活性粒子对航空煤油着火特性影响机理分析

Analysis of Mechanism of Active Particles on Ignition Characteristics of Aviation Kerosene

关键词:  活性粒子  骨架机理  着火延迟时间  敏感度  航空煤油

Key words:  Active particles  Skeleton mechanism  Ignition delay time  Sensitivity  Aviation kerosene

摘要:

为了研究等离子体中的活性粒子（OH自由基）对航空煤油着火特性的影响，选择正癸烷骨架机理作为航空煤油替代燃料。用零维均质完全混合模型和零维完全预混模型对等离子体点火和燃烧过程进行计算分析，计算敏感度和各组分摩尔分数来揭示活性粒子的添加对正癸烷着火特性的影响，并采用敏感性分析方法对反应机理进行了适当修正。结果表明：修正后机理的着火延迟时间曲线与正癸烷自点火曲线趋势一致。OH自由基的添加显著缩短航空煤油的着火延迟时间：在750K时，加入0.1%OH自由基相比正癸烷自点火着火延迟时间缩短约41%；加入0.5%OH自由基缩短约52.3%。加入0.8%OH自由基缩短约58.2%。加入OH自由基之后大部分基元反应的敏感度向着促进反应进行的方向增加。

Abstract:

In order to study the effects of active particles （OH radicals） in the plasma on the ignition characteristics of aviation kerosene， the framework mechanism of n-decane was selected as an surrogate fuel for aviation kerosene. Zero-dimensional homogeneous complete mixing model and zero-dimensional complete premixing model are used to calculate and analyze the plasma ignition process. The sensitivity and mole fraction of each component are calculated to reveal the effects of active particles on the ignition characteristics of n-decane. The sensitivity analysis method was adopted to appropriately modify the reaction mechanism. The results show that the revised ignition delay time curve of the mechanism is consistent with the trend of the n-decane auto-ignition curve. The addition of OH radicals significantly shortens the ignition delay time of aviation kerosene： At 750K， adding 0.1% OH radicals reduces the self-ignition delay time of n-decane by about 41%； adding 0.5% OH radicals reduces about 52.3%. Adding 0.8% OH radicals reduces about 58.2%. After adding OH radicals， the sensitivity of most elementary reactions increases in the direction of promoting the reaction.