应能动学院叶轮机械教研室李军教授邀请，美国弗吉尼亚理工暨州立大学 （Virginia Tech）机械工程系 Danesh Tafti 教授将于7月5日访问交大，并做报告。欢迎各位师生参加，报告安排如下:
报告题目：Modeling Sand and Ash Deposition in Gas Turbine Engines
报 告 人：Danesh Tafti (William S. Cross Professor, Virginia Tech)
时间：2018年7月5日上午9:00
地点：能动学院北二楼1402
Modeling Sand and Ash Deposition in Gas Turbine Engines
Danesh Tafti
William S. Cross Professor
Dept. Mechanical Engineering
Virginia Tech
Blacksburg, VA 24061
Aero gas turbine engines often have to operate under particle laden environments during take-off and landing in deserts, flying through dust storms and through high altitude ash clouds precipitated by volcanic eruptions. In spite of best efforts to filter out the particulate matter, inevitably finer particles of diameters less than 50-100 microns get ingested into the engine hot path and cooling circuits. In the hot path these particles are softened or become molten and deposit on critical surface such as endwalls, nozzle vanes and blades, blocking cooling holes and reducing the durability of the engine. Particles ingested in the cooling circuit can also deposit in internal cooling passages and block cooling and impingement holes. In addition, deposited particles can also change the aerodynamics by roughening the surfaces or in severe cases changing the surface topology. To predict deposition, the transport of particles through turbulent flow has to be modeled together with the particle impact dynamics with surfaces. The lecture will describe efforts in developing effective prediction tools based on large-eddy simulations, modeling impact dynamics of particles with surfaces, and recent efforts in developing a framework for coupling the flow and thermal fields to particle deposits.
Danesh Tafti is the William S. Cross Professor in the Department of Mechanical Engineering at Virginia Tech. He obtained his Ph.D. from the Mechanical Engineering Department at Penn State University in 1989. After two years of post-doctoral work he joined the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign, where he held positions of Research Scientist, Senior Research Scientist, and Associate Director. He joined the Mechanical Engineering Department at Virginia Tech in 2002 where he directs the High Performance Computational Fluid-Thermal Science and Engineering Lab. In 2009, he was named the William S. Cross Professor of Engineering. He has served as the Chair of the departmental promotion and tenure committee from 2008-2012 and as the Interim Department Head from 2014 to 2015. His research interests are in high-end, multiscale, multiphysics simulations of single and multiphase systems in the broad areas of propulsion, energy and biological systems. He has over 220 peer reviewed publications to his credit and has given several invited, keynote, and plenary lectures at national and international conferences. He is a Fellow of ASME, Associate Editor of ASME J. Heat Transfer and editorial board member of the Int. J. Heat and Fluid Flow.
