Effects of different combustion modes on the thermal efficiency and emissions of a diesel pilot-ignited natural gas engine under low-medium loads

作     者：JIN Shou-ying LI Jin-ze ZI Zhen-yuan LIU Ya-long WU Bin-yang 靳守营;李金泽;字振源;刘亚龙;邬斌扬

作者机构：State Key Laboratory of EnginesTianjin UniversityTianjin 300072China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第7期

页      面：2213-2224页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Project(2017YFE0102800)supported by the National Key R&D Program of China Project(19JCYBJC21200)supported by the Tianjin Natural Science Foundation,China 

主　　题：diesel pilot-ignited natural gas engine direct injection of natural gas combustion mode thermal efficiency emissions 

摘      要：Research on dual-fuel(DF)engines has become increasingly important as engine manufacturers seek to reduce carbon dioxide *** are significant advantages of using diesel pilot-ignited natural gas engines as DF ***,different combustion modes exist due to variations in the formation of the *** research used a simulation model and numerical simulations to explore the combustion characteristics of high-pressure direct injection(HPDI),partially premixed compression ignition(PPCI),and double pilot injection premixed compression ignition(DPPCI)combustion modes under a low-medium *** results revealed that the DPPCI combustion mode provides higher gross indicated thermal efficiency and more acceptable total hydrocarbon(THC)emission levels than the other *** to its relatively good performance,an experimental study was conducted on the DPPCI mode engine to evaluate the impact of the diesel dual-injection strategy on the combustion *** the DPPCI mode,a delay in the second pilot ignition injection time increased THC emissions(a maximum value of 4.27g/(kW·h)),decreased the emission of nitrogen oxides(a maximum value of 7.64 g/(kW·h)),increased and then subsequently decreased the gross indicated thermal efficiency values,which reached 50.4%under low-medium loads.