高原缺氧环境下柴油主喷正时对氢气/柴油双燃料发动机燃烧与排放的影响
Effects of Diesel Main Injection Timing on Combustion and Emission of Hydrogen/Diesel Dual-Fuel Engine under Highland Hypoxia Environment
刘少华 1黄楚溪 1毕玉华 1申立中 1闫壮壮 1彭益源2
作者信息
- 1. 昆明理工大学云南省内燃机重点实验室,云南昆明 650500
- 2. 云南菲尔特环保科技股份有限公司,云南昆明 650300
- 折叠
摘要
为了研究高原缺氧环境下柴油主喷正时对氢气/柴油双燃料发动机燃烧与排放的影响,搭建了氢气/柴油双燃料发动机试验台架,在最大扭矩转速1 600 r/min,30%、50%、70%负荷、海拔2 000 m高原缺氧环境下进行了发动机燃烧与排放特性试验.研究结果表明:主预喷间隔固定,随着柴油主喷正时的推迟,缸压峰值下降,瞬时放热率峰值对应的相位后移,碳烟、CO排放上升,NOX排放下降;在三种负荷下,双燃料NOX排放最大下降幅度分别为53.9%、57.9%、40%.当三种负荷下氢气替代率分别为27.4%、21.2%、15.4%时,与纯柴油模式相比,NOX 排放上升,CO、CO2 排放下降.30%负荷下,当柴油主喷正时为-8°CA ATDC时,双燃料模式下CO排放与CO2排放分别下降 46.5%与 17.3%;30%和 50%负荷下,碳烟排放下降,平均降低幅度分别为21.55%和11.69%;70%负荷下,碳烟排放上升,平均上升幅度为32.62%.
Abstract
To study the effect of diesel main injection timing on the combustion and emission of a hydrogen/diesel dual-fuel engine in a plateau oxygen-deficient environment,a hydrogen/diesel dual-fuel engine test rig was con-structed,and the engine combustion and emission characterization tests were carried out in a plateau oxygen-deficient environment at an altitude of 2000 m at the maximum torque speed of 1600 r/min and under 30%,50%,and 70%loads.The results show that:the main pre-injection interval is fixed,with the postponement of the diesel main injec-tion timing,the peak cylinder pressure decreases,the phase corresponding to the peak transient exothermic rate is shif-ted back,the carbon smoke,and CO emission rises,and the NOX emission decreases;under the three loads.The maxi-mum reductions in dual-fuel NOX emissions were 53.9%,57.9%,and 40%,respectively.When the hydrogen substi-tution rate is 27.4%,21.2%,and 15.4%at the three loads,respectively,NOX emission rises,CO,and CO2 emission decreases compared with the diesel-only mode,and at 30%load,when the diesel main injection timing is-8°CA ATDC,CO emission and CO2 emission decrease by 46.5%and 17.3%,respectively,in the dual-fuel mode,and at 30%and 50%loads,carbon soot emission decreases with an average reduction of 21.55%and 11.69%,respectively,and carbon soot emission increases with an average increase of 32.62%at 70%load.
关键词
氢气/柴油双燃料/主喷正时/放热率/NOX排放/CO2排放Key words
hydrogen/diesel dual fuel/main injection timing/heat release rate/NOX emission/CO2 emission引用本文复制引用
基金项目
国家自然科学基金项目(52066008)
云南省杨延相专家工作站项目(202205AF150075)
出版年
2024
NETL
NSTL
万方数据