Three-Dimensional Modeling of Soot and NO in a Direct-injection Diesel Engine

Paper #:
  • 950608

Published:
  • 1995-02-01
Citation:
Hou, Z. and Abraham, J., "Three-Dimensional Modeling of Soot and NO in a Direct-injection Diesel Engine," SAE Technical Paper 950608, 1995, https://doi.org/10.4271/950608.
Pages:
17
Abstract:
Results of comparisons of computed and measured soot and NO in a direct-injection Diesel engine are presented. The computations are carried out using a three-dimensional model for flows, sprays and combustion in Diesel engines. Autoignition of the Diesel spray is modeled using an equation for a progress variable which measures the local and instantaneous tendency of the fuel to autoignite. High temperature chemistry is modeled using a local chemical equilibrium model coupled to a combination of laminar kinetic and turbulent characteristic times. Soot formation is kinetically controlled and soot oxidation is represented by a model which has a combination of laminar kinetic and turbulent mixing times. Soot oxidation appears to be controlled near top-dead-center by mixing and by kinetics as the exhaust is approached. NO is modeled using the Zeldovich mechanism. For individual cases, computed and measured chamber pressure agree within 5%, computed and measured soot profiles agree within 10% and computed and measured NO agree within 30%. More importantly, from case to case the model reproduces trends in emissions adequately.
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