摘要
基于ECF-3Z燃烧模型建立适应高原环境的某增压柴油机工作工程模型,在平原台架试验验证的基础上,分析了喷油提前角对海拔4550m下缸内燃烧过程的影响。模拟结果表明:喷油提前角增大,缸内燃烧压力、温度曲线峰值上升且出现时间前移,燃烧重心提前,NOx排放上升,功率得到恢复;同时,缸内预混合燃烧得到强化,后燃期变短,燃烧室中心区域空气利用率得到提高。根据模拟结果选择提前6°CA喷油并在海拔4550m下对原机进行试验。试验结果表明:在调整喷油提前角后,功率提升了3.6%,涡前排气温度上升了46.6℃,燃油消耗率下降了1.4%。
By using a ECF-3Z model on the working process of a turbocharged diesel engine in plateau environment, the influence of injection advance angle on the combustion process performance at 4550 m altitude was analyzed which was verified by the experimental results obtained in plain area. The simulation results show that with the increase of the injection advance angle, the maximum combustion pressure and average temperature in the cylinder are increased and the initial ignition time is advanced, which result in increase in NOx emission and power. In the meantime, the enhanced premixed combustion and shortened afterburning time would improve the utilization ration of air in the center of combustion chamber. Based on these results, the angle was fixed at 6 ℃A BTDC at 4500 m altitude. The experimental results show that comparied with the original advance angle the power is increased by 3.6 % and the exhaust gas temperature before the turbocharger is increased by 46.6 ℃, while the specific fuel consumption is reduced by 1.4%.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2015年第6期118-123,共6页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
增压柴油机
高原
喷油提前角
缸内燃烧
IC engine
turbocharged diesel engine
high altitude
injectionadvance angle
in-cylinder combustion
