Investigating Ethanol-Gasoline Spray Characteristics Using an Interferometric Drop Sizing Technique
Investigating Ethanol-Gasoline Spray Characteristics Using an Interferometric Drop Sizing Technique
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DOI：
10.1115/gt2019-91421
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发表时间：
2019-11
期刊：
影响因子：
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通讯作者：
H. Davies;M. Talibi;M. Hyde;R. Balachandran
中科院分区：
文献类型：
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作者：
H. Davies;M. Talibi;M. Hyde;R. Balachandran
为了减少对化石燃料的依赖，全球都在努力减少燃料消耗，并使用生物衍生燃料。在使用液体燃料的实际燃烧系统中，观察这些生物燃料的喷雾行为是了解燃料性能的关键;特别是，液滴尺寸分布已知对燃料能量释放和污染物形成过程具有强烈影响。本文旨在使用TSI全球尺寸测速（GSV）干涉技术作为一种方法，以获得详细的了解液滴的数量和尺寸分布，特别关注乙醇-汽油燃料混合物。用于GSV技术的成像系统由Nd：YAG激光器和4 MP（百万像素）照相机组成，并且喷雾使用通用汽车端口燃料喷射器产生。结果表明，GSV技术是能够有效地测量液滴浓度和直径的所有燃料混合物在这项研究中测试。与化石汽油相比，观察到乙醇具有更大的液滴直径（D10和D32），液滴直径通常随着乙醇在汽油中的比例增加而增加。液滴浓度随着距喷雾中心线径向距离的增加而减小，但随着距喷嘴尖端的轴向位移而没有观察到明显的变化。对于乙醇含量小于40%的燃料混合物，观察到图像质量的劣化。使用单分散液滴发生器验证GSV液滴尺寸测量，并且观察到极好的一致性（在2%以内）。
To reduce reliance on fossil fuels there has been a global push to minimise fuel consumption, and incorporate the use of bio-derived fuels. In practical combustion systems that use liquid fuels, observing the spray behaviour of these biofuels is key in understanding fuel performance; in particular, droplet size distribution is known to have a strong influence on the fuel energy release and pollutant formation processes. This paper is aimed at the use of the TSI Global Sizing Velocimetry (GSV) interferometric technique as a method to gain detailed understanding of droplet number and size distribution, with a particular focus on ethanol-gasoline fuel blends. The imaging system for the GSV technique consisted of a Nd:YAG laser and a 4 MP (million pixel) camera, and the spray was generated using a generic automotive port fuel injector. The results showed that the GSV technique was able to effectively measure droplet concentration and diameters for all the fuel blends tested in this study. Ethanol was observed to have larger droplet diameters (both D10 and D32) as compared to fossil gasoline, with droplet diameters generally increasing as the proportion of ethanol in the gasoline was increased. The droplet concentration reduced with increasing radial distance from the spray centreline, but no appreciable change was observed with axial displacement from the nozzle tip. Degradation in the image quality was observed for fuel blends with less than 40% ethanol content. The GSV drop sizing measurements were validated using a mono-disperse droplet generator, and an excellent agreement (within 2%) was observed.