine-out emissions of soot and NOx
were ultra-low.
It was found that the spatial location of LTR's does not
shift significantly for different EGR levels. The formaldehyde
signal overlaps the fuel signal in most cases before the onset of
the main heat release.
Citation: Hildingsson, L., Johansson, B., Hultqvist, A., Särner, G. et al., "Simultaneous Formaldehyde and Fuel-Tracer LIF Imaging in a High-Speed Diesel Engine With Optically Accessible Realistic Combustion Chamber," SAE Technical Paper 2005-24-008, 2005, https://doi.org/10.4271/2005-24-008. Download Citation
Author(s):
Leif Hildingsson, Bengt Johansson, Anders Hultqvist, Gustaf Särner, Mattias Richter, Marcus Aldén
Affiliated:
Lund University
Pages: 17
Event:
7th International Conference on Engines for Automobile
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Diesel / compression ignition engines
Imaging and visualization
Cartography
Exhaust gas recirculation (EGR)
Pistons
Optics
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