一种改善增压天然气发动机动力性的方法及试验验证  

A Method of Power Performance Improvement of a Turbocharged LNG Engine and Its Experimental Verification

作　　者：张孔明 梁世希 金则兵 张帆 王科 廖诚[2] 

机构地区：[1]北京绿能高科天然气应用技术研究院,北京100101 [2]湖南大学先进动力总成技术研究中心,长沙410082

出　　处：《内燃机工程》2016年第6期246-252,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家"九七三"重点基础研究发展计划项目(2011CB707201)

摘　　要：分析对比了各种增压方法的优势和劣势,提出向压气机后补气,即利用废气涡轮辅助增压系统(EAS系统)改善动力性的方法,并进行台架和整车试验验证。通过分析不同补气压力对发动机性能的影响,得到影响动力性的主要参数是进气压力;补气后喘振趋势增加,合理控制补气速率可以避免喘振。研究结果表明:此方法使发动机低速最大转矩提升率达50%,最大转矩转速向低速移动至900r/min(原机1 200r/min);补气后整车的起步、加速、爬坡性能也得到显著改善。First a variety of advanced methods of pressure boost were analyzed and compared, then a new method of extra air supply to the pipe behind a compressor, i.e. an auxiliary booster system of turbo-charging（EAS system） was put forward and tested on bench and vehicle. The influence of extra air pressure on engine performance was analyzed, revealing that the main determinant of power performance is intake manifold pressure. The trend of surge increased with extra air supply and the surge could be avoided through the control of the rate of extra air supply. The results show that the maximum torque at low speed increases with a boosting rate of up to 50% when EAS system is used, the speed of the maximum torque moves towards low speed, to 900 r/min from original 1 200 r/min, and starting, accelerating and climbing performances are also improved observably.

关 键 词：内燃机 液化天然气发动机 补气 喘振 台架和整车试验 

分 类 号：TK437[动力工程及工程热物理—动力机械及工程]