Jet fuel is widely used in air transportation, and sometimes for special vehicles in ground transportation. In the latter case, fuel spray auto-ignition behavior is an important index for engine operation reliability. Surrogate fuel is usually used for fundamental combustion study due to the complex composition of practical fuels. As for jet fuels, two-component or three-component surrogate is usually selected to emulate practical fuels. The spray auto-ignition characteristics of RP-3 jet fuel and its three surrogates, the 70% mol n-decane/30% mol 1,2,4-trimethylbenzene blend (Surrogate 1), the 51% mol n-decane/49% mol 1,2,4-trimethylbenzene blend (Surrogate 2), and the 49.8% mol n-dodecane/21.6% mol iso-cetane/28.6% mol toluene blend (Surrogate 3) were studied in a heated constant volume combustion chamber. Surrogate 1 and Surrogate 2 possess the same components, but their blending percentages are different, as the two surrogates were designed to capture the H/C ratio (Surrogate 1) and DCN (Surrogate 2) of RP-3 jet fuel, respectively. Surrogate 3 could emulate more physiochemical properties of RP-3 jet fuel, including molecular weight, H/C ratio and DCN. Experimental results indicate that Surrogate 1 overestimates the auto-ignition propensity of RP-3 jet fuel, whereas Surrogates 2 and 3 show quite similar auto-ignition propensity with RP-3 jet fuel. Therefore, to capture the spray auto-ignition behaviors, DCN is the most important parameter to match when designing the surrogate formulation. However, as the ambient temperature changes, the surrogates matching DCN may still show some differences from the RP-3 jet fuel, e.g., the first-stage heat release influenced by low-temperature chemistry.

喷气燃料广泛用于航空运输，有时还用于地面运输中的特殊车辆。在后一种情况下，燃油喷雾的自动点火行为是发动机运行可靠性的重要指标。由于实际燃料的组成复杂，通常将替代燃料用于基本燃烧研究。对于喷气燃料，通常选择二组分或三组分替代品来模拟实际燃料。RP-3喷气燃料及其三种替代物的喷雾自燃特性：70％摩尔正癸烷/ 30％摩尔1,2,4-三甲基苯共混物（替代物1），51％摩尔正癸烷/ 49摩尔％1,2,4-三甲基苯共混物（替代品2），和49.8％摩尔n-十二烷/21.6%摩尔iso-cetane / 28.6％mol甲苯共混物（Surrogate 3）在加热的恒定体积燃烧室内进行了研究。替代品1和替代品2具有相同的成分，但是它们的混合百分比不同，因为这两种替代品的设计目的是分别捕获RP-3喷气燃料的H / C比（替代品1）和DCN（替代品2）。替代品3可以模拟RP-3喷气燃料的更多理化特性，包括分子量，H / C比和DCN。实验结果表明，替代品1高估了RP-3喷气燃料的自燃倾向，而替代品2和3显示出与RP-3喷气燃料的自燃倾向非常相似。因此，要捕获喷雾的自燃行为，在设计替代配方时，DCN是最重要的参数。但是，随着环境温度的变化，