What is it about?
Due to its simplicity, the classical Otto cycle model for spark-ignited internal combustion engines have only two adjustable parameters, namely (i) the engine compression ratio, r, and (ii) the working gas isentropic expansion exponent, k, owing to its extreme idealization. Although it teach us basic spark-ignited internal combustion engine performance behavior in an analytical and optimistic fashion, similarly fundamental parameters, such as engine operating speed and basic crank-rod mechanism dimensions, are lacking. The validated numerical model proposed in this work addresses such limitations while remaining sufficiently simple for advanced undergraduate engineering education settings.
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Why is it important?
The model proposed in the work is a valuable engineering education resource, since it is not only able to capture more internal combustion engine effects—such as engine speed, spark and combustion timings, as well as crank-rod mechanism dimensional parameters—but it also exposes engineering students to model simulation and to a discretization-based numerical method.
Perspectives
The model described in the article may not only become advanced undergraduate or basic graduate engineering teaching material, but its approach to thermodynamic cycle modeling and calculation is inspirational on further research topics.
Christian Naaktgeboren
Universidade Tecnologica Federal do Parana
Read the Original
This page is a summary of: An air-standard finite-time heat addition Otto engine model, International Journal of Mechanical Engineering Education, February 2017, SAGE Publications,
DOI: 10.1177/0306419016689447.
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