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首页> 外文期刊>Fuel >Neat polyoxymethylene dimethyl ether in a diesel engine; part 1: Detailed combustion analysis
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Neat polyoxymethylene dimethyl ether in a diesel engine; part 1: Detailed combustion analysis

机译：柴油发动机中的纯聚甲醛二甲醚；第1部分：详细的燃烧分析

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摘要

Oxygenated fuels have already shown potential to be used in Diesel engines without major modifications. Polyoxymethylene dimethyl ether (POMDME, short OME) offers particular characteristics (i.e. no C-C bonds, high cetane number, high potential to reduce greenhouse gases, when produced with renewable energy, etc.) which are favourable to be combusted in a standard Diesel engine and allow the potential to overcome the classical NOx-PM trade off. In order to capture the full potential of this fuel, its combustion characteristics under diesel engine conditions need to be investigated.In the present work the combustion behaviour of neat OME in a composition of approximately 80% OME3 and 20% OME4 has been investigated. For the measurement campaign, a heavy duty single cylinder research engine was used. For the operation with OME, the eight injector nozzle holes were increased from 0.24 mm to 0.29 mm. The operating conditions included variations in fuel, nozzle size, EGR, boost pressure and load. A significant number of operating conditions with OME have been investigated under stoichiometric global air/fuel ratio conditions.It was observed that the ignition delay of OME is shorter than the one of Diesel, due to the higher cetane number of the oxygenated fuel. Moreover OME showed a faster combustion. The reason for this fast combustion behaviour has not been found in the lower demand on air directly, but mainly in the higher turbulence level for mixing due to combustion closer to the injector nozzle tip as a result of the lower oxygen demand. A computationally fast description for steady state sprays has been used to express a characteristic time scale which is required for the fuel to mix with surrounding air up to stoichiometric conditions. The resulting characteristic number tau(spray) correlates well with the characteristic mixing rate tau(mix), calculated from the measurement data. This description offers the possibility to predict the diffusion combustion rate in a very wide range of engine operation parameter variations, including changes in nozzle size, fuel injection pressure or fuel composition with strongly air demand.
机译：含氧燃料已经显示出无需重大改动即可用于柴油发动机的潜力。聚甲醛二甲醚（POMDME，缩写为OME）具有特殊的特征（例如，没有CC键，十六烷值高，当使用可再生能源生产时具有很高的减少温室气体的潜力等），适合在标准柴油机和柴油机中燃烧。可以克服经典的NOx-PM折衷方案。为了充分利用这种燃料，需要研究其在柴油发动机工况下的燃烧特性。在本工作中，研究了纯OME在约80％OME3和20％OME4成分中的燃烧行为。为了进行测量，使用了重型单缸研究引擎。对于OME的操作，八个喷油嘴孔从0.24毫米增加到0.29毫米。运行条件包括燃料，喷嘴尺寸，EGR，增压压力和负载的变化。在化学计量的全球空燃比条件下，已经研究了OME的许多运行条件。观察到，由于含氧燃料的十六烷值更高，OME的点火延迟比柴油机的点火延迟更短。而且，OME显示出更快的燃烧。这种快速燃烧行为的原因尚不能直接基于对空气的较低需求而找到，而主要是由于较低的氧气需求，由于燃烧更接近喷射器喷嘴尖端而导致较高的混合湍流水平。稳态喷雾的计算快速描述已用于表示特征时间标度，该特征时标是燃料与周围空气混合直至化学计量条件所需的。所得的特征数tau（spray）与根据测量数据计算出的特征混合率tau（mix）很好地相关。该描述提供了在非常广泛的发动机操作参数变化范围内预测扩散燃烧率的可能性，包括在强烈的空气需求下喷嘴尺寸，燃料喷射压力或燃料成分的变化。

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