Optimisation of combustion parameters in turbocharged engines using computational fluid dynamics modelling

Abstract

This study aims to optimize combustion parameters in a turbocharged engine using Computational Fluid Dynamics (CFD) simulation. The main parameters analyzed include fuel injection pressure, air-fuel ratio, and ignition timing. Simulations were performed using ANSYS Fluent software with a k-ε turbulence model and a non-premixed combustion model. The simulation results show that a fuel injection pressure of 1500 bar produces a maximum combustion efficiency of 85%, increasing from 78% in the initial configuration. This increase also impacts increasing engine power by 7.5%, from 80 kW to 86 kW. Although NOx emissions increased by 15.56% to 520 ppm, CO and HC emissions decreased significantly by 43.33% and 40%, respectively, indicating more perfect combustion. The maximum temperature distribution was recorded at 2200 K, while the maximum pressure in the combustion chamber reached 9 MPa, with an average error of the simulation results to the experimental data of less than 5%. This indicates the high accuracy of the model used. This study proves that CFD simulation is an effective tool for optimising combustion parameters, improving energy efficiency, and reducing exhaust emissions in turbocharged engines. This study makes a significant contribution to the development of more efficient and environmentally friendly engine technology. Further research is recommended to explore alternative fuels and more innovative combustion chamber designs.