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为了建立能适用航空发动机燃烧过程反应动力学计算的国产RP-3航空煤油的化学反应机理,在化学激波管中对国产RP-3航空煤油的着火特性进行了实验测量,获得了多工况下该航空煤油的着火延迟时间。根据RP-3航空煤油的化学组成及物理特性,提出了由正癸烷、甲苯与丙基环己烷(体积百分比为0.65/0.1/0.25三种组份组成的模拟替代燃料,并形成了该替代燃料的化学反应详细机理。采用敏感性分析方法,对该详细反应机理进行了简化,形成了该替代燃料的简化反应机理。采用该简化机理对该替代燃料多工况下的着火特性进行了数值模拟,并与实验数据以及详细机理的计算结果进行了对比分析。结果表明,在不同压力与当量比下,RP-3航空煤油着火延迟时间的对数与着火温度的倒数呈直线关系,并且随着火温度、着火压力的升高以及当量比的降低,RP-3航空煤油着火延迟时间逐渐缩短;同时,在各工况下采用该简化机理计算得到的该替代燃料的着火延迟与详细反应机理的计算结果以及RP-3航空煤油着火延迟的实验值吻合良好。
In order to establish a chemical reaction mechanism that can be applied to the domestic RP-3 aviation kerosene calculated by reaction kinetics of aeroengine combustion process, the ignition characteristics of domestic RP-3 aviation kerosene were experimentally measured in a chemical shock tube, The aviation kerosene’s fire delay time. According to the chemical composition and physical properties of RP-3 aviation kerosene, a simulated alternative fuel consisting of n-decane, toluene and propylcyclohexane (0.65 / 0.1 / 0.25 volume fraction) was proposed and formed The detailed mechanism of the chemical reaction of alternative fuels was described.The sensitive reaction mechanism was simplified to simplify the reaction mechanism of the alternative fuels.The ignition mechanism of the alternative fuels under multiple working conditions was simplified by the simplified mechanism The results show that the logarithm of ignition delay time of RP-3 aviation kerosene is linear with the reciprocal of ignition temperature at different pressure-equivalent ratios, and The ignition delay time of RP-3 aviation kerosene gradually shortened with the increase of the fire temperature, the ignition pressure and the equivalence ratio. At the same time, the ignition delay and detailed reaction mechanism of the alternative fuel calculated by the simplified mechanism under each operating condition The calculated results and RP-3 aviation kerosene ignition delay experimental values ?? in good agreement.