Investigation on the Octane Sensitivity of Gasoline Fuel


The potential improvement of SI combustion has been investigated for the alkane fuels with distinguished autoignition properties, that is, the negative octane sensitivities. From the reported RON and MON of pure hydrocarbons, the alkane compounds with negative octane sensitivity were selected and then numerical simulations have been performed by generating the oxidation mechanisms by KUCRS auto-generation tool. As a common features of the negative octane-sensitivity fuels, the prominent NTC (negative temperature coefficient) behaviors were observed. The relationship between the NTC or octane sensitivity and chemical structures of alkanes were discussed. As a general trend, the alkyl substitution decreases the octane sensitivity especially when the substitution was made at third (or larger) position from the edge of the main chain. The replacement of substituent from methyl group to ethyl group significantly decreases the octane sensitivity. The investigation on the pressure and equivalence ratio dependencies were shown. The autoignition trends have been investigated by varying the compression ratio.ガソリン燃料の改革のポテンシャルを従来のRON/MONを超えた視点から,再検討を行った.本発表では,特に負のオクタン感度を持つ燃料に関する検討結果を報告する.


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  • Accession Number: 01689606
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Nov 26 2018 3:02PM