| 摘要:以某大功率天然气发动机为研究对象，基于GT-Power仿真软件研究稳态状况下不同参数对气体发动机空燃比控制的影响。提出了采用空燃比裕度表征气体发动机空燃比控制可靠性的方法，并基于节气门和废气旁通阀实现空燃比分段控制。研究结果显示:减小涡轮喷嘴环面积或者采用MMPC、双脉冲管系可以提高该气体发动机的空燃比裕度。此外仿真计算还表明:随着环境进气温度与空冷后进气温度的升高，气体发动机空燃比裕度下降。因此，为了满足气体发动机的环境适应性，空燃比裕度必须足够大。 |
| 关键词: 气体发动机 空燃比 裕度，节气门 废气旁通阀 |
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| Air-Gas Ratio Control of High Power LNG Engine |
| Zhong Jie,Xu Chen,Li Xiannan,Li Xiang,Zhang Wenzheng,Song Bei |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 201108;Naval Deputy Office of Wuxi，Jiangsu Wuxi 214062 |
| Abstract:Based on GT-Power simulation software, research was carried out on a large power LNG engine to study the influence of varied parameters on the air-gas ratio control of gas engines under steady state. The method of characterizing the reliability of air-gas ratio control for gas engines with air-gas ratio tolerance was put forward. Air throttles and waste gate valves were used to realize air-gas ratio step control. The research results show decreasing the turbine nozzle area, or adopting MMPC or double-pulse pipes can increase air-gas ratio tolerance. Simulation results show that with the increase of both inlet temperatures from the environment and after the air-cooling, the air-gas ratio tolerance of gas engines decreases. Thus, to meet the environmental adaptation requirements of gas engines, the air-gas ratio tolerance has to be big enough. |
| Key words: gas engine air-gas ratio tolerance air throttle waste gate valve |
