CAJ | 학술논문

在加热激波管中利用反射激波点火,采用壁端压力和CH*发射光作为点火指示信号,测量了气相煤油/空气混合物的点火延时,点火温度为1100-1500 K,压力为2.0×105和4.0×105Pa,化学计量比(φ)为0.2、1.0和2.0.分析了点火温度、压力和化学计量比对点火延时的影响.结果显示,化学计量比为1.0和2.0时活化能几乎是相同的,但与化学计量比为0.2时的活化能差异很大,拟合得到了不同化学计量比条件下点火延时随温度变化的关系式.点火延时与已有的动力学机理进行对比,实验结果与Honnet等人的动力学机理吻合得很好.对不同化学计量比条件下的反应进行了敏感度分析,结果表明在化学计量比为0.2时,对点火延时敏感的关键反应与化学计量比为1.0时的有很大差异.
재가열격파관중이용반사격파점화,채용벽단압력화CH*발사광작위점화지시신호,측량료기상매유/공기혼합물적점화연시,점화온도위1100-1500 K,압력위2.0×105화4.0×105Pa,화학계량비(φ)위0.2、1.0화2.0.분석료점화온도、압력화화학계량비대점화연시적영향.결과현시,화학계량비위1.0화2.0시활화능궤호시상동적,단여화학계량비위0.2시적활화능차이흔대,의합득도료불동화학계량비조건하점화연시수온도변화적관계식.점화연시여이유적동역학궤리진행대비,실험결과여Honnet등인적동역학궤리문합득흔호.대불동화학계량비조건하적반응진행료민감도분석,결과표명재화학계량비위0.2시,대점화연시민감적관건반응여화학계량비위1.0시적유흔대차이.
The ignition delay times of gas-phase kerosene/air mixtures were measured behind reflected shock waves,using side-wall pressure and CH emission measurements in a heated shock tube.The experiments were performed over the temperature range of 1100-1500 K,at pressures of 2.0× 105 and 4.0× 105 Pa,and for equivalence ratios (φ) of 0.2,1.0,and 2.0.The effects of temperature,pressure,and equivalence ratio on the ignition delay time were investigated.The global activation energy for kerosene/air varies significantly when the equivalence ratio changes from 0.2 to 1.0,whereas the global activation energy at an equivalence ratio of 1.0 is almost the same as that at 2.0.Three correlations for the ignition delay time under three different equivalence ratios were deduced.The current data were compared with available kinetic mechanisms,and were found to be in good agreement with the predictions of Honnet et al.Chemical mechanism sensitivity analyses for different equivalence ratios were performed; the results showed that the ignition sensitivity at an equivalence ratio of 0.2 is quite different from those at 1.0 and 2.0.