天然气发动机进气不均匀性改善研究  

Research on Improvement of Intake Unevenness of Natural Gas Engine

作　　者：刘胜 苏立旺 田永海 LIU Sheng;SU Liwang;TIAN Yonghai(China North Engine Research Institute(Tianjin),Tianjin 300400,China;Tsinghua University,State Key Laboratory of Automotive Safety and Energy,Beijing 100084,China)

机构地区：[1]中国北方发动机研究所(天津),天津300400 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《车用发动机》2019年第5期41-45,共5页Vehicle Engine

摘　　要：针对某天然气发动机的稳压式进气管进气均匀性较差的问题,综合考虑配气相位、燃气混合及各缸进气流量分配,采用一三维耦合数值仿真手段进行了改进优化。试验结果表明,采用改进后的进气管在机组功率为额定功率的80%以上时,各缸的最高燃烧压力不均匀性控制在1.5%以内,很好地解决了各缸工作均匀性较差和排温差别较大的问题,为功率的进一步提升提供了保障。For the poor intake uniformity of constant-pressure intake manifold of natural gas engine, the 1D and 3D coupled numerical simulation was conducted to improve and optimize the intake manifold design by taking into consideration the valve timing, fuel and air mixing and airflow distribution for each cylinder comprehensively. The experimental results show that the unevenness of peak cylinder pressure between cylinders can be controlled within 1.5% by using the modified intake manifold when the power of generation sets is over 80% of the nominal power. The poor intake uniformity of each cylinder and great difference between exhaust temperatures are solved well through the modifications, which provides the basis for further improvement of power.

关 键 词：天然气发动机 进气不均匀性 数值模拟 进气管 结构设计 

分 类 号：TK411.3[动力工程及工程热物理—动力机械及工程]