摘要
利用快速压缩装置开展了直喷天然气发动机燃烧特性的研究 ,分析了 3种不同喷射方式下的燃烧特性并与均相混合气燃烧进行了对比。研究结果表明 :直喷天然气燃烧比均相混合气燃烧的最大压力高 ,在宽广的当量比范围内具有短的火焰发展期和快速燃烧期 ,其燃烧放热率和压力升高率基本上与喷射方式无关。喷射方式与均相混合气相比 ,燃烧放热率快 ,压力升高率大。缩短喷油和点火间的时间间隔将缩短火焰发展期和快速燃烧期 ,其时间间隔的优化对直喷天然气发动机极为重要。直喷天然气发动机的燃烧方式为预混控制充量分层燃烧 ,此燃烧方式燃烧速率快 ,排放低。
Investigation of combustion characteristics of direct injection natural gas engine is carried out using a rapid compression machine.Combustion characteristics of three types of injection modes are analyzed and compared with that of homogeneous combustion.The results show that direct injection natural gas combustion has higher value of pressure rise due to combustion than that of homogeneous mixture.Short flame development and rapid burining period is found in the case of fuel injection for the wide range of equivalence ratio.No great difference in the rate of heat release and the rate of pressure rise is also found for different fuel injection modes.The heat release rate and the rate of pressure rise in the case of fuel injection combustion has the high value and finishes early compared with that of the homogeneous mixture combustion.The study found that flame development and rapid burning period would decrease with the shortening of the time interval between the fuel injection and the ignition start.Optimization of the time interval between the fuel injection and ignition start is a key important parameter for the direct injection natural gas engine.The study shows that the combustion of direct injection natural gas is the premixed controlled statified charge combustion.The premixed controlled stratified charge combustion has the advantage of low emission and fast burning rate.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2001年第4期314-322,共9页
Transactions of Csice
基金
国家杰出青年基金资助项目 (5992 561 7)
