论文标题
氧甲基醚（预兆，n = 2-4） /乙烯预混合火焰中的颗粒形成
Particle formation in oxymethylene ethers (OMEn, n = 2-4) / ethylene premixed flames
论文作者
论文摘要
替代合成燃料可以通过可再生能源产生，并代表了解决长期储能的潜在途径。其中，含氧燃料具有显着降低污染物排放的优势，因此可以用作运输碳中性替代燃料。在这项工作中，在轻度至严重的烟雾条件下，使用一系列燃烧器稳定的预防火焰对不同氧甲基醚（预兆）的烟雾倾向进行了研究。在此，比较了乙烯与n = 2-4的三个单独兆头的混合物，根据纯乙烯火焰的烟灰形成行为进行了比较。 Sun等人的动力学机制。 （Proc。Coldust。Inst。36，1269-1278，2017）用于氧甲基乙醚预兆，n = 1-3扩展到包括Ome4分解和燃烧动力学。在数值模拟中，动力学机制与详细的四烟烟灰模型结合使用，该模型使用了矩的条件正交方法，并用激光诱导的荧光（LIF）和激光诱导的隐染（LII）测量进行了验证。可以观察到，n = 2-4的三个研究预兆显示出相似的掩盖行为，主要减少较大的聚集体，同时没有显着影响较小颗粒的形成。此外，在这三个兆头之间，烟灰减少的程度是可比的。该模型很好地捕获了趋势和总体减少。通过反应路径分析和敏感性研究对建模结果进行了分析，该研究表明，在这些丰富条件下，预兆分解和CH2O的形成以减少与烟灰形成相关的物种。这是可以忽略的观察到的烟灰形成的差异的基础。
Alternative synthetic fuels can be produced by renewable energy sources and represent a potential route for solving long-term energy storage. Among them, oxygenated fuels have the advantage of significantly reducing pollutant emissions and can therefore be used as carbon-neutral substitute fuels for transportation. In this work, the sooting propensity of different oxymethylene ethers (OMEn) is investigated using a combined experimental and numerical study on a series of burner-stabilized premixed flames under mild to severe sooting conditions. Herein, mixtures of ethylene in combination with the three individual OMEn for n=2-4 are compared in terms of soot formation behavior with pure ethylene flames. The kinetic mechanism from Sun et al. (Proc. Combust. Inst. 36, 1269-1278, 2017) for oxymethylene ether OMEn combustion with n=1-3 is extended to include OME4 decomposition and combustion kinetics. In the numerical simulations, the kinetic mechanism is combined with a detailed quadvariate soot model which uses the Conditional Quadrature Method of Moments and validated with Laser-Induced Fluorescence (LIF) and Laser-Induced Incandescence (LII) measurements. It is observed, that the three investigated OMEn with n=2-4 show similar sooting behavior, mainly reducing larger aggregates while not significantly affecting the formation of smaller particles. Furthermore, the extent of soot reduction is comparable among the three OMEn. The trends and overall reduction are very well captured by the model. The modeling results are analyzed through reaction path analyses and sensitivity studies which show the important role of OMEn decomposition and the formation of CH2O under these rich conditions to reduce species relevant for soot formation. This is at the base of the negligible observed differences in terms of soot formation for the different OMEn fuels.
