利用快速压缩装置研究不同喷射时刻缸内直喷天然气燃烧特性 .结果表明 ,天然气直喷燃烧可实现快速燃烧 ,缩短喷射时刻与点火时刻的时间差可明显缩短燃烧期 .与均匀混合气燃烧相比 ,碳氢的排放增加 ,缩短喷射时刻与点火时刻的时间差可达到均匀混合气燃烧时相同的排放量 .在很宽的当量比范围内 ,NOx 增加 ,而CO仍维持很低数值 ,且不受喷射时刻的影响 .直喷天然气燃烧可实现较高的压力升高值 ,且其数值不受喷射时刻的影响 ,所达到的高燃烧效率也不受喷射时刻的影响 The rapid compression device was used to study the combustion characteristics of direct injection natural gas at different injection timing.The results showed that direct injection combustion of natural gas can achieve rapid combustion, shortening the time difference between injection timing and ignition timing can significantly shorten the combustion period.Compared with homogeneous mixture combustion, Hydrocarbon emissions increase and shortening the time difference between injection timing and ignition timing can achieve the same emissions for homogeneous mixture combustion. NOx is increased over a wide equivalence ratio range while CO remains low and is unaffected by injection The effect of direct injection On natural gas combustion, a higher value of pressure rise can be achieved, and its value is independent of the injection timing, and the achieved high combustion efficiency is not affected by the injection timing