Title page for ETD etd-583512259711521

Type of Document Master's Thesis
Author Faison, Inga L.
Author's Email Address ifaison@vt.edu
URN etd-583512259711521
Title The Effect of Ozone on Diesel Soot Precursors
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kornhauser, Alan A.
Vandsburger, Uri
Ganeshan, Balakrishnan Committee Chair
  • soot precursors
  • diesel engine
  • combustion
  • ozone
Date of Defense 1997-04-23
Availability unrestricted
A joint experimental and numerical project

has been initiated at Virginia Tech to study the

effect of ozone on diesel soot precursors. This

thesis is the first stage of the numerical part of

the project, and contains a study of the effect

of the different ozone levels on diesel soot


This numerical study is executed via the use of

two computer programs, Senkin, and PSR.

An idealistic model of the diesel engine was

used in both analyses. The numerical studies

were done at three different engine speeds,

1500, 2000, 2500 RPM and eight different

levels of ozone. Studies were performed with

ozone introduced with the intake air and with

the fuel. Eleven product species, which

include dominant soot precursors such as

acetylene (C2H2) and the propargyl radical

(C3H3), were examined and evaluated during

this experiment.

After analyzing both simulations, the PSR

predictions were not useful since it omits the

existence of temperature and species

gradients. The PSR analysis was used as a

preliminary model to get an overall idea of

combustion pollutant formation and predicted

the exit soot precursor concentrations were

unaffected by any ozone addition. However,

the Senkin analysis predicted the ozone

injection did have the potential to reduce the

formation of soot precursors. The Senkin

analysis predicted more realistic results and

therefore it is believed to yield the correct

conclusion. However, it was suggested that an

additional program, such as KIVA3, be

utilized to predict a more practical view of the

chemical kinetic behavior of ozone and its

effect on the diesel engine.

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