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An experimental examination of the effects of n-hexane and n-heptane fuel blends on combustion, performance and emissions characteristics in a HCCI engine

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  • Aydoğan, Bilal

Abstract

Homogenous charge compression ignition (HCCI) engines are low-temperature combustion engines with high thermal efficiency. The operation range of HCCI engines, which are not directly controlled on combustion, is limited by the problems of knocking and misfiring. At this point, it is aimed to eliminate the problem of knocking at the high engine loads by the charge mixture composition and various operating parameters. In this study, the experiments were performed in a single cylinder, four stroke, port injection HCCI gasoline engine to investigate the effects of n-hexane, n-heptane and n-hexane/n-heptane blends. Combustion characteristics, engine performance and exhaust emissions were determined at different engine speeds (800–1800 rpm), lambda (λ = 1.5–3.0) and inlet air temperatures (60 and 80 °C). Operating range of the HCCI engine was determined by using both pure n-hexane and pure n-heptane fuels. The experiments showed that n-hexane, which has higher octane number than that of n-heptane, has more resistance to knocking. In-cylinder pressure decreased with the increase of lambda for all test fuels. Thermal efficiency increased about 28% by using n-hexane compared to n-heptane at constant lambda (λ = 2.35). The results showed that H75N25 provided larger operating range compared with other test fuels.

Suggested Citation

  • Aydoğan, Bilal, 2020. "An experimental examination of the effects of n-hexane and n-heptane fuel blends on combustion, performance and emissions characteristics in a HCCI engine," Energy, Elsevier, vol. 192(C).
    • Handle: RePEc:eee:energy:v:192:y:2020:i:c:s0360544219322959
    DOI: 10.1016/j.energy.2019.116600
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    References listed on IDEAS

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