液化天然气发动机燃料供给系统特性研究  

Research on Characteristics of LNG Engine Fuel Supply System

作　　者：李书华[1] 高莹[1] 董庆远[1] 李楠楠[1] 李君[1] 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130025

出　　处：《内燃机工程》2012年第6期52-57,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"八六三"高技术研究发展计划项目(2009AA11A151)

摘　　要：针对CA6SL2发动机,用AMESim软件建立了液化天然气发动机的燃料供给系统仿真模型,并仿真分析了标定工况和低温冷起动工况下,LNG发动机燃料供给系统内天然气的气相比例、温度和冷却液温度的变化规律。研究结果表明:在标定工况下,冷却液入口温度97℃时,LNG汽化器适宜的冷却液流量范围为15～25L/min;应通过冷却系统与汽化器的匹配,控制发动机冷却系统缸盖出口温度低于100℃;LNG发动机低温冷起动(环境温度为-35℃)时,发动机怠速冷却液流量应高于6L/min;原机的冷却系统具有较好的适度冷却功能。For model CA6SL2 engine, a simulation model of fuel supply system of liquefied natural gas （LNG） engine was built up based on AMESim software and used for analyzing characteristics of the fuel supply system at the rated power point and under low temperature starting condition. The results confirm that in the conditions of rated power and inlet coolant temperature of 97℃, the proper flow rate in LNG carburetor is in range of 15~25 L/min; the coolant temperature at outlet in engine cylinder head should be maintained below 100 ℃by matching the cooling system to the carburetor, during LNG engine low temperature starting （ambient temperature --35 ℃） the coolant flow rate should be more than 6 L/min in idling operation. It is proved that the engine cooling system has good moderate cooling function.

关 键 词：内燃机 液化天然气 燃料供给系统 冷却系统 汽化器 AMESIM软件 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]