Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects, Volume 1. Final report.

摘要

The main objective of this study is to include the group effects of the vaporization and combustion processes in a CWS-fueled cycle simulation of a C.I. engine. A secondary objective of this study is to make additional improvements to the simulation, and to complete a parametric study of input parameters on performance, combustion conditions, and in-cylinder processes. The improvements to the simulation are the addition of a transient Nusselt number calculation for the heat transfer to the droplets, new flexibility in the entrainment model, the possibility of mass and diameter injection profiles other than the previously used ''top-hat'' profile, and a new devolatilization model. The next section presents a review of previous research efforts into both experimental coal-fueled engines, CWS-fueled engine cycle simulations, and analytical studies of group combustion behavior. Next, the model used in the current study is described. Finally, results from this study are presented and discussed followed by conclusions based on these results.