![]() ![]() For the fuels closer to the conventional DF2, the effect of those properties is minimal. In the spray formation model, the degree of viscosity and surface tension effect on the spray formation and air entrainment is much more pronounced with DME fuel. While the developed models are validated and evaluated by comparing the predictions with experimental data, some of important conclusions have been made. Then, the premixed combustion model is reformulated to calculate a proper burn rate profile with respect to equivalence ratio and scale the profile with diluted air. The Cetane number is used to describe a fuel effect for both models. The global ignition delay model is based on the global combustion chamber charge properties while the local ignition delay model includes variations in properties of each spray zones. On these foundations, ignition delay models are formulated with two different descriptions based on the origin of the charge properties in a DICI engine. The proposed spray and evaporation models comprise the sub-models including fuel sensitive spray breakup, improved zone velocity estimations with transient fuel injection, spray penetration and tracking of evaporated fuel components. The objective is to develop fuel sensitive sub models of the DICI combustion process and integrate them into a thermodynamic engine cycle simulation. This study describes a development of fuel sensitive quasi-dimensional multi-zone model for a direct injection compression ignition (DICI) engine.
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