Influence of the Velocity Near the Spark Plug on Early Flame Development
Author
Summary, in English
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.
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.
Department/s
Publishing year
1993
Language
English
Publication/Series
SAE Technical Paper Series
Full text
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Document type
Conference paper
Publisher
Society of Automotive Engineers
Topic
- Other Mechanical Engineering
Keywords
- cycle-cycle variation
- combustion engine
- LDV
- velocity measurement
Conference name
SAE International Congress and Exposition
Conference date
0001-01-02
Status
Published
ISBN/ISSN/Other
- ISSN: 0148-7191