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首页> 外文期刊>Combustion and Flame >Kinetics Of Ignition Of Saturated Hydrocarbons By Nonequilibrium Plasma: C_2h_6- To C_5h_(12)-containing Mixtures
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Kinetics Of Ignition Of Saturated Hydrocarbons By Nonequilibrium Plasma: C_2h_6- To C_5h_(12)-containing Mixtures

机译：非平衡等离子体点燃饱和烃的动力学：含C_2h_6-至C_5h_（12）的混合物

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摘要

The kinetics of ignition in C_nH_(2n+2):O_2:Ar mixtures for n = 2 to 5 has been studied experimentally and numerically after a high-voltage nanosecond discharge. The ignition delay time behind a reflected shock wave was measured with and without the discharge. It was shown that the initiation of the discharge with a specific deposited energy of 10-30 mJ/cm~3 leads to an order of magnitude decrease in the ignition delay time. Discharge processes and following chain chemical reactions with energy release were simulated. The generation of atoms, radicals and excited and charged particles was numerically simulated using the measured time-resolved discharge current and electric field in the discharge phase. The calculated densities of the active particles were used as input data to simulate plasma-assisted ignition. The sensitivity of the results to variation in electron cross sections, reaction rates and radical composition was investigated. Good agreement was obtained between the calculated ignition delay times and the experimental data. The analysis of the simulation results showed that the effect of nonequilibrium plasma on the ignition delay is associated with faster development of chain reactions, due to atoms and radicals produced by the electron impact dissociation of molecules in the discharge phase. Finally, we studied the role of various hydrocarbon radicals in the plasma-assisted ignition of the mixtures under consideration.
机译：在高压纳秒放电后，通过实验和数值研究了C = nH_（2n + 2）：O_2：Ar混合物中n = 2到5的点火动力学。测量有无放电后反射冲击波背后的点火延迟时间。结果表明，以10-30 mJ / cm〜3的比沉积能量开始放电会导致点火延迟时间减少一个数量级。模拟了放电过程以及随后的伴随能量释放的链式化学反应。使用测得的时间分辨放电电流和放电阶段的电场，对原子，自由基以及激发和带电粒子的生成进行了数值模拟。活性颗粒的计算密度用作模拟等离子体辅助点火的输入数据。研究了结果对电子截面，反应速率和自由基组成变化的敏感性。在计算的点火延迟时间和实验数据之间获得了良好的一致性。对模拟结果的分析表明，非平衡等离子体对点火延迟的影响与链反应的更快发展有关，这归因于在放电阶段分子的电子撞击解离产生的原子和自由基。最后，我们研究了各种烃自由基在所考虑混合物的等离子体辅助点火中的作用。

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