Date of Award

Summer 2019

Document Type


Degree Name

Master of Science (MS)


Mechanical Engineering

First Advisor

Roy, Somesh P.

Second Advisor

Singer, Simcha

Third Advisor

Borg, John


Soot formation is a complex process and the actual soot formation methodology is still a mystery. Numerically modeling of soot requires successful coupling of turbulence, chemistry and radiation modeling. In the present study, a comprehensive sensitivity study is conducted to see the effect of radiation and exhaust gas recirculation (EGR) on soot and NOX formation in a high pressure spray combustion scenario. The spray-A case (n-dodecane as fuel) from Engine Combustion Network (ECN) is used as the target condition. Two different soot modeling approaches have been considered: a semi-empirical two-equation model and a method of moments with interpolative closure (MOMIC). A multiphase photon Monte Carlo (PMC) solver with line-by-line (LBL) spectral database is used to resolve radiative heat transfer. Results show that, effect of radiation on soot is minimal in spray-A configuration. Inclusion of radiation modeling, on the other hand, marginally reduce NO prediction. Both peak soot and NO formation increases with O2 content in EGR. Oxygen content of EGR is found to have significant effect on soot sizes as the mean soot diameter increases along with considerable widening of the diameter distribution with the increase of O2 percentage.

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Engineering Commons