Evolution of in-cylinder polycyclic aromatic hydrocarbons in a diesel engine fueled with n-heptane and n-heptane/toluene
作者： Xiaowei Wang , Chonglin Song , Gang Lv , Jinou Song , Hao Li
DOI: 10.1016/J.FUEL.2015.05.053
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摘要: Abstract This work studied the evolution of in-cylinder polycyclic aromatic hydrocarbons (PAHs) in a diesel engine fueled with n -heptane, and explored effects adding toluene to -heptane on PAHs. In-cylinder PAHs were sampled direct injection using total cylinder sampling system. analyzed by gas chromatography–mass spectrometry programmed temperature vaporization solvent vent mode. For mass ( Σ M ) increased premixed late diffusion combustion phases, decreased early phases. Among 16 detected, Naphthalene (Nap) was most abundant. two benzene rings one five-membered ring, such as Acenaphthylene, Acenaphthene Fluorene, also plentiful, implying that ring could play an important role growth When 20 vol.% ΣM varied. The for -heptane/toluene Toluene addition reduced phase up 48% but 30% phase. In subsequent phase, approximately 67%. individual PAHs, generally percentages Nap during process larger indicating conducive form
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