Biodiesel has been considering as promising fuel in the situation of ever-depleting fossil fuels and serious environment pollution. Beside clearly known advantages, high viscosity and density, and high surface tension are the acute disadvantages that need to be improved to use directly for an unmodified diesel engine. In this work, 24 samples of biodiesel–diesel fuel blends created by mixing respectively 5%, 10%, 20%, 40%, 50%, 60%, 75% and 100% of fractions of Coconut oil biodiesel (COB), Jatropha oil biodiesel (JOB), Waste oil biodiesel (WOB) in diesel fuel were used for experimental purposes. In the first stage, the effects of biodiesel fractions and temperature on kinematic viscosity and density were developed. In the second stage, the effects of kinematic viscosity and density on fuel supply system, fuel pump network, fuel filters, and spray characteristics (including penetration length (L_b) and Sauter Mean Diameter (SMD)) were investigated. Obtained results of this study based on experimental correlation and mathematical equation showed over 95% of the confident level from a regression correlation equation regarding kinematic viscosity and density.

在化石燃料日益枯竭和环境污染严重的情况下，生物柴油一直被认为是一种很有前途的燃料。除了明显的优点外，高粘度和密度以及高表面张力是需要改进以直接用于未改性柴油发动机的严重缺点。在这项工作中，通过分别混合 5%、10%、20%、40%、50%、60%、75% 和 100% 的椰子油生物柴油 (COB)、麻风树的馏分制成的 24 个生物柴油-柴油燃料混合物样品柴油中的油生物柴油 (JOB)、废油生物柴油 (WOB) 用于实验目的。在第一阶段，研究了生物柴油组分和温度对运动粘度和密度的影响。在第二阶段，运动粘度和密度对燃油供应系统、燃油泵网络、燃油滤清器、L _b ) 和索特平均直径 (SMD)) 进行了研究。本研究基于实验相关性和数学方程获得的结果表明，从关于运动粘度和密度的回归相关方程得出的置信水平超过 95%。