摘要
本文通过碳氢在缸套壁面润滑油膜中的扩散模型，研究了油膜对未燃碳氢排放的影响，并开展了相应的试验研究。计算结果表明随着润滑油膜厚度的增加，它对燃油碳氢的吸收或释放量也增加，直至某一临界厚度时达到最大，之后，将保持这一最大值。实际发动机缸套壁面有足够厚的油膜，使其对碳氢的吸收或释放量达到并保持这种最大值。试验结果进一步说明了这一点，且由油膜所致的未燃碳氢排放约占总排放的２８％。
Based on the theoretical model of hydrocarbons diffusing in cylinder lubrication oil film, the effects of the oil film on hydrocarbon emissions are studied. The simulation shows that there exists a critical oil film thickness at which the amount of fuel absorbed to and desorbed from the film reaches maximum, and the value changes little when the film is thicker than the critical one. Under normal operating conditions, the oil film thickness is approximately equal to or bigger than the critical one, so that the oil film almost has a maximum contribution to the exhaust hydrocarbon emissions. The same conclusions can also be derived from the experimental data, and the oil film may contributes about 28% to the total hydrcarbon emissions.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
1997年第2期185-191,共7页
Transactions of Csice
基金
国家攀登计划和博士后科学基金
