Abstract

The constricted forms of electric discharge (long submicrosecond discharge, Quasi-DC discharge, shallow cavity discharge, etc.) were employed for active control of duct-driven shock-dominated flows, cavity-based flow, for control of shock wave – boundary layer interaction, mixing enhancement, fuel ignition, and flame-holding [1, 2]. The principal focus of this ongoing study is for the effect of high-speed flows on the characteristics of air electric discharges, as well as phenomena controlling the reverse effect of plasma on the flow.

In upcoming talk, a near-surface discharge between flush-mounted electrodes installed in a spanwise array on a plane wall of a supersonic M=2 duct (Quasi-DC discharge) will be mostly addressed. Major features of this discharge are realized due to a strong coupling of the plasma to the moving gas. This discharge is supplied by a DC voltage waveform but demonstrates a highly transient pulse-periodic pattern. The filamentary plasma developed along the velocity vector in compressible flow was found to significantly modify the shock-dominated flow, in some cases leading to suppression of the reflected shock waves. For the Quasi-DC discharge, despite a distinct picture of behavior, some particular details remain vague. A longitudinal distribution of the power release, the governing factors of the discharge length, and even the rapid transport of the discharge from the boundary layer into the core flow need to be ascertained. These and other phenomena related to constricted plasma interaction with supersonic airflow will be discussed in detail.

Bio

Dr. Sergey B. Leonov received his PhD from The Baltic State University in 1990, and a senior Doctor of Science degree from the Russian Academy of Sciences in 2006. He worked in research and higher education institutions in Moscow, Russia, including Joint Institute for High Temperature of the Russian Academy of Sciences where he was a Head of Department, and, concurrently, Moscow Open University where he was a Professor. In 2013-2014, he was a Visiting Professor at The Ohio State University and currently he is a Full Research Professor at the University of Notre Dame. His research interests and contributions are in weakly ionized plasmas, plasma aerodynamics, aerothermodynamics, supersonic combustion and active flow control. He has over 400 publications. Prof. Leonov is an Associate Fellow of AIAA and an IEEE Senior Member, AIAA Plasmadynamics and Lasers Technical Committee Member, Coordinator of Plasma Aerodynamics Discussion Group, FLUCOME Honorary Member, etc.