Octane rating effects of direct injection fuels on dual fuel HCCI-DI stratified combustion mode with port injection of n-heptane

Yong Qian, Hua Li, Dong Han, Libin Ji, Zhen Huang and Xingcai Lu

Energy, 2016, vol. 111, issue C, 1003-1016

Abstract: Experimental study on dual fuel HCCI-DI stratified combustion mode is investigated with port injection of n-heptane and direct injection of primary reference fuels (PRFs) with different octane numbers from 0 to 100. Firstly, in-cylinder stratifications of mixture concentration, composition, and temperature for this HCCI-DI combustion mode were numerically simulated. The effects of the octane number of the DI fuel, the overall equivalence ratio and the premixed fuel fraction by port injection on the combustion, emissions and performance characteristics are studied. Further, the premixed fuel fraction in this dual fuel HCCI-DI stratified combustion mode is optimized based on the octane rating of the DI fuels. It was found that at lower premixed ratio of HCCI-DI combustion, dual-fuel sequential combustion was observed when high octane number fuels were used as directly injected fuel. And the ignition of the direct injected fuels was mainly determined by the active radicals or thermal energy-active radical. At large premixed ratio, the ignition of direct injected fuels was determined by the thermal-atmosphere but almost not influenced by partial equivalence ratio of DI fuels and their octane number.

Keywords: Octane number; Dual-fuel sequential combustion; HCCI-DI combustion; Stratification; Primary reference fuel (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:111:y:2016:i:c:p:1003-1016

DOI: 10.1016/j.energy.2016.06.044

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