Macroscopic spray characteristics of next-generation bio-derived diesel fuels in comparison to mineral diesel
Macroscopic spray characteristics of next-generation bio-derived diesel fuels in comparison to mineral diesel
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DOI：
10.1016/j.apenergy.2016.10.082
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发表时间：
2017-01
期刊：
影响因子：
11.2
通讯作者：
T. Bohl;G. Tian;A. Smallbone;A. Roskilly
中科院分区：
文献类型：
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作者：
T. Bohl;G. Tian;A. Smallbone;A. Roskilly
采用定容喷雾装置，以矿物柴油（B0）为基准，研究了加氢植物油（HVO）、棕榈油甲酯（PME）、大豆油甲酯（SME）和废食用油甲酯（UCOME）4种新一代生物燃料的宏观喷雾特性。在实验期间，燃料被加热到80 °C以在各种压缩点火发动机相关操作条件下喷射之前实现类似发动机的环境。通过对直接摄影技术获得的图像进行分析，研究了燃油喷雾尖端贯穿距离、喷雾锥角和喷雾面积。此外，提出了一种改进的喷雾模型，通过将燃料密度作为喷雾模型的一部分，将其范围扩大到包括替代燃料。结果表明，HVO燃料密度最小，穿透距离最短，锥角最大，油气混合更加均匀。对于相同的喷射条件，所有燃料具有非常相似的喷雾面积，但HVO的单位喷射质量的比喷雾面积最高，其次是三种甲酯。结果表明，燃油粘度是影响混合过程的重要因素。喷雾特性与我们的发动机测试结果进行了比较，可以用来解释观察到的发动机行为时，与生物燃料。
In this paper, the macroscopic spray characteristics of four next-generation biofuels, namely, hydrotreated vegetable oil (HVO), Palm oil methyl ester (PME), Soybean oil methyl ester (SME) and used cooking oil methyl ester (UCOME) were investigated in detail using a constant volume spray vessel, and benchmarked against reference mineral diesel (B0). During experiments, fuels were heated to 80 °C to achieve an engine-like environment before being injected at various compression ignition engine relevant operating conditions. The fuel spray tip penetration, spray cone angle and spray area were investigated analysing images obtained using a direct photography technique. Furthermore, a modified spray model was proposed to extend its scope to include alternative fuels by considering fuel density as part of the spray model. The results show that HVO with the lowest density of all fuels achieves the shortest penetration distance and the highest cone angle, resulting in a more distributed fuel-air mixture. All fuels have very similar spray areas for the same injection conditions, but the specific spray area per injected mass is highest for HVO followed by the three methyl esters. It was concluded that the fuel liquid viscosity was a significant factor on the observed air-fuel mixing process. The spray characteristics were compared with our engine test results and can be used to explain observed engine behaviour when fuelled with biofuels.