Numerical and Experimental Investigation of Ethyl Alcohol as Oxygenator on the Combustion, Performance, and Emission Characteristics of Diesel/Cotton Seed Oil Blends in Homogenous Charge Compression Ignition Engine

In recent years, entirely combined CFD-Multi-Zone chemistry combustion models have been developed fashionably in investigating the HCCI engine combustion. In this work, an enhanced Multi-zone chemistry model is recommended for the HCCI engine combustion and emission simulation. There are four sorts of zones enclosing the crevice zone; boundary layer zone, external zones and center zone of the engine cylinder have been applied. The volume of each zone is steady and depends on the engine geometry. The boundary layer zone is the closest zone to the engine cylinder wall. In this study, the reduced chemical kinetic oxidation mechanism of diesel/biodiesel-ethanol has been numerically investigated in homogenous charge compression ignition (HCCI) engine. The oxidation mechanism of the diesel oil-biodiesel-ethanol at different blends was developed and coupled with Multi-Zone chemical kinetics model. The recommended detailed chemical kinetics mechanism was developed and validated by applying the multi-zone model for the HCCI engine simulation. The suggested mechanism contains 144 species and 737 elementary reactions. The mechanism is framed out by gathering the reduced Skeletal mechanism for biodiesel reaction with a detailed chemical kinetic mechanism for high temperature of Ethanol combustion. The suggested kinetic mechanism was used to predict the auto-ignition and combustion behaviors of the blends of diesel oil/biodiesel-ethanol at different combustion conditions of HCCI engine. The final combined mechanism was tested at different fuel dos of diesel/biodiesel-ethanol blends. Finally, the mechanism results data was validated with the engine experimental data at different engine operating conditions.