Kerosene and diesel fuels involved in spray combustion operations are complex fuels composed of a wide and diverse variety of hydrocarbon components. For practical numerical modeling of the evaporation and combustion phenomena in a combustor, well-designed surrogates fuels that can mimic the real fuel thermal and chemical properties can be utilized. In this study, predictions and validations of the influence of fuel on the liquid and vapor penetration characteristics within a constant-volume chamber were first performed utilizing a benchmark m-xylene/n-dodecane, Jet-A, and diesel surrogate fuels. Then, simulations of reacting spray of a bi-component m-xylene/n-dodecane fule, and a four-component Jet-A surrogate fuel (n-dodecane (C₁₂H₂₆), iso-cetane (C₁₆H₃₄), trans-decalin (C₁₀H₁₈) and toluene (C₇H₈)) were studied aided by skeleton chemical kinetic mechanisms available from the literature. The results of ignition delay time, lift-off length, radicals, and the mass fraction histories of fuel species were comprehensively used to assess the performance of relevant thermophysical and chemical sub-models. Two different chemical mechanisms were compared in detail to investigate the effect of the chemical kinetics model on the flame structures and spray characteristics. It has been found that the spray ignition of multi-component fuels is remarkably influenced by the chosen chemical kinetic mechanism and less affected by the droplet evaporation models.

喷雾燃烧操作中涉及的煤油和柴油燃料是由多种多样的碳氢化合物组成的复杂燃料。为了对燃烧器中的蒸发和燃烧现象进行实用的数值模拟，可以使用设计良好的替代燃料，该替代燃料可以模拟真实的燃料热和化学性质。在该研究中，首先执行预测和燃料的上一个恒定容积腔室中的液体和蒸气渗透特性的影响的验证利用基准米二甲苯/ Ñ -dodecane，喷气-A，和柴油的替代燃料。然后，双组分的喷雾反应的模拟米二甲苯/ Ñ -dodecane富乐，和一个四组分的Jet-A替代燃料（Ñ-十二烷（C ₁₂ H ₂₆），异十六烷（C ₁₆ H ₃₄），反式十氢化萘（C ₁₀ H ₁₈）和甲苯（C ₇ H ₈））由文献提供的骨架化学动力学机制进行了研究。燃烧延迟时间，升空长度，自由基，燃料种类的质量分数历史记录的结果被综合用于评估相关热物理和化学子模型的性能。详细比较了两种不同的化学机理，以研究化学动力学模型对火焰结构和喷雾特性的影响。已经发现，多组分燃料的喷雾着火显着地受到所选择的化学动力学机制的影响，而较少受液滴蒸发模型的影响。