Setembro 2016 vol. 3 num. 1 - XXIV Simpósio Internacional de Engenharia Automotiva

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Características da combustão de um motor diesel com injeção direta de misturas de óleo diesel e etanol e injeção indireta de etanol

Combustion characteristics of a diesel engine fueled with diesel oil-ethanol blends and ethanol fumigation

OLIVEIRA, Alex de ; SODRÉ, José Ricardo ; , ;

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Pesquisas sobre a aplicação de combustíveis renováveis alternativos em motores Diesel têm ganho interesse. A estratégia de operação bicombustível, usando etanol e óleo diesel como combustíveis, é atraente devido ao potencial de reduzir as emissões regulamentadas, como óxidos de nitrogênio (NOX) e material particulado (MP), e aumentar a eficiência de conversão do combustível. Para compreender claramente os efeitos da utilização da técnica bicombustível em motores diesel, existe a necessidade de estudar os parâmetros de combustão. A presente investigação avaliou os efeitos da utilização de etanol por duas técnicas distintas, injeção direta de misturas de óleo diesel e etanol e injeção indireta de etanol com injeção direta de óleo diesel. Foram avaliados a taxa de aumento de pressão no cilindro, o atraso da ignição e a taxa líquida de liberação de calor para determinar a duração da combustão e o ângulo do virabrequim em que há liberação de 50% do calor total (CA50). Altas taxas de aumento de pressão podem causar detonação no cilindro e o parâmetro CA50 é importante, pois traduz a eficiência de conversão de energia do combustível no motor. Os testes foram realizados em um motor diesel de quatro cilindros, 44 kW, alimentado por misturas de óleo diesel e etanol com concentrações de até 15% de etanol e injeção indireta de até 30% de etanol. Os resultados mostraram que a adição do etanol causou um aumento no atraso de ignição, na taxa de acréscimo da pressão no cilindro e na duração de combustão reduzida, com aumento da quantidade de calor liberado durante a fase pré-misturada da combustão. Não foram observados danos ao motor com a adição de etanol.

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DOI: 10.5151/engpro-simea2016-PAP77

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Como citar:

OLIVEIRA, Alex de; SODRÉ, José Ricardo; , ; "Características da combustão de um motor diesel com injeção direta de misturas de óleo diesel e etanol e injeção indireta de etanol", p. 551-566 . In: Anais do XXIV Simpósio Internacional de Engenharia Automotica - SIMEA 2016 [=Blucher Engineering Proceedings].. São Paulo: Blucher, 2016.
ISSN 2357-7592, DOI 10.5151/engpro-simea2016-PAP77

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