大分子液体燃料掺烧含氧燃料时，碳烟HACA演化机制不够准确，不能指导柴油机应用含氧燃料降低颗粒物实践。本项目拟研究不同含氧燃料结构对碳烟生成的影响，采用自发光诊断、激光诊断、柴油机台架等手段与数值模拟结合的方法，系统研究柴油掺烧含氧燃料影响碳烟生成氧化的机制。主要内容包括：1)在基础火焰的光学诊断和基于HACA机制以及含氧燃料燃烧机制的数值模拟等基础上，研究柴油替代燃料掺烧大分子含氧燃料后，含氧燃料碳氢结构通过C3~5等不饱和烃中间产物影响碳烟生成的机制。2)基于光学诊断、数值模拟和含氧基团分析，研究含氧燃料含氧官能团影响碳烟生成的一般规律。3)通过柴油机台架试验、数值模拟和实验设计，研究含氧燃料化学结构和物性参数影响碳烟生成和PM排放的机制。本研究对于揭示含氧燃料理化特性对碳烟生成的影响和作用机理有重要理论意义，对从广泛的原料和理化特性中寻找有利降低碳烟排放的含氧燃料有实际工程指导价值。

The HACA evolution mechanism of soot can’t provide accurate guidance on the practice of particulate matters reduction by using oxygenated fuels in diesel engine，when blending liquid fuel with oxygenate fuels. In this project we will focus on verifying the effects of oxygenated fuels molecular structure on soot formation. In order to systematically investigate the mechanisms of the diesel and oxygenated blended fuels on soot formation and oxidation, advanced optical diagnostics, numerical simulation and engine bench test will be conducted. The main contents include: 1) On the basis of optical diagnosis of basic flames, HACA mechanism and oxygenated fuel combustion mechanism, the study about influence mechanisms of hydrocarbon structure of oxygenated fuel on soot formation by means of intermediate products of C3-C5 unsaturated hydrocarbons will be carried out. 2) Based on optical diagnostics, numerical simulation and oxygenous groups analysis, the general law of oxygen functional group of oxygenated fuels on soot formation will be studied. 3) Employing engine bench test, numerical simulation and experimental design, the influence mechanisms of chemical structural characteristics and physical parameters of oxygenated fuels on soot formation and PM emission will be investigated. This research has important theoretical significance on revealing the influence and mechanism of physical and chemical properties of oxygenated fuels on soot formation. In addition, it also has practical engineering guidance for seeking the oxygenated fuel contributed to soot reduction from a wide range of feedstock and physicochemical properties.