Effects of Advanced Fuel Injection Strategies on DI Diesel Emissions

Abstract : The focus of the program is developing engineering models for Diesel emissions and performance that: (1) stand alone as preliminary design tools, (2) provide submodels for CFD, spray-marching, and cycle simulations, and (3) offer real-time algorithms for control of smart engines. These models, because of their simplicity, also provide the design engineer with valuable insight into the predominate processes governing engine emissions and performance. The model equations are derived from first principles and are based on Damkohler numbers describing the pollutant chemistry and fluid flow processes. To date emissions of oxides of nitrogen (NO(x)) have received primary emphasis. Both quasi-steady and dynamic models have been developed and examined with data from various engines. Development of similar models for particulate emissions and power density continues. One of the topics examined in the past year is the effect of multiple fuel injections on emissions of nitric oxide.