A two-layer soot model for hydrocarbon fuel combustion 2020-01-0243
Emission of particular matter/soot is the major environmental drawback of all hydrocarbon fueled combustion system. Raman spectroscopy measurements of engine-out soot particles showed that the ratio of amorphous layer and graphite layer intensities is strongly correlated with oxidation reactivity of the soot particles, which is strongly depending on fuel type. Oxidation reactivity of the soot particles is a critical parameter for the regeneration of the DPF (diesel particulate filter) and GPF (gasoline particulate filter). Inspired by the Raman spectroscopy, a novel two-layer soot model has been developed for diesel combustion. The model considers the soot particles consisting of two different layers: amorphous layer and graphite layer. Different reaction paths of these two layers have been taken into account in the new soot model. The model was implemented into CONVERGE using user defined functions. A diesel engine case was simulated using the new soot model. The predicted ratio of amorphous layer and graphite layer were compared with the measurements of Raman spectroscopy, which shows good agreement.
Haiwen Ge, Rui He, Peng Zhao
Texas Tech University, Oakland University