学科建设
物电论坛694期
发布于:2017-02-21 10:05:12   |   作者:[学院] 物电学院   |   浏览次数:1944

Title:              Plasmas for Supersonic and Hypersonic Flow Control

 

Keywords: Plasmas in High-Speed Flow; Flow Control; Combustion Control; EM Waves Propagation

 

Abstract:

The lecture will address key results of recent experimental studies demonstrating successful use of nonequilibrium plasmas for efficient control of flow structures, flow parameters, and rates of chemical reactions in high-speed reacting flows. This field is commonly referred to as Plasma Aerodynamics.

 

The principal focus of this work is on the effect of high-speed flows on specific properties of electrical discharges, as well as on the phenomena controlling the reverse effect of the plasma on the flow. The general approach to this class of problems is based on identification and use of several key physical mechanisms of interaction of electric discharges with the flow: Joule heating, body forces (including electrostatic and magnetohydrodynamic interactions), and plasmachemical activation of reacting gas mixtures. Controlling the plasma properties, such as strongly inhomogeneous spatial structures, non- equilibrium chemical composition, and unsteady behavior allow considerable reduction of required plasma energy budget while still producing a significant effect on the flow.

 

The results of several laboratory experiments are discussed, with specific emphasis on three major issues: (1) specific properties of weakly-ionized plasma relevant to flow control; (2) plasma-based flameholding/mixing in supersonic and hypersonic flows; and (3) problem of EM waves interaction with highly transient electric discharges. Unresolved critical issues in the field of plasma-flow interaction, as well as potentially promising approaches, are also discussed.

 

Biography: Prof. 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, USA, and currently he is a Full Research

Professor at the University of Notre Dame, USA. His research interests and contributions are in weakly ionized plasmas, plasma aerodynamics, aerothermodynamics, and active flow control. Prof. Leonov is an Associate Fellow of AIAA, AIAA Technical Committee Member, EUCASS Technical Committee Member, PADG (AIAA) Coordinator, FLUCOME Chair (2017) and Honorary Member, etc.

报告时间:201733日上午10

报告地点:沙河校区科研楼204

主持人:赵青教授