天然气发动机可变气门定时的仿真研究  

Simulation Research on Variable Valve Timing of Compressed Natural Gas Engine

作　　者：赵昌普[1] 李艳丽[1] 孙强[1] 王天友[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机工程》2009年第6期1-4,9,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(50676067);中国博士后科学基金项目(20070420698);国家"八六三"高技术研究发展计划项目(2006AA11A195)

摘　　要：利用GT-Power软件建立了天然气发动机仿真模型,并对其进排气门的配气相位进行优化,研究并预测了配气相位优化前后发动机充量系数及功率的变化规律。对该天然气发动机的计算结果表明,采用可变气门定时(VVT)技术后,发动机的功率有明显提高,尤其是在中低转速时,功率提高达到10%以上,大大改善了发动机的动力性能。The simulation model of a compressed natural gas engine was established by using GT-Power software. The intake and exhaust timing were optimized, the behavior of the volumetric efficiency and brake power before and after optimization was investigated and forecasted. The simulated results indicate that by using variable valve timing （VVT） system, the engine brake power has a significant improvement. At low and middle speed range, the brake power rises over 10%, and the engine power performance can be improved greatly.

关 键 词：内燃机 天然气发动机 可变气门定时 充量系数 输出功率 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]