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首页> 外文期刊>Energy Conversion & Management >Multi-zone modeling of combustion and emissions formation in DI diesel engine operating on ethanol-diesel fuel blends
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Multi-zone modeling of combustion and emissions formation in DI diesel engine operating on ethanol-diesel fuel blends

机译：使用乙醇-柴油混合燃料的DI柴油机燃烧和排放形成的多区域建模

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A multi-zone model for calculation of the closed cycle of a direct injection (DI) diesel engine is applied for the interesting case of its operation with ethanol-diesel fuel blends, the ethanol (bio-fuel) being considered recently as a promising extender to petroleum distillates. Although there are many experimental studies, there is an apparent scarcity of theoretical models scrutinizing the formation mechanisms of combustion generated emissions when using bio-fuels. This is a two dimensional, multi-zone model with the issuing fuel jets divided into several discrete volumes, called 'zones', formed along and across the direction of the fuel injection. The model follows each zone, with its own time history, as the spray penetrates into the swirling air environment of the combustion chamber. Droplet evaporation and jet mixing models are used to determine the amount of fuel and entrained air in each zone available for combustion. The mass, energy and state equations are applied in each zone to provide local temperatures and cylinder pressure histories. The concentrations of the various constituents are calculated by adopting a chemical equilibrium scheme for the C-H-O-N system of eleven species considered, together with chemical rate equations for calculation of nitric oxide (NO) and a model for net soot formation. The results from the computer program, implementing the analysis, for the in cylinder pressure, exhaust NO concentration and soot density compare well with the corresponding measurements from an experimental investigation conducted on a fully automated test bed, standard 'Hydra', DI diesel engine located at the authors' laboratory, which is operated with ethanol-diesel fuel blends containing 5%, 10% and 15% (by vol.) ethanol. Iso-contour plots of equivalence ratio, temperature, NO and soot inside the cylinder at various instants of time, when using these ethanol-diesel fuel blends against the diesel fuel (baseline fuel), shed light on the mechanisms underlying the combustion and pollutants formation. They reveal how the widely differing properties of ethanol in these blends, against the normal diesel fuel, affect greatly the combustion mechanism and the related emitted pollutants.
机译：一种用于计算直喷式（DI）柴油机闭环的多区域模型，适用于其与乙醇-柴油混合燃料运行的有趣情况，最近，乙醇（生物燃料）被认为是有希望的扩展剂石油馏分。尽管有许多实验研究，但在审查使用生物燃料时燃烧产生的排放物形成机理的理论模型显然缺乏。这是一个二维的多区域模型，将发出的燃料射流分成几个离散的体积，称为“区域”，沿着和横跨燃料喷射的方向形成。当喷雾渗透到燃烧室的旋转空气环境中时，该模型遵循每个区域的时间历史。液滴蒸发和喷射混合模型用于确定每个区域中可燃烧的燃料和夹带的空气量。质量，能量和状态方程式应用在每个区域中，以提供局部温度和气缸压力历史记录。通过为所考虑的11个物种的C-H-O-N系统采用化学平衡方案，用于计算一氧化氮（NO）的化学速率方程式和用于净烟灰形成的模型，来计算各种成分的浓度。来自计算机程序的结果（实施分析）对缸内压力，排气中NO浓度和烟灰密度进行了分析，并与在全自动测试台（标准“ Hydra”，DI柴油发动机）上进行的实验研究的相应测量结果进行了比较在作者的实验室中进行操作，该实验室使用的乙醇-柴油混合燃料含量为5％，10％和15％（按体积计）。当这些乙醇-柴油混合燃料与柴油燃料（基准燃料）一起使用时，在不同的时间点，气缸内的当量比，温度，NO和烟尘的等值线图阐明了燃烧和污染物形成的机理。他们揭示了这些混合物中的乙醇与普通柴油相比，其广泛不同的特性如何极大地影响燃烧机理和相关的排放污染物。

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