Effect of the post - Pulse discharge channel's fast turbulent expansion on the gas flow

This paper presents results of experimental and theoretical efforts on the filamentary transversal pulse discharge application for mixing intensification in high-speed airflow. At present, the plasma of electrical discharges in airflow is considered as a quite promising method for flow/flight control and combustion enhancement in high speed flows. But for successful application, several technical issues need to be addressed: fuel ignition by direct heating/active radicals deposition/flow structure modification, mixing in non-premixed flow, flame-holding, etc. Preliminary analysis has shown that the short-pulse repetitive transversal electric discharge is one of the most prospective solutions for the duct with circular crosssection. But at the same time, the properties of the filamentary plasma are not well studied under such specific conditions. The effect of fast turbulent expansion of the post-discharge channel in high-speed flow was observed experimentally. The mechanism of the phenomena was described theoretically for quiescent ambient conditions. The theoretical predictions are in a good agreement with experimental results. In this paper it is assumed that effect of fast turbulent expansion of the post-discharge channel is effective for an acceleration of mixing in the non-premixed multi-component flow.