关键词: 点火延迟；煤油裂解气；活性自由基；敏感性分析

Abstract: In order to study the effects of the active radical on the kerosene cracking gas ignition delay time，CHEMKIN software was used to study the ignition delay of cracked kerosene at different temperature in shock tube experiment system. The simulating results were compared with the literature experimental results and the calculation model was verified to be reliable. Ignition delay of cracked kerosene adding different active radical concentration as the initial components was studied. The effects of temperature sensitivity and active radical sensitivity on the equations were analyzed. The results show that 0.5% active radical of O，CH or NO can almost shorten the ignition delay by 10% at 1000K. The ignition delay shorten by active radical becomes less distinct with the increasing of the initial temperature. The temperature and active radical sensitivity of the reactions would decrease by 0.1% at the initial temperature of 2000K compared with that at 1000K. The reactions with large sensitivity of temperature and active radical would change greatly. Multiple reactions repeat as the largest temperature and active radical sensitivity reactions. These reactions are the important basis to simplify the reaction mechanism. The chemical reaction process and path would change with the changing of initial temperature.

Key words: Ignition delay；Cracked kerosene；Active radical；Sensitivity analysis