The Shock-Flame Complex:

 A Combustion Transition State

 报告人:  Elaine S. Oran

Glenn L. Martin Institute Professor, Department of Aerospace Engineering, University of Maryland, College Park

 

    时间：2016年4月29日(周五) 9:30

    地点：中国科学院力学研究所1号楼312会议室

    报告摘要：

Combustion theory begins with steady state or statistically steady concepts of flames and detonations. Such diagrams are useful for estimates as well as being good places to start trying to understand the more difficult concepts of transitions among these steady states. In this presentation, we explore some of the ways these transitions can occur and, in particular focus on a class of intermediate transient states we have called a “shock-flame complexes.” These states consists of a leading shock followed at some distance by a turbulent flame or some type of transitional ignition state. The complex differs from a detonation structure because it is characterized by a considerably larger separation between the leading shock and an extremely turbulent, shock-laden unreacted region between the shock and turbulent flame. In some sense, a detonation could be considered a limiting case or possible end state of the complex we describe. Here we we use time-dependent, multidimensional, and multiphase reactive numerical simulations that show these shock-flame complexes arising in gas-phase gas-dust systems. Applications of this work include safety issues due to the presence of dust and handling and storage of fuels.

    报告人简介：

Elaine S. Oran is Glenn L. Martin Institute Professor at the University of Maryland and Professor of Aerospace Engineering. He also hold position at the University of Maryland in Mechanical Engineering ad Fire Protection Engineering, and is emerita Senior Scientist for Reactive Flow Physics at the Naval Research Laboratory (NRL). She received an A.B. in chemistry and physics from Bryn Mawr College and both a M.Ph. in Physics and a Ph.D. in Engineering and Applied Science from Yale University. Her recent research topics include: chemically reactive flows, turbulence, numerical analysis, high-performance computing and parallel architectures, shocks and shock interactions, rarefied gases, and microfluidics, with applications to combustion, propulsion, astrophysical explosions, and micro-sensor design. In addition to her positions at the University of Maryland and NRL, she is currently an adjunct professor of Aerospace Engineering at the University of Michigan and a visiting professor at Leeds University. She is a member of the National Academy of Engineering, an Honorary Fellow of the American Institute of Aeronautics and Astronautics, and a Fellow of the American Physical Society, the Society of Industrial and Applied Mathematics, and the American Society of Mechanical Engineers. She has received honorary doctorates from Ecole Central de Lyon and Leeds University, as well as a number of prizes and medals for technical work, including the Zeldovich Gold Medal of the Combustion Institute and the Fluid Dynamics Prize of the American Physical Society.