喷油参数对F-T煤制油混合气特性的模拟研究  

Simulation Study of Fuel Injection Parameters on F-TFischer-Tropsch Fuel Mixture Characteristics

作　　者：王浩亚 王铁 石晋宏 冀冠佐 WANG Hao-ya;WANG Tie;SHI Jin-hong;JI Guan-zuo(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Shanxi Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024

出　　处：《机械设计与制造》2024年第3期265-270,共6页Machinery Design & Manufacture

基　　金：中型载货车平台燃料电池动力系统与整车集成技术(20181102006)。

摘　　要：基于三维流体动力学软件CONVERGE,耦合F-T煤制油表征燃料简化机理,建立F-T煤制油发动机的多维燃烧数值仿真模型,研究了喷油参数对F-T煤制油发动机典型工况下燃油喷雾、油气混合和缸内温度场的作用规律。结果表明:由于F-T煤制油十六烷值高、着火性能好的特性,一定程度的提前预喷正时和主喷正时能促进F-T煤制油的雾化和蒸发效果,有利于在滞燃期形成更多的均匀混合气,加快燃烧和放热速度,提高缸内温度;增加喷射压力能够显著提升油束湍动能,提高燃油蒸发率,缸内混合气分布更加均匀,有利于着火、快速放热;预喷油量的增加能够使油束贯穿距离增加,燃油蒸发率升高,但会加剧燃油碰壁的现象,缸内凹坑处局部过浓区域增加,着火阶段造成更多的燃烧冲击。提前喷油、增大喷射压力结合较小预喷油量的喷射参数组合有助于改善F-T煤制油发动机的燃烧过程,提高燃烧效率。Based on the three-dimensional fluid dynamics software CONVERGE,coupled with Fischer-Tropsch fuel to describe the simplified fuel mechanism,the multi-dimensional combustion numerical simulation model of Fischer-Tropsch fuel engine was established,and the effects of fuel injection parameters on the fuel spray,oil-gas mixing and in-cylinder temperature field of Fisch-er-Tropsch fuel engine under typical working conditions were studied.The results show that due to the characteristics of high cetane value and good ignition performance of Fischer-Tropsch fuel,a certain degree of advance pre-injection timing and main injection timing can promote the atomization and evaporation effect of Fischer-Tropsch fuel,which is conducive to the formation of more uni-form mixture in the combustion retardation period,speed up the combustion and heat release rate,and increase the temperature in the cylinder.Increasing the injection pressure can significantly increase the turbulent kinetic energy of the oil bundle,improve the fuel evaporation rate,and the mixture distribution in the cylinder is more uniform,which is conducive to ignition and rapid heat re-lease.The increase of the pre-injection amount can increase the penetration distance of the oil bundle and the fuel evaporation rate,but it will aggravate the phenomenon of fuel hitting the wall,increase the local over-dense area of the pit in the cylinder,and cause more combustion impact in the ignition stage.The combination of injection parameters such as advanced injection,increased injection pressure and smaller pre-injection amount can improve the combustion process and combustion efficiency of Fischer-Tropsch fuel engine.

关 键 词：F-T煤制油 喷油参数 燃烧特性 多维仿真 

分 类 号：TH16[机械工程—机械制造及自动化] TK427[动力工程及工程热物理—动力机械及工程]