Resumo

ROMERO-PIEDRAHITA, Carlos Alberto; MEJIA-CALDERON, Luz Adriana  e  CARRANZA-SANCHEZ, Yamid Alberto. Sensitivity analysis of engine warm-up performance at idle conditions to the changes in compression ratio, ethanol content in gasoline fuel and cylinder head material. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.204, pp.238-247. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n204.67311.

This paper presents the evaluation of the effects caused by variations of the compression ratio, the material of the cylinder head and the composition of the fuel on the engine speed, fuel consumption, warm-up time and emissions of an air-cooled spark ignited engine using an experimental design methodology. The objective of the work was to determine the sensitivity of the engine responses operating at idle conditions, as well as the optimal combination between the mentioned parameters. Of the three factors evaluated, the compression ratio is the factor that has exerted the largest influence on the performance of the engine at idle speed. The steady-state temperatures of the engine reduce with the increase in the compression ratio, with the higher conductivity of the material and with the higher ethanol content.

Palavras-chave : combustion engine; compression ratio; ethanol-gasoline blends; material; warm-up.

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