Barbosa Júnior, Cleiton Rubens FormigaBezerra, Daniel Albuerne Diniz2022-12-082022-12-082022-11-18BEZERRA, Daniel Albuerne Diniz. Simulação numérica e análise de um motor de quatro tempos a diesel turbo alimentado. Orientador: Cleiton Rubens Formiga Barbosa Júnior. 2022. 61 f. Trabalho de Conclusão de Curso (Graduação em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/50031In this paper, a virtual model of a four-stroke spontaneous ignition internal combustion engine based on the MIVEC 2.4L turbo diesel engine used in the Pajero Sport HPE car was developed. In Diesel - RK software, the geometric parameters of a real engine were used as input data, such as piston stroke, piston diameter, compression ratio, number of cylinders and the compression ratio of the turbo-compressor, provided by the manufacturer's catalogue. Therefore, it was possible to obtain an approximation of the real parameters of the engine based on the regimes of maximum power, maximum torque, idle speed and intermediate powers. Through these data, the first simulation was performed for the maximum power regime following the instructions of a practical exercise suggested by the software itself, resulting in a very divergente power value from provided by manufacture. To reduce this difference, as recommended by the program, changes were made to the geometric parameters of the valves and an optimization of the combustion injection time to increase the combustion efficiency in the expansion time, getting closer to the real model and increasing, this way, virtual engine power. After these optimizations, the margin of error dropped dramatically, reaching a difference of only 4% from the real engine, resulting in values consistent with Mitsubishi values. Changes were carried out changes in all operating regimes, such as idling, intermediate power and especially for maximum torque mode, which resulted in a difference of only 4.17% from the real engine. Finally, with all the calculated regimes, the power, torque, average effective pressure and specific fuel consumption curves were obtained, all as a function of the respective RPM values for each operating regime. The final results obtained were close to the real engine model, presenting the curves of the graphs in agreement with the theory under study. The methodology applied for this production of the virtual engine model is replicable and can be improved, providing for better results as long as wealth of information provided by the manufacturer, which is sometimes confidential. The engine performance simulation with software is important for a better understanding of its operation, as well as for the application of improvements in relation to its performance, in order to bringing cost savings due to it does not require a prototype study.Diesel - RKRegimes de operaçãoSimulaçãoPotênciaPowerTorqueSimulationOperating regimensbachelorThesis