| Split Cycle Clean Combustion (SCCC) concept is a combustion process that results in reduced gaseous and particulate emissions while maintaining high engine efficiency when compared to the current state of the art diesel engine combustion process. Currently, some manufacturers have been commercially producing gasoline engines based on a similar Homogeneous Charge Compression Ignition (HCCI) concept, there are currently no diesel fuel powered SCCC engine existing in the market. This is due to the fact that the performance of these engines at various load conditions has not been completely evaluated.;The objective of this thesis is to design and evaluate the performance of a new diesel engine based on Split Cycle Clean Combustion (SCCC) concept for clean diesel combustion using one-dimensional simulation techniques. This study covers the engine and plant modeling of the SCCC engine using diesel fuel and comparison of its performance to a standard diesel engine of similar geometric size, to evaluate it performance and emission improvement claims.;A standard 4.4 liter displacement in-line four-cylinder engine model based on the compression ignition (CI) cycle, which is commercially available in Caterpillar Hydraulic Excavator 316, was modeled as per the dimensions. The engine model performance results were compared to the simulated test data obtained from Caterpillar and the engine model was satisfactorily validated.;A second model with similar geometry was developed on the SCCC concept with practically feasible geometry, compression ratios and air system dimensions. The design was improved using "design of experiments" (DOE) method. The model was simulated in various configurations under part load and full load condition to obtain data for key variables such as gross power, fuel consumption, soot production, NOx production and engine controllability. This study does not include modeling of emissions for the SCCC engine, and relies on published claims of various studies and experiments for soot and NOx predictions.;Results were compared to claims of various studies in published literature, as well as to simulation results from Caterpillar's CatRTM C4.4 current production engine in their hydraulic Excavator 316. The results confirm that SCCC engine operating on diesel fuel can be designed to have similar thermal efficiency and power density to a conventional compression ignition cycle based engine of the exact same displacement, while also substantially reducing the presence of unburned hydrocarbons, NOx and Soot particles in the exhaust. |
