柴油/天然气双燃料增压发动机的性能研究

Research on performance of Turbocharged Engine with Natural Gas-Diesel Dual Fuel

针对6105增压柴油/天然气发动机,通过提高发动机的压缩比、改进燃烧室结构,改善了发动机的经济性能,尤其降低了低速工况时的比油耗和排气烟度。同时,对供油提前角和天然气替代柴油率对发动机性能的影响进行了深入的探讨。试验结果表明适当增大双燃料发动机的供油提前角对其经济性是有利的,CO和HC排放降低,但NOx排放增加;替代率是影响发动机排放的重要因素之一。

In this study, the economic performance of turbocharged engine with diesel/natural gas dual fuel, especially at low speed ,is enhanced by increasing the compression ratio and changing the configuration of the combustion chamber. The effects on the engine while adjusting the advanced fuel supply angle and the substitution ratio are also investigated. Experiment results show that,by advancing the time of fuel supply can benefit the economic performance and reduce CO and HC emissions,but produce more NOx emissions, and the substitution ratio is important to the emissions.