柴油机燃用正庚烷及柴油时多环芳香烃与碳烟的演化规律  

Histories of Polycyclic Aromatic Hydrocarbons and Soot During Combustion Process of Diesel Engine Fueled with N-Heptane and Diesel Fuel

作　　者：王磊[1] 宋崇林[1] 王林[1] 吕刚[1] 张华伟[1] 何浩然[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2012年第3期214-219,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(51076116);天津市应用基础及前沿技术研究计划资助项目(09JCZDJC25100)

摘　　要：基于电控燃油喷射柴油机的全气缸取样系统,使用气相色谱-质谱联用仪及程序升温大体积进样方法,对柴油机燃用正庚烷和柴油过程中缸内多环芳香烃(Polycyclic aromatic hydrocarbons,PAHs)和碳烟的演化规律进行了试验研究.结果表明:在燃烧过程中,芘、苯并[a]芘质量随曲轴转角呈单峰变化,萘、芴质量随曲轴转角呈"S"型变化趋势(先降低后升高再降低);碳烟的生成趋势与缸内温度呈较好的一致性,且碳烟与芘随曲轴转角具有相似的单峰状质量变化趋势,只是碳烟峰值出现的时刻稍有滞后.此外,正庚烷与柴油在柴油机中燃烧时生成的PAHs与碳烟具有相似的演化规律.Based on a novel total cylinder sampling system and gas chromatography-mass spectrometry （GC-MS） with programmed temperature vaporization and large volume injection （PTV）, the histories of in-cylinder polycyclic aromatic hydrocarbons （PAHs） and soot during combustion process was investigated fueled with n-heptane and diesel fuel. Experimental results show that the mass of pyrene and benzo （a） pyrene give an unimodal variation trend versus the crank angle, while the mass of naphthalene and fluorene exhibits an S-shaped variation trend （decrease-increase-decrease） during combustion process. The trend of soot mass is in good agreement with cylinder temperature, and unimodal variation trend of soot mass. Similar to that of pyrene, soot attains its peak at a sligthly delayed crank angle compared to that of pyrene. Moreover, the histories of PAHs and soot for n-heptane is consistent with those of diesel fuel.

关 键 词：柴油机 燃烧过程 多环芳香烃 碳烟 正庚烷 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]