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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1100-1500K,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.
In the heating shock tube using the reflected shock ignition, the use of wall pressure and CH * emitted light as the ignition indication signal, measured kerosene gas / air mixture ignition delay, the ignition temperature of 1100-1500K, the pressure of 2.0 × 105 And 4.0 × 10 5 Pa respectively, and the stoichiometric ratios (Φ) were 0.2, 1.0 and 2.0.The influence of ignition temperature, pressure and stoichiometry on the ignition delay was analyzed.The results showed that the activation energy was almost But the difference of activation energy with the stoichiometric ratio is 0.2, the relationship between the ignition delay and the temperature under different stoichiometric conditions is fitted.The ignition delay is compared with the existing kinetic mechanism , The experimental results are in good agreement with the kinetic mechanism of Honnet et al.Analysis of sensitivity under different stoichiometric conditions showed that at the stoichiometric ratio of 0.2, the key reaction sensitive to ignition delay and There is a big difference when the stoichiometry is 1.0.