DMM燃料柴油机可控预混合燃烧的研究

本文介绍了在压燃式发动机上进行的预混合燃烧研究。在柴油机的进气道入口处安装了一个电控燃料喷射系统,喷入具有低十六烷值、低沸点的甲缩醛(DMM)燃料,在压缩冲程中形成均匀的混合气,并在上止点附近喷入少量柴油来点燃混合气。本文研究了预混合燃料比、发动机负荷、进气中CO2浓度和喷孔直径对发动机燃烧和排放的影响。试验结果表明,进气道喷射DMM的预混合燃烧能同时大幅降低NOx和碳烟排放,为降低柴油机有害排放提供了一种新途径。

STUDY OF CONTROLLABLE PREMIXED COMBUSTION IN DIESEL ENGINE FUELED WITH DMM

This paper presents a study of premixed combustion in a CI engine. An electrically controlled fuel injection system was installed in the intake manifold of the engine. Dimethoxymethane(DMM) fuel with low cetane number and low boiling point was injected into the manifold. The homogeneous mixture was formed in the compression stroke and ignited by a small amount of injected diesel fuel near the TDC. The effects of pre-mixed fuel ratio, engine load, CO2 concentration in the intake gas and nozzle hole diameter on the engine combustion and emissions were investigated. The results show that The premixed combustion by DMM fuel port injection exhibits substantial reduction of NOx and smoke emissions simultaneously, which may possible develop into a technique for controlling diesel engine exhaust emissions.