Numerical analysis of turbulent flame enhancement by nanosecond repetitively pulsed plasma discharges

Experimental studies of plasma-assisted combustion have shown that Nanosecond Repetitively Pulsed (NRP) discharges are a very efficient way to improve flame stability in lean regimes. These generate non-equilibrium plasma induces local heating and an important production active species sufficient enhance the combustion. The aim this article is understand physical chemical mechanisms involved turbulent High-performance computations bluff-body premixed methane-air flame, experimented at EM2C laboratory, conducted for purpose. Simulations performed by combining semi-empirical model with analytical mechanism. Without electrical discharges, only weak reaction zone behind bluff body observed. However, when assisted plasma, power surface increase significantly. A analysis basis shows heat radical O produced NRP induce dissociation main burnt gases H2O CO2 into radicals OH, H, CO, H2, O2. long lifespan H2 O2 convected from center recirculation front where they consumed increasing reactivity. This causes release rate attaches which can develop downstream.