论文部分内容阅读
众所周知,在火花点火发动机中向提供的混合气加热对发动机性能有重要作用。多少年来,设计人员一直在探索为汽化液体燃油提供足够的热量而不大量地减少发动机的容积效率(充气系数)。为此目的试用了多种方法,如使用发动机的冷却水或废气提供汽化热量等,其结果说明了完全汽化对混合气分布,发动机性能和排放物指标上都有很大影响。本文在理论上探索了产生给定汽化程度时的歧管要求,并进一步了解在压缩和燃烧期间的汽化过程以及残留的液态燃油对形成没有完全燃烧的碳氢化合物与一氧化碳的作用。该项
It is well-known that heating the provided air-fuel mixture in spark-ignition engines plays an important role in engine performance. For years, designers have been exploring ways to provide enough heat to vaporize liquid fuel without significantly reducing the engine’s volumetric efficiency (air-entrainment coefficient). A number of approaches have been tried for this purpose, such as the use of engine cooling water or exhaust gas to provide heat of vaporization, and the results show that complete vaporization has a significant impact on gas mixture distribution, engine performance, and emission specifications. This paper theoretically explores the manifold requirements for generating a given degree of vaporization and further understanding of the vaporization during compression and combustion and the effect of residual liquid fuel on the formation of incompletely combusted hydrocarbons and carbon monoxide. The item