Simulation of the Exhaust Gas Neutralization Process in the Engine Combustion Chamber Using a Ceramic Coating

This article presents a hypothesis, phenomenological and mathematical models of the exhaust gas neutralization process of an internal combustion engine inside the combustion chamber. The neutralization of exhaust gasses is estimated from surface catalytic properties of the coating, formed on the surface of the combustion chamber parts by microarc oxidation. Phenomenological and mathematical models of the exhaust gases neutralization process in the combustion chamber were developed. Phenomenological model of neutralization process is based on particle diffusion into the surface layer of the coating. Mathematical model is based on Fick’s first law and takes into consideration great amount of factors, which affect the process of neutralization: geometrical dimensions and operating characteristics of the engine; properties of coating and exhaust gasses composition. Verification of developed mathematical model was shown in this work. During verification, experimental data, acquired using motor tests of two-stroke 2-cylinder engine RMZ-551 was applied. Calculations were done for the most indicative operating mode of the engine, in which the highest effect of neutralization can be observed. A comparative analysis of the calculated and experimental data was carried out using the concentrations of the CO and NOx components. Calculated values, acquired with the developed mathematical model, differ from experimental values of concentration decrease of previously said exhaust gasses components by 23.3 and 30.4%, respectively. It shows that presented mathematical model could be used for obtaining computational high convergence results. © 2023 School of Science, IHU. All rights reserved.