内燃机中柴油附壁油膜蒸发模型  

Wall film evaporation model for diesel in internal combustion engines

作　　者：刘红[1] 闫燕安 贾明[1] 何阳 张威龙 LIU Hong;YAN Ya′nan;JIA Ming;HE Yang;ZHANG Weilong(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院海洋能源利用与节能教育部重点实验室

出　　处：《哈尔滨工程大学学报》2019年第11期1846-1850,共5页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51376038,91641117)

摘　　要：针对内燃机中喷雾碰壁产生附壁油膜导致性能下降的问题,本文采用解析方法建立了一维非稳态附壁油膜加热蒸发模型以及多组分燃油组分变化模型,使用6种典型燃料表征实际柴油的特性。计算分析了多组分混合燃料的加热蒸发特性以及组分变化规律。应用该数学模型讨论了环境压力和壁面温度对附壁油膜蒸发特性的影响。结果表明:降低环境压力和提高壁面温度可以有效缩短油膜寿命,并且油膜的蒸发率随着轻组分的大量蒸发先达到峰值后,再逐渐降低。Considering the wall film formation by spray-wall interaction in internal combustion engines,which results in a detrimental effect on the engine performance,one-dimensional unsteady wall film models of heating and evaporation and component change were developed based on a new analytical solution.Six hydrocarbon species were used to model the composition of a typical diesel fuel.Heating and evaporation characteristics of multi-component mixed fuel and composition variation were calculated and analyzed,and the effects of ambient pressure and wall temperature were investigated using the abovementioned model.The results show that fuel film lifespan could be reduced by decreasing ambient temperature and increasing wall temperature.Moreover,the evaporation rate of wall film first increased to the peak with the dramatic evaporation of light components before decreasing gradually.

关 键 词：内燃机 附壁油膜 蒸发 传质 解析方法 多组分 燃料 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]