Numerical studies of gasoline direct-injection sprays (ECN Spray G) under early- and late-injection conditions using Large Eddy Simulation and droplets-statistics-based Eulerian–Lagrangian framework
Numerical studies of gasoline direct-injection sprays (ECN Spray G) under early- and late-injection conditions using Large Eddy Simulation and droplets-statistics-based Eulerian–Lagrangian framework
复制标题
使用大涡模拟和基于液滴统计的欧拉-拉格朗日框架对早期和晚期喷射条件下的汽油直喷喷雾（ECN Spray G）进行数值研究
DOI：
10.1016/j.fuel.2023.129708
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发表时间：
2019
期刊：
影响因子：
7.4
通讯作者：
Christian Hasse
中科院分区：
文献类型：
--
作者：
Hao;Yongxiang Li;Andrea Pati;A. Sadiki;Christian Hasse
本文提出了一种在欧拉-拉格朗日框架下使用大涡模拟来模拟发动机燃烧网络（ECN）多孔和沉孔喷油器的汽油直喷（GDI）喷雾的方法。该方法考虑了由于沉孔配置而导致的空化在初级雾化中所起的重要作用。 GDI 喷雾的局部韦伯数 (We) 和雷诺数 (Re) 比柴油喷雾的小得多，这使得传统的柴油喷雾方法不适合。所提出的方法使用基于统计的液滴分布函数来解决这个问题，并结合了来自 DNS 内部喷嘴流模拟的必要信息。相应的阻力、传热、蒸发和破碎模型考虑了粘性和扭曲喷雾液滴的影响。该方法已应用于两种不同的操作条件，仿真结果与实验数据非常吻合。与假设喷射液滴大小为喷射器直径的斑点方法相比，所提出的 CFD 框架可以在 Spray G3 情况下重现更准确的羽流形状。与斑点方法相比，应用后期喷射条件（Spray G1），所提出的方法通过提供更准确的液滴蒸发预测来改善预计液体体积（PLV）消光。这些发现证明了所提出的 GDI 喷雾建模方法的重要性，并强调了其在该领域未来研究的潜力。
This paper presents an approach that uses Large Eddy Simulation under the Eulerian–Lagrangian framework to model the gasoline direct-injection (GDI) spray from Engine Combustion Network (ECN) multi-hole and counter-bore injectors. The approach considers the significant role that cavitation plays in primary atomization due to the counter-bore configuration. The local Weber number (We) and Reynolds number (Re) for GDI sprays are much smaller than those for a diesel spray, which renders conventional diesel spray approaches unsuitable. The proposed one uses a statistics-based droplet distribution function to address this and incorporates necessary information from a DNS inner-nozzle flow simulation. The corresponding models for drag, heat transfer, evaporation, and breakup consider the effects of viscous and distorted spray droplets. The approach has been applied to two different operating conditions, with simulation results that agree well with experimental data. Compared to the blob method assuming the ejected droplets are at the size of the injector diameter, the proposed CFD framework can reproduce a more accurate plume shape in the Spray G3 case. Applying the late-injection condition (Spray G1), the proposed approach improves the projected liquid volume (PLV) extinction compared to the blob method by providing a more accurate droplet evaporation prediction. These findings demonstrate the significance of the proposed approach for modeling GDI sprays and highlight its potential for future research in this area.
影响因子：
7.4
作者：
Joonsik Hwang;L. Weiss;I. Karathanassis;P. Koukouvinis;L. Pickett;S. Skeen
通讯作者：
Joonsik Hwang;L. Weiss;I. Karathanassis;P. Koukouvinis;L. Pickett;S. Skeen