Comparison of the Representative Interactive Flamelet Model and the Magnussen Model for Combustion and Pollutant Formation in DI-Diesel Engines to Experiments
3rd International Conference on High Performance Computing in the Automotive Industry, 7th - 10th October 1996, Paris, France, (1997)Abstract
Pollutant formation in the n-heptane fueled Volkswagen DI 1900 Transparent Diesel engine is investigated. Numerical simulations using two different combustion models are compared to experiments. The combustion models are the recently developed Representative Interactive Flamelet (RIF) model and the Magnussen Eddy Dissipation model in combination with the Hiroyasu soot model. The flamelet equations are transformed to one dimension, which allows the RIF model the simulation of the complete chemistry comprising auto-ignition, the transition to diffusive burning as well as the formation of pollutants like NOx and soot. Hence, the highly nonlinear dependencies of the chemistry need not to be simplified, and the complete structure of the flame is preserved, which is a unique feature of this model. The Magnussen model is still a commonly used tool in turbulent combustion simulations. The auto-ignition has to be modeled separately. Here we use a one step global reaction of Arrhenius-type. In this study basic differences in the modeling aspects are addressed and discussed. Data of simulations and measurements for four different Exhaust Gas Recirculation (EGR) cases are compared.