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Seminar - Recent Progress in Fundamental Study of Supersonic Combustion by Professor Fengquan Zhong
日期:2018 年 06 月 28 日 ( 星期四)
Time:11:00 am – 12:00 pm
Venue:EF305

Abstract:

Supersonic combustion is one of the most important and complex issues for hypersonic air breathing engine applications. In this talk, some recent research results of ignition and flame characteristics of supersonic combustion of ethylene and its mixture with hydrogen, methane and other hydrocarbons are discussed. The unsteady process of ignition and the development of flame are visualized with CH* chemiluminescence images recorded by high-speed camera. Two typical flame structures of triangle-shape and ellipse-shape are found. Dominant frequencies from approximately 50 Hz to 300 Hz are identified via fast-response pressure measurements. At the same time, large eddy simulation with reduced kinetic mechanism is developed for high accurate simulation of supersonic ignition and flame evolution. The computational results reveal significant differences of flame developments between the combustor central region and the near side wall region. Details of turbulent vortical structures as well as shock waves are presented.

Bio-sketch:

Prof. Zhong is a professor in State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences. He received B.S and M.S. degree in Fluid Mechanics from University of Science and Technology of China in 1998 and 2001 respectively and PhD degree in Mechanical and Aerospace Engineering from Princeton University in 2007. His research interests include supersonic combustion, supercritical flow and heat transfer, impingement jet cooling and effusion cooling. Prof. Zhong received Lu Jiaxi Young Talent Award from Chinese Academy of Sciences in 2009 and was selected as Excellent Member of Youth Innovation Promotion Association, Chinese Academy of Sciences in 2015.