Abstract
The ignition dynamics of a CH4: O2: N2: Ar = 1: 4: 15: 80 mixture by a high-voltage nanosecond discharge is simulated numerically with allowance for experimental data on the dynamics of the discharge current and discharge electric field. The calculated induction time agrees well with experimental data. It is shown that active particles produced in the discharge at a relatively low deposited energy can reduce the induction time by two orders of magnitude. Comparison of simulation results for mixtures with and without nitrogen shows that addition of nitrogen to the mixture leads to a decrease in the average electron energy in the discharge and gives rise to new mechanisms for accumulation of oxygen atoms due to the excitation of nitrogen electronic states and their subsequent quenching in collisions with oxygen molecules. Acceleration of the discharge-initiated ignition is caused by a faster initiation of chain reactions due to the production of active particles, first of all oxygen atoms, in the discharge.
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Original Russian Text © N.L. Aleksandrov, S.V. Kindysheva, E.N. Kukaev, S.M. Starikovskaya, A.Yu. Starikovskii, 2009, published in Fizika Plazmy, 2009, Vol. 35, No. 10, pp. 941–956.
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Aleksandrov, N.L., Kindysheva, S.V., Kukaev, E.N. et al. Simulation of the ignition of a methane-air mixture by a high-voltage nanosecond discharge. Plasma Phys. Rep. 35, 867–882 (2009). https://doi.org/10.1134/S1063780X09100109
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DOI: https://doi.org/10.1134/S1063780X09100109