http://www.cnr.it/ontology/cnr/individuo/prodotto/ID66129
Optical investigation of premixed low-temperature combustion of lighter fuel blends in compression ignition engines (Articolo in rivista)
- Type
- Label
- Optical investigation of premixed low-temperature combustion of lighter fuel blends in compression ignition engines (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.4271/2011-24-0045 (literal)
- Alternative label
Esposito Corcione F., Valentino G., Tornatore C., Merola S., Marchitto L. (2011)
Optical investigation of premixed low-temperature combustion of lighter fuel blends in compression ignition engines
in SAE technical paper series; SAE International, Warrendale (Stati Uniti d'America)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Esposito Corcione F., Valentino G., Tornatore C., Merola S., Marchitto L. (literal)
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
- SAE Paper 2011-24-0045 (ISSN 0148-7191). (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto Motori, CNR, Napoli. (literal)
- Titolo
- Optical investigation of premixed low-temperature combustion of lighter fuel blends in compression ignition engines (literal)
- Abstract
- Optical imaging and UV-visible detection of in-cylinder
combustion phenomena were made in a single cylinder
optically accessed high swirl multi-jets compression ignition
engine operating with two different fuels and two EGR
levels. A commercial diesel fuel and a lighter fuel blend of
diesel (80%) and gasoline (20%), named G20, were tested for
two injection pressures (70 and 140 MPa) and injection
timings in the range 11 CAD BTDC to 5 CAD ATDC. The
blend G20 has a lower cetane number, is more volatile and
more resistant to the auto-ignition than diesel yielding an
effect on the ignition delay and on the combustion
performance. Instantaneous fuel injection rate, in-cylinder
combustion pressure, NOx and smoke engine out emissions
were measured. Taking into account the particular
configuration of the engine, the efficiency was estimated by
determining the area under the working engine cycle.
Moreover, it is also known that the diffusion flame lift-off
length strongly influences the soot formation, which is
affected by in-cylinder gas density, air swirl and jet to jet
interaction. To understand the role played by these factors on
lift-off length and soot formation, images of UV-VIS
chemiluminescence were used to measure the diffusion flame
lift-off length. The results demonstrate as the G20 fuel blend,
at late injection timing and high EGR (50%), increases the
ignition delay, allowing to operate, at late injection timing, in
a partially premixed low temperature combustion (PPLTC)
regime in which the fuel is completely injected before the
start of combustion. In this regime, strong reduction of engine
out emissions of smoke and NOx were obtained with a
penalty on engine efficiency. This limitation was overcome
operating at earlier injection timing (11 CAD BTDC) in
which a mixing controlled low temperature combustion
(MCC) LTC regime was realized. In this regime, a good
compromise between low engine out emissions and
efficiency was made possible. Finally, images of UV-VIS
chemiluminescence were also used to measure the flame liftoff
length, defined as the distance between the injector orifice
and the most upstream location of flame chemiluminescence
on the fuel jet. Flame lift-off data were plotted versus the
visible emission intensity at 532 nm, representative of soot
emission. It was observed that, for all engine test conditions
an increase of lift-off length corresponded to a decrease of incylinder
soot production. (literal)
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