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Influence of direct electric field on the knock intensity in a spark-igntion engine
Technical Paper
2000-05-0158
Sector:
Language:
English
Abstract
In order to investigate the effects of a DC electric field and
its polarity on the knock intensity in a spark-ignition engine, an
experimental study was carried out with a rapid compression
machine. To get a good understanding of the effect of an electric
field on knocking combustion, the high-speed direct photographs
were taken. The ionization current measurements were also carried
out using the electrode as an ionization probe
The major findings of present investigation of the effects of DC
electric fields on the knocking combustion process in a
spark-ignition engine could be summarized as follows:
It was clearly indicated that the knock intensity decreases with
the increase of the electric field regardless its polarity. The
knock intensity was strongly dependent upon the burned mass
fraction at the onset of the end-gas autoignition, and decreased as
the burned mass fraction increased. It was found that the electric
field causes the increase of the flame propagation speed, but even
in the case of the longest electrode, L-electrode, the increase in
the burned mass fraction is not so much. It was also observed that
the reduction rate of the knock intensity depends upon the
ionization currents.
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