喷射时刻对部分预混直喷天然气发动机性能影响研究  

Study on the Influences of Injection Timing on Performance of Partially Premixed Direct Injection Natural Gas Engine

作　　者：帅志杰 王谦[1] 张宇宽 曹波 SHUAI Zhijie;WANG Qian;ZHANG Yukuan;CAO Bo(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu,212000,China;Jiangsu Hongrun Biomass Energy Technology Co.,Ltd.)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212000 [2]江苏泓润生物质能科技有限公司

出　　处：《小型内燃机与车辆技术》2022年第6期1-9,共9页Small Internal Combustion Engine and Vehicle Technique

基　　金：国家自然科学基金重点项目(51876083);江苏省重点研发计划(BE2019009-5);镇江市社会发展指导性科技计划项目(FZ2019065)。

摘　　要：为探究采用部分预混直喷方式对天然气发动机燃烧性能及排放的影响,基于康明斯ISX发动机开展缸内过程CFD数值模拟研究,分析了部分预混直喷天然气发动机与高压直喷天然气发动机在相同负荷下燃烧及排放的差异性,进而探明柴油喷射时刻对部分预混直喷模式下发动机燃烧及排放性能的影响。研究结果表明,部分预混直喷天然气发动机在做功能力方面较高压直喷天然气发动机表现得更为出色,但由于预混合燃烧的特点,NOx排放会显著提高,通过优化柴油喷射时刻,从而控制燃烧相位,可以达到保持较高指示热效率的同时降低NOx排放的目的。In order to explore the influence of partially premixed direct injection on the combustion performance and emissions of natural gas engines, CFD numerical simulation study of in-cylinder process was carried out based on Cummins ISX engine. The differences of combustion and emissions between partially premixed direct injection natural gas engines and high-pressure direct injection natural gas engines under the same load were analyzed. Then the influence of diesel injection time on combustion and emission performance of the engine in partially premixed direct injection mode is investigated. The research results show that, in terms of doing work, the partially premixed direct injection natural gas engine performs more outstandingly than high-pressure direct injection natural gas engine. However, because of the characteristics of the premixed combustion, NOxemissions from the former increased significantly. Via optimizing diesel injection time to control the combustion phase, higher indicated thermal efficiency can be achieved while NOxemissions can be reduced.

关 键 词：天然气发动机 柴油引燃 喷射策略 喷射时刻 燃烧特性 排放特性 

分 类 号：TK432[动力工程及工程热物理—动力机械及工程]