替代燃油的開發近幾年逐漸被重視，而燃料之燃燒特性以及其化學動力學模型成為開發替代燃油中很重要的性質。本研究中，使用快速壓縮機(Rapid compression machine, RCM)以研究傳統航空燃油JP-5以及過去本實驗室所配置之JP-5替代燃油，在氣相且均勻預混的情況下之中低溫點火特性。實驗中探討中低溫壓縮溫度675 – 800K、壓縮壓力10、15和20bar以及當量比0.25和0.37之點火延遲時間的表現。其中，JP-5以及替代燃油之自動點火延遲時間皆隨著壓力以及當量比之上升使得點火延遲時間縮短，並且都在732 - 746K附近開始發生負溫度係數(Negative Temperature Coefficient, NTC)之現象。值得注意的是，兩種燃料伴隨壓力或是當量比的上升將改變其低溫氧化反應途徑，進而將NTC起始溫度隨之提高。兩種燃料在測量的溫度範圍中表現出了相似之點火特性，兩者在當量比0.37時之差異約為6.18%，代表替代燃料良好的重現了真實燃料之點火延遲特性。

The development of alternative fuels has gradually been concerned in recent years, and the combustion characteristics of the fuel and its chemical kinetic model have become very important properties in the development of alternative fuels. In this study, Rapid compression machine (RCM) was used to study the traditional aviation fuel JP-5 and the JP-5 alternative surrogate used in our laboratory. In the experiment, the performance of ignition delay characteristics with low-to-intermediate temperature compression temperature of 675-800K, compression pressure of 10, 15 and 20bar, and equivalence ratio of 0.25 and 0.37 is discussed. Among them, the auto-ignition delay time of JP-5 and asurrogate all shorten the ignition delay time as the compression pressure and equivalence ratio increase, and the negative temperature coefficient (NTC) phenomenon begins to occur around 732-746K. It is worth noting that the increase in pressure or equivalence ratio of the two fuels will change their low-temperature oxidation reaction pathway, thereby increasing the initial temperature of NTC. The two fuels show similar ignition characteristics in the measured temperature range. The difference between the two fuels is about 6.18% when the equivalent ratio is 0.37, which means that the surrogate reproduces the ignition delay characteristics of the real fuel.

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