内部EGR对柴油机NOX排放影响的模拟研究  

Simulation Study on Influence of Internal EGR on NOX Emission of Diesel Engine

作　　者：沈颖刚[1] 和志高 郭宇辰 蒋文涛 张敬贤 聂珂 Shen Yinggang;He Zhigao;Guo Yuchen;Jiang Wentao;Zhang Jingxian;Nie Ke(Yunnan Key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology,Kunming City,Yunnan Province 650500,China)

机构地区：[1]昆明理工大学云南省内燃机重点实验室,云南省昆明市650500

出　　处：《农业装备与车辆工程》2020年第3期84-86,共3页Agricultural Equipment & Vehicle Engineering

摘　　要：针对改变气门重叠角实现发动机内部EGR。内部EGR对NOX排放的影响研究结果表明:随着负气门重叠角加大,缸压和温度逐渐下降,缸内放热量也随着减少;另外,进入气缸的氧浓度也减少,导致NOX浓度减小。因此负气门重叠角最大20℃A(20NVO)时,缸内NOX浓度最小。The study aimed to change the valve overlap angle to achieve internal EGR of the engine.The results of internal EGR on NOX emissions show that as the negative valve overlap angle increases,the cylinder pressure and temperature gradually decrease,and the heat release in the cylinder also decreases.In addition,the concentration of oxygen entering the cylinder is also reduced,resulting in a decrease in NOX concentration.Therefore,when the negative valve overlap angle is at maximum 20℃A(20 NVO),the NOX concentration in the cylinder is the smallest.

关 键 词：气门重叠角 内部EGR NOX浓度 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]