内燃机工程2025，Vol.46Issue(2)：1-10,10.DOI:10.13949/j.cnki.nrjgc.2025.02.001
直喷氢气发动机分层稀薄燃烧的大涡模拟研究
Large Eddy Simulation of Stratified Lean Combustion in a Direct Injection Hydrogen Engine
韦虹 1马瑞博 1姬费帆 2孟硕 2马文中 1马俊杰 1韩志玉2
作者信息
- 1. 宁波吉利罗佑发动机零部件有限公司,宁波 315336
- 2. 同济大学 汽车学院,上海 201804
- 折叠
摘要
Abstract
To investigate the formation process of the stratified lean mixture in a direct injection hydrogen engine and its influence on the combustion process, three-dimensional computational fluid dynamics (CFD) numerical simulation was carried out on the hydrogen jet, mixing process, and combustion process of two hydrogen injectors of different sizes under the same engine operating conditions based on large eddy simulation (LES) method. An injector simplification scheme was adopted to reduce the calculation time and maintain high accuracy. The effectiveness of the injector simplification scheme was verified by constant-volume vessel and engine simulations respectively. In the constant-volume vessel simulation, the root mean square errors of the jet penetrations of the two hydrogen injectors under different vessel back pressures compared to the test data were within 5. 0％. In the engine simulation, engine cylinder pressures in the combustion stage with the two hydrogen injectors were basically consistent with the test data. The engine simulation results show that there is no substantial difference in the basic characteristics of the engine mixture formation process of the two injectors, but the engine with the small-flow injector has a better mixture stratification effect before ignition and smaller combustion cycle variation. The end of injection (EOI) significantly affects the stability of hydrogen-stratified lean combustion. Excessive delay of EOI will cause the mixture around the spark plug to be too lean, resulting in slow ignition or even misfire.关键词
氢气射流/简化喷射器模型/分层稀燃/直喷氢气发动机/大涡模拟Key words
hydrogen jet/simplified injector model/stratified lean combustion/direct injection hydrogen engine/large eddy simulation(LES)分类
能源与动力引用本文复制引用
韦虹,马瑞博,姬费帆,孟硕,马文中,马俊杰,韩志玉..直喷氢气发动机分层稀薄燃烧的大涡模拟研究[J].内燃机工程,2025,46(2):1-10,10.
