For the description of the physical properties of complex fuel, fuel surrogates and their thermophysical properties are crucial to be proposed and determined. The thermophysical properties of fuel are in connection with the design and optimization of injection system in engine, and furtherly influence the performance as well as the emissions of the engine. In this study, we investigated the liquid kinematic viscosity and surface tension of the proposed binary fuel surrogates containing iso-octane with methyl hexanoate between (303.15 and 408.15) K, n-decane with methyl decanoate and methyl octanoate between (313.15 and 423.15) K at the three-mole fraction (0.2500, 0.5000, and 0.7500) close to saturation conditions, respectively, by surface light scattering method. A U-tube densimeter was utilized to determine their liquid density from (293.15 to 433.15) K. Additionally, the GROMOS force field which has been validated for similar systems in our previous study was also applied to simulate the thermophysical properties of the proposed mixtures over the same temperature range. The results show good agreement between the experimental data and the simulation, which provides more demonstration of the acceptance of the GROMOS force field for simulating the alkanes and fatty acid methyl and ethyl esters.

对于复杂燃料物理特性的描述，燃料替代物及其热物理特性的提出和确定至关重要。燃料的热物性关系到发动机喷射系统的设计和优化，进而影响发动机的性能和排放。在这项研究中，我们研究了拟议的二元燃料替代品的液体运动粘度和表面张力，其中异辛烷和己酸甲酯介于 (303.15 和 408.15) K 之间，正癸烷和癸酸甲酯和辛酸甲酯介于 (313.15 和 423.15) K 之间分别在接近饱和条件的三摩尔分数 (0.2500、0.5000 和 0.7500) 下，通过表面光散射方法。使用 U 形管密度计从 (293. 15 到 433.15) K。此外，在我们之前的研究中已经为类似系统验证过的 GROMOS 力场也被应用于模拟所提出的混合物在相同温度范围内的热物理特性。结果表明，实验数据与模拟之间具有良好的一致性，这进一步证明了 GROMOS 力场用于模拟烷烃和脂肪酸甲酯和乙酯的可接受性。