Ignition of hydrocarbon-containing mixtures by nonequilibrium plasma. Experiment and numerical modelling

摘要

Experiments and numerical modelling of ignition of hydrocarbon-containing mixtures under the action of pulsed nanosecond discharge have been performed. Electrical parameters of the gas discharge were controlled together with the ignition delay time for combustible stoichiometricmixtures CnH2n+2:O2 (10 %) diluted by Ar (90 %) for hydrocarbons from CH4 to C5H12. Initial gas temperature varied from 950 to 2000 K, and the pressure was between 0.2 and 2.0 atm. Numerical model has been developed to describe ignition by low temperature nonequilibrium plasma.Measured electric field and energy input histories were used to simulate gas excitation by thedischarge. The obtained densities of atoms and radicals were taken as initial parameters forsimulations of chemical kinetics in a microsecond time scale. As a result, the shift of the ignitiondelay time has been calculated and compared with the experimental data.