氢气添加对RP-3航空煤油着火特性的影响

Effects of Hydrogen Addition on Ignition

关键词:  氢气  RP-3航空煤油  反应机理  着火延迟时间  活性自由基

Key words:  Hydrogen  RP-3 kerosene  Reaction mechanism  Ignition delay time  Active radical

摘要:

为了揭示可燃小分子气体H2添加对RP-3航空煤油着火特性的影响，采用激波管实验装置对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RP-3航空煤油的着火延迟时间。以RP-3航空煤油的正癸烷、甲苯和丙基环己烷三组分模拟替代燃料的燃烧反应机理为基础，构建了RP-3/H2混合燃料的Zeng-Jachimowski燃烧反应机理，并对该机理进行了验证。采用该机理对RP-3/H2混合燃料多工况下的着火延迟时间进行计算与分析，结果表明:Zeng-Jachimowski机理可以较好预测高温条件下RP-3/H2混合气着火特性；当H2添加比小于70%时，着火延迟时间随H2添加缓慢减小，当H2添加比大于90%时，RP-3航空煤油/氢气混合气活性显著提升，着火延迟时间随H2添加急剧减小；通过对H，OH和O活性自由基的浓度及H自由基生成速率ROP分析解释了H2添加对RP-3航空煤油着火延迟时间的非线性影响。

Abstract:

In order to reveal the effects of H2 addition on the ignition characteristics of RP-3 kerosene，the ignition characteristics of RP-3 was measured in a chemical shock tube and the ignition delay time of the kerosene at various conditions were obtained. Based on the detailed reaction mechanism of RP-3 kerosene’s surrogate fuel which includes n-decane，toluene and propyl cyclohexane，a Zeng-Jachimowski reaction mechanism for the RP-3/H2 mixed fuel was developed and validated. This reaction mechanism was adopted to calculate and analyze the ignition delay time of RP-3/H2 mixture at various conditions，and the results show that the Zeng-Jachimowski mechanism can well predict the ignition delay time of RP-3/H2 mixture under high temperature condition. For H2 addition less than 70%，the ignition delay time decreases with H2 addition slowly，and for the H2 addition more than 90%，the ignition delay time decreases with H2 addition dramatically. Analysis of H, O，OH active radical concentration and H ROP has interpreted the non-linear influence of H2 addition on the ignition delay time of RP-3 kerosene.