聚甲氧基二甲醚类燃料的喷雾燃烧基础研究

Polyoxymethylene Dimethyl Ethers (PODEn) produced from coal have been considered as promising alternate fuel candidates since the breakthroughs in the high-efficiency production method. It is also noticed that PODEn fuels have potentials in soot reduction due to their oxygen contents. This project aims a comprehensive research on diffusion combustion characterizes of PODEn fuels and their blends with diesel as alternate fuels in compression ignition engines. Optical diagnostics will be used to investigate the combustion and soot formation process. The project is consist of the following tasks: (1) A fundamental study in the spray characteristics of PODE2-5 and their blends with diesel; (2) Diffusion combustion and soot formation studies of PODE2-5 and their blends with diesel in a high pressure/temperature constant volume vessel, which uses LEM-LII method to investigate the formation and the distribution of soot, and reveals the impact of the oxygen contents and molecular structures on the combustion and products;(3) Improving the calibration and image-matching models and algorithms for a higher accuracy in LII tests; (4) LII and two-color method study on the combustion of the mentioned fuels in an optical engine to understand the feature of combustion and soot formation. This project will look into the fundamental spray and combustion characteristics and the soot-formation mechanism of the new alternate fuel candidates, providing fundamental knowledge for a potential direction in future R&D of clean and high-efficiency engines.

基于煤炭来源的煤基燃料聚甲氧基二甲醚(PODEn)大规模制取工艺目前已实用化,PODE2-5作为发动机替代燃料的可能性受到重视,此外它们在抑制碳烟排放方面也有显著潜力。本项目以聚甲氧基二甲醚类物质作为替代燃料(单质或与柴油掺混)在压燃模式下的喷雾燃烧为主要研究对象,对燃料燃烧与碳烟生成特性开展光学诊断基础研究。具体内容包括:研究PODE2-5及掺混燃料的喷雾宏观与微观特性;在高温高压定容弹中实施PODE2-5单质以及不同掺混方案的喷雾燃烧试验,采用LII-消光法等手段定量研究碳烟生成、分布的情况,解析含氧量和分子结构等因素对燃烧和碳烟生成的影响规律;改进LII试验标定校正模型算法;在光学发动机上采用LII和双色法研究前述燃料的缸内燃烧和碳烟排放特性.本项目旨在探索新型替代燃料的燃烧特性和碳烟生成机理,为发动机节能减排研究中一个较有潜力的方向奠定理论和技术基础。

基于煤炭来源的煤基燃料聚甲氧基二甲醚(PODEn)的大规模制取工艺目前已实用化,PODEn作为发动机替代燃料的可能性受到重视,此外它们在抑制碳烟排放方面也有显著潜力。本项目以聚甲氧基二甲醚类物质 (单质或与柴油掺混)在压燃模式下的喷雾燃烧为主要研究对象,对燃料燃烧与碳烟生成特性开展光学诊断基础研究。具体内容包括:研究PODEn及掺混燃料的喷雾宏观与微观特性;在高温高压定容弹中开展PODEn以及不同掺混方案的喷雾燃烧试验,采用LII-消光法等手段定量研究碳烟生成、分布的情况,解析含氧量和分子结构等因素对燃烧和碳烟生成的影响规律;改进LII试验标定校正模型算法;在光学发动机上研究前述燃料的缸内燃烧和碳烟排放特性。本项目旨在探索新型替代燃料的燃烧特性,为发动机节能减排研究中一个较有潜力的方向奠定理论和技术基础。