发动机燃用柴油时无法避免颗粒物排放。甲醇含氧量高，燃烧过程中不产生碳烟，可以消除发动机燃料产生的颗粒排放。但甲醇十六烷值低，在柴油机上直接喷雾压缩燃烧利用难度较大。本申请旨在寻找一种"火种"型十六烷值改进剂以提高甲醇燃料的自燃性。利用快速压缩机产生高温高压来模拟发动机燃烧室环境，结合平面激光诱导荧光(PLIF)技术，进行甲醇的喷雾与自燃特性和十六烷值改进剂及环境、燃油喷射等条件对其影响规律的研究。在此基础上，结合甲醇燃烧详细化学反应机理与喷雾CFD数值模拟，揭示甲醇喷雾自燃过程中物理与化学滞燃期的详细发展历程，阐明十六烷值改进剂对甲醇自燃的作用机制，指明新型"火种"型十六烷值改进剂的研究方向，为现代电控柴油机直接燃用纯甲醇奠定理论基础。此不但为降低柴油机颗粒排放，满足国VI及以上排放法规提供技术指导，也为我国内燃机的研究与开发、实现能源多样化及建设清洁高效型社会具有重要意义。

The PM (particulate matter) emissions of compression ignition engine can not be completely eliminated when fueled with diesel oil. Methanol is high of oxygen and none of carbon bond in molecular and thus gives smokeless combustion; when it's utilized on internal combustion engine, the fuel-originated PM emission could be avoided. However, the low cetane number prohibits methanol from utilizing on diesel engine in form of incylinder spray compression ignition. Aiming at finding a igniter-style cetane number improver to enhance methanol's autoigniton ability. The high temperature and pressure circumstance in the diesel engine chamber is simulated by a fast compressor; the spray and autoignition characteristics, and the influence of cetane number improver, the effect of circumstance, fuel composition and injection parameters on the characteristics, are experimentally studied with planar laser induced fluorescence (PLIF) flame combustion analyzing system. Based on the experiments, the detailed developing processed of physical and chemical ignition delay duration of methanol spray autoignition and the function mechanism of cetane number improver on the autoignition are numerically studied by combining with detailed chemical reaction mechanism of methanol combustion and spray modeling. So as to specify the research direction of the new cetane number improver, establish the theoretical base for utilizing methanol like diesel on modern electric controlled diesel engine. The study is not only meaningful for diesel engine to reduce PM emission, and thus fulfill the more and more stringent emission standard limits, to improve the thermal efficiency, and to completely substitute diesel fuel with methanol, but also essential for the research and exploration of internal combustion engine, realization of energy diversification, and the construction of a clean and efficient society.