DI Diesel Performance and Emissions Model
Abstract
Based on findings indicating that both the Zeldovich and N2O mechanisms are important in the formation and decomposition of NO in direct injection (DI) Diesel engines a skeletal mechanism consisting of seven elementary reactions is used to develop a two-zone model for NO(x) emissions from DI Diesel engines. Characteristic chemical kinetic times for NO formation in zone 1 and NO decomposition in zone 2 are formulated from the law of mass action applied separately to each zone and the relative importance of NO decomposition in four DI Diesel engines is examined. Preliminary fluid mechanic mixing times for NO formation are developed by the combination of fluid relations characteristic of each of the many mixing processes occurring in a DI Diesel engine. These results are empirical, but future fluid mechanic mixing times applicable to all DI Diesel engines may be found. Similarly, a two-zone soot CTM accounting for both soot formation and oxidation is outlined. The NO(x)/soot tradeoff for low loads is also proven using the preliminary models for soot and NO(x) thereby showing that when complete the models will predict the correct trends.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 1998
- Accession Number
- ADA344633
Entities
People
- A. M. Mellor
- J. P. Mello
- M. A. Psota
- W. L. Easley
Organizations
- Vanderbilt University