高功率密度柴油机用超高压喷射技术研究  

Study of Ultra-high Pressure Injection Technology for High Power Density Diesel Engine

作　　者：王蕊 董东升[2] 魏明亮 杨继雅 隆武强[2] WANG Rui;DONG Dongsheng;WEI Mingliang;YANG Jiya;LONG Wuqiang(State Key Laboratory of Intelligent Agricultural Power Equipment,Luoyang 471039,China;Dalian University of Technology,Dalian 116024,China;Luoyang Tractor Research Institute Co.,Ltd.,Luoyang 471039,China)

机构地区：[1]智能农业动力装备全国重点实验室,河南洛阳471039 [2]大连理工大学能源与动力学院,辽宁大连116024 [3]洛阳拖拉机研究所有限公司,河南洛阳471039

出　　处：《拖拉机与农用运输车》2023年第2期34-37,共4页Tractor & Farm Transporter

基　　金：智能农业动力装备全国重点实验室开放基金(SKT2022010)。

摘　　要：动力领域的高速发展对柴油机功率密度、转速和体积等多项指标均提出了更高的要求。高功率密度柴油机的关键技术开发是提升我国大型农用机械、重型工程机械等性能的有力保障。高功率密度柴油机具有喷油量大的特点,研究适用于高功率密度柴油机的超高压燃油喷射技术具有重要意义。采用数值模拟的方法研究了喷射压力提升对燃油喷雾雾化、燃烧的影响。燃油喷射压力从100 MPa提高到250 MPa,液相喷雾贯穿距变短、气相喷雾占比明显提高,SMD变小;液相喷雾消失时刻提前,平均湍动能增大;随着喷油压力提高,放热率峰值增大,放热时间缩短。采用250 MPa超高压燃油喷射可以提高喷雾雾化质量、加快燃烧速度,有利于柴油机功率密度的提升。The rapid development of the power field has put forward higher requirements for the power density,speed and volume of diesel engines.The development of key technologies for high power density diesel engines is a powerful guarantee to improve the performance of large agricultural machinery and heavy construction machinery in China.High power density diesel engines have the characteristics of large fuel injection volume.It is of great significance to study the ultra-high pressure fuel injection technology suitable for high power density diesel engines.The influence of injection pressure increase on fuel spray atomization and combustion was studied by numerical simulation.When the fuel injection pressure increases from 100 MPa to 250 MPa,the liquid spray penetration becomes shorter,the gas spray proportion increases significantly,and the SMD becomes smaller;The vanishing time of liquid spray is advanced,and the average turbulent kinetic energy increases;With the increase of injection pressure,the peak value of heat release rate increases,the heat release time shortens,and the combustion duration shortens.The use of 250 MPa ultra-high pressure fuel injection can improve the atomization quality of spray,accelerate the combustion speed,and help to improve the power density of diesel engines.

关 键 词：高功率密度柴油机 超高压喷射 雾化质量 燃烧 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]