Spray characteristics of diesel and derivatives in direct injection diesel engines with varying injection pressures
Spray characteristics of diesel and derivatives in direct injection diesel engines with varying injection pressures
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DOI：
10.1007/s12206-015-0945-9
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发表时间：
2015-10
影响因子：
1.6
通讯作者：
R. Palani;N. Nallusamy;K. Pitchandi
中科院分区：
文献类型：
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作者：
R. Palani;N. Nallusamy;K. Pitchandi
非食用油及其衍生物的燃烧和排放特性与矿物柴油有很大不同；特别是，非食用油及其衍生物具有较高的分子、相对密度和汽化特性。这些特性对燃料喷雾以及该喷雾与燃烧室中空气的相互作用产生很大影响。因此，有必要检查喷雾特性，包括喷雾锥角、喷雾尖端穿透度、喷雾面积和燃油雾化。燃油的喷雾特性主要取决于燃油喷射压力、密度、粘度、环境压力和温度。在这些参数中，喷油压力对喷雾结构影响显着。本研究以柴油、麻风树油甲酯、卡兰加油甲酯和两种生物柴油混合燃料（JB20和KB20）作为燃料，在不同喷射压力的柴油机上进行了实验。用于喷雾可视化和图像处理的光学技术是分析被测燃料喷雾参数的非常有效的工具。宏观喷雾特性，如喷嘴穿透力、喷雾锥角和喷雾面积，是从高速摄像机捕获的图像中获取的。还估计了所有测试燃料的索特平均直径和喷雾量。实验结果表明，生物柴油混合物表现出与柴油不同的特性。 KB100 具有最高的喷嘴穿透力和喷雾面积，其次是 JB100、JB20、KB20 和柴油。柴油显示出最佳的喷雾参数，其次是 JB20、KB20、KB100 和 JB100。所测试的燃料在较高喷射压力下比在较低喷射压力下表现出更好的喷雾特性。
The combustion and emission characteristics of inedible oils and their derivatives are quite different from those of mineral diesel; in particular, inedible oils and their derivatives present higher molecular, relative density, and vaporization characteristics. These properties exert great impacts on the fuel spray as well as the interactions of this spray with air in the combustion chamber. Thus, examining spray characteristics, including spray cone angle, spray tip penetration, spray area, and fuel atomization, is necessary. The spray characteristics of fuel mainly depend on the fuel injection pressure, density, viscosity, ambient pressure, and temperature. Among these parameters, fuel injection pressure significantly affects the spray structure. In this study, experiments were conducted using diesel, jatropha oil methyl ester, karanja oil methyl ester, and two biodiesel blended fuels (JB20 and KB20)] as fuels in a diesel engine with different injection pressures. Optical techniques for spray visualization and image processing are very efficient tools for analyzing the spray parameters of the tested fuels. Macroscopic spray properties, such as spray tip penetration, spray cone angle, and spray area, were acquired from images captured by a high-speed video camera. The Sauter mean diameter and spray volume of all of the tested fuels were also estimated. Experimental results showed that the biodiesel blends demonstrate features different from those of diesel fuel. KB100 presented the highest spray tip penetration and spray area, followed by JB100 JB20, KB20 and diesel. Diesel fuel showed the best spray parameters, followed by JB20, KB20, KB100 and JB100. The tested fuels exhibited better spray characteristics at higher injection pressures than at lower ones.