Simulação numérica e análise de um motor de quatro tempos a diesel turbo alimentado
In 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 st...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/50031 |
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| Resumo: | In 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. |
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