Abundant alcohols, including ethanol, propanol, butanol, and pentanol, are expected to be used in compression ignition engines to ease the shortages of fossil fuel. The various alcohols have quite a different combustion and emission characteristics in the engine due to the changes in molecular structures. In this paper, a series of experiments were conducted on a modified common-rail diesel engine fueled with diesel/alcohols blended fuels in a wide operating range. The effects of alcohol chain length, oxygen content, and molecular structure on engine combustion and emission characteristics are studied systematically. The experimental results show that the blending of alcohols increases the peak values of in-cylinder pressure and maximum pressure rising rate. Besides, the combustion duration and ignition delay are mainly affected by oxygen content and isomer structure. The addition of short-chain alcohols will significantly reduce the total mass of particulate matter (PM) emissions, while the CO and HC emissions increase appropriately. The CO, HC, aldehydes, and ethylene emissions are mainly affected by carbon chain length and isomer structure. For PM emissions, the carbon chain length, molecular structure, and oxygen content of alcohol fuels have different influences on PM number, PM mass, and particle size distributions. The shorter carbon chain of alcohol leads to smaller particle size, and higher oxygen content leads to lower total particle mass.

乙醇、丙醇、丁醇和戊醇等丰富的醇类有望用于压燃式发动机，以缓解化石燃料的短缺。由于分子结构的变化，各种醇在发动机中具有截然不同的燃烧和排放特性。在本文中，对使用柴油/酒精混合燃料的改进型共轨柴油发动机在较宽的工作范围内进行了一系列实验。系统研究了醇链长度、氧含量和分子结构对发动机燃烧和排放特性的影响。实验结果表明，醇类的掺混提高了缸内压力的峰值和最大升压速率。除了，燃烧持续时间和点火延迟主要受氧含量和异构体结构的影响。短链醇的加入将显着降低颗粒物（PM）排放总量，同时CO和HC排放量适当增加。CO、HC、醛类和乙烯的排放主要受碳链长度和异构体结构的影响。对于 PM 排放，醇类燃料的碳链长度、分子结构和氧含量对 PM 数量、PM 质量和粒度分布有不同的影响。醇的碳链越短，粒径越小，氧含量越高，总颗粒质量越低。而 CO 和 HC 的排放量适当增加。CO、HC、醛类和乙烯的排放主要受碳链长度和异构体结构的影响。对于 PM 排放，醇类燃料的碳链长度、分子结构和氧含量对 PM 数量、PM 质量和粒度分布有不同的影响。醇的碳链越短，粒径越小，氧含量越高，总颗粒质量越低。而 CO 和 HC 的排放量适当增加。CO、HC、醛类和乙烯的排放主要受碳链长度和异构体结构的影响。对于 PM 排放，醇类燃料的碳链长度、分子结构和氧含量对 PM 数量、PM 质量和粒度分布有不同的影响。醇的碳链越短，粒径越小，氧含量越高，总颗粒质量越低。