Mechanism of ignition by non-equilibrium plasma

The effects of hydrodynamic stretch on the flame propagation enhancement of ethylene by addition of ozone

“…In addition, the output of the LED was monitored for fluctuations in output intensity using a second amplified photodiode. However, inevitable fluctuations in the O 3 generator and slight changes in pressure due to back-pressuring of the system by the seeder resulted in some fluctuation in O 3 concentrations of approximately ±150 ppm (out of approx. 11 000 ppm) in the synthetic air.…”

“…When looking towards more realistic and practical applications, the effect of stretch is critical because it is nearly always present. Specifically for O 3 , the effect of stretch may be more pronounced because of the possibility of different decomposition and reactive pathways in the early stages of the flame zone. As the enhancement by O 3 can rely on both O 3 decomposition as well as the direct reaction of O 3 with other species that are present in the early region of the flame, the upstream diffusion of species and their composition are critical to enhancement.…”

Emission characteristics of kerosene-air spray combustion with plasma assistance

“…Eventually, some of the electronic states lead to the dissociation of gas components and, thus, the formation of highly reactive radicals like atomic oxygen, atomic hydrogen and hydroxyl, as shown by different authors. [3][4][5][6][7] Productions of new species accelerate chain branching reactions and broaden the ignition kernel, while the elevated temperatures from the plasma reduce radical quenching caused by recombination and diffusion to the walls. 3 A variety of plasma discharge systems such as pulsed coronas, 8 microwave discharges, 9 magnetic gliding arc 10 and pulsed nanosecond volume discharges 5,[11][12][13] have been studied for potential combustion applications.…”

Localized pulsed nanosecond discharges in a counterflow nonpremixed flame environment

“…The possibilities for impacting a flame with a plasma, through the additional chemistry it introduces [11][12][13], are varied; an important choice being where to position the plasma source relative to the flame. From this standpoint, two possibilities have been explored: producing the plasma upstream of the flame, or overlapping plasma and flame.…”