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首页> 外文期刊>Atomization and Sprays: Journal of the International Institutes for Liquid Atomization and Spray Systems >NUMERICAL INVESTIGATION OF A STRATIFIED CHARGE COMPRESSION IGNITION ENGINE WITH LATE INJECTION UNDER LOW-LOAD NONCOMBUSTING CONDITIONS
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NUMERICAL INVESTIGATION OF A STRATIFIED CHARGE COMPRESSION IGNITION ENGINE WITH LATE INJECTION UNDER LOW-LOAD NONCOMBUSTING CONDITIONS

机译：低负荷不燃烧条件下带迟滞喷射的分层装药压缩点火发动机的数值研究

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摘要

Fuel stratification introduced by direct injection (DI) of isooctane in an optically accessible stratified charge compression ignition (SCCI) engine is numerically investigated using a multidimensional model. The study is motivated by the fact that in homogeneous charge compression ignition (HCCI) engines operated at low load, combustion efficiency is rather low and the associated carbon monoxide (CO) and unburned hydrocarbons (UHC) emissions are quite high but that this can be improved by fuel stratification using DI. The resulting in-cylinder mixture distribution is crucial to the success of this strategy. Regions that are too rich cause high NO infinity while fuel in regions that are too lean results in deteriorated combustion efficiency and OC/UHC emissions. Methods to predict the fuel distribution are therefore required. This study aims to determine the extent to which a computational fluid dynamics (CFD) model can predict fuel stratification in SCCI engines and determine whether the predicted in-cylinder fuel and temperature distributions can explain emissions trends with different stratification levels. The model is shown to have quantitatively good agreement with experimental measurements of the fuel distributions for various injection timings under nonfiring conditions this is apparently among the first such demonstrations in SCCI operating conditions. It is found that with more retarded injection timing, fuel is increasingly concentrated in the central regions, leading to potential improvements of combustion efficiency and reduction of CO and UHC. However, nitrogen oxides can be potentially increased due to the appearance of regions with excessively high equivalence ratios. The creation of high equivalence ratio regions was examined and it was found that spray-to-spray interaction and spray-wall interaction play important roles in mixture formation. The sensitivity to model parameters was also examined.
机译：使用多维模型数值研究了异辛烷的直接喷射（DI）在光学可访问的分层充气压缩点火（SCCI）发动机中引入的燃料分层。该研究的动机是，在低负荷下运行的均质压燃式（HCCI）发动机中，燃烧效率相当低，并且相关的一氧化碳（CO）和未燃烧的碳氢化合物（UHC）排放量很高，但是可以通过使用DI进行燃料分层改善了性能。缸内混合物的最终分布对于该策略的成功至关重要。太浓的区域会导致NO无限大，而太稀的区域的燃料则会导致燃烧效率和OC / UHC排放降低。因此需要预测燃料分布的方法。这项研究旨在确定计算流体力学（CFD）模型可以预测SCCI发动机中燃料分层的程度，并确定预测的缸内燃料和温度分布是否可以解释具有不同分层水平的排放趋势。结果表明，该模型与非点火条件下各种喷射正时的燃料分布的实验测量在数量上具有良好的一致性，这显然是SCCI运行条件下的首次此类演示。发现随着喷射正时的延迟，燃料越来越集中在中心区域，从而导致燃烧效率的潜在改善以及CO和UHC的减少。但是，由于出现了当量比过高的区域，氮氧化物可能会增加。检查了高当量比区域的产生，并且发现喷雾与喷雾的相互作用和喷雾壁的相互作用在混合物形成中起重要作用。还检查了对模型参数的敏感性。

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