Influence of the Velocity Near the Spark Plug on Early Flame Development

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


The objective of this paper is to investigate how the
velocity and turbulence within different locations close to
the spark plug influence the combustion at individual
cycles in a SI-engine.
2-D cycle-resolved laser doppler velocimetry
(LDV) measurements have been done both inside the spark
gap and around the spark tip to extract velocity
information. The pressure in the cylinder was measured
with a piezo-electric transducer connected to an A/D-card
in a standard PC.
The velocity information was filtered to get "mean
velocity" and "turbulence". The pressure signal was used
in a one-zone heatrelease model to get different levels of
mass fraction burned etc.
The results show a significant influence of both the
"mean velocity" and the "turbulence" on the early part of
the combustion when the velocity was measured close to
the spark plug tip. The influence was less significant when
the velocity was measured at some distance from the
electrodes for both a pancake and a high squish
combustion chamber. The correlation between the velocity
close to the spark plug and the early flame development
showed no dependence on the air-fuel ratio and a modest
dependence on ignition timing.


  • Bengt Johansson
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering


  • cycle-cycle variation, combustion engine, LDV, velocity measurement
Original languageEnglish
Title of host publicationSAE Technical Paper Series
PublisherSociety of Automotive Engineers
Publication statusPublished - 1993
Publication categoryResearch
EventSAE International Congress and Exposition - Detroit, Michigan
Duration: 0001 Jan 2 → …

Publication series

ISSN (Print)0148-7191


ConferenceSAE International Congress and Exposition
Period0001/01/02 → …

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