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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Entropy Analysis of Microscopic Diffusion Phenomena in Diesel Sprays
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Entropy Analysis of Microscopic Diffusion Phenomena in Diesel Sprays

机译：柴油机喷雾微观扩散现象的熵分析

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摘要

Rapid mixing of fuel and air is an essential factor in improving combustion and emissions of diesel engines, and it is important to know the relationship between the microscopic structure of the heterogeneous distribution of fuel clouds and the local turbulence structure. This paper investigates local diffusion phenomena in sprays with focusing on scales of fuel cloud and eddies based on a newly developed entropy method. The results show that the diffusion intensity is the highest in the vicinity of the nozzle exit, and the heterogeneity scale is the smallest here. The heterogeneity scale increases gradually along the spray axis towards the downstream, with smaller size scales in the large clouds. In the downstream region, small-scale structures diffuse and become unclear, while large scale structures clearly remain. The paper details the microscopic structure of the heterogeneity in diesel sprays, and it demonstrates availability of the entropy method.
机译：燃料和空气的快速混合是改善柴油机燃烧和排放的重要因素，了解燃料云的非均匀分布的微观结构与局部湍流结构之间的关系非常重要。本文基于一种新开发的熵方法，研究了喷雾中的局部扩散现象，重点研究了燃料云和涡流的尺度。结果表明，在喷嘴出口附近扩散强度最高，而异质性尺度最小。异质性尺度沿着喷雾轴向下游逐渐增加，大云中的尺度较小。在下游区域，小规模的结构会扩散并变得不清晰，而大型结构则明显保留。本文详细介绍了柴油喷雾中异质性的微观结构，并证明了熵方法的可用性。

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