A study on the distribution of soot in cylinder of an optically accessible diesel engine using laser sheet 2000-05-0334
In order to clarify the characteristics of soot formation and
oxidation in cylinder of diesel engine, it is necessary to diagnose
accurately for combustion of in-cylinder. The past techniques for
soot measurement have limitations in providing the characteristics
of soot in a diesel engine, whereas, laser-based 2D imaging
diagnostics have the potential to provide better temporally and
spatially resolved measurements of the soot distribution.
The technique using laser sheet beam has been applied to an
optically accessible diesel engine for the quantitative measurement
of soot. The results provide the information for reduction of soot
from diesel engine. We used both LIS and LII techniques
simultaneously in this study. The images of LIS and LII show the
quantitative distribution of the soot concentration in an optically
accessible diesel engine. In this study, several results were
obtained by the simultaneous measurement of LIS and LII techniques.
The diameter and number density of soot in combustion chamber of
the test engine were obtained from ATDC 20 degrees to 110 degrees.
The increase rate of soot diameter was about 40% between ATDC 20
degrees and 110 degrees. And the number density of soot decreased
significantly between ATDC 40 degrees and 70 degrees.