能源动力工程青年学术沙龙系列报告之三：美国燃烧领域学者Associate Professor Tianfeng Lu学术讲座

讲座题目：Toward Accurate Combustion Simulations with Stiff Chemistry

主讲人：Associate Professor Tianfeng Lu，Department of Mechanical Engineering, University of Connecticut

报告时间：2014年6月27日（星期五）上午9:00

报告地点：重庆大学A区动力大楼304会议室

主办单位：低品位能源利用技术及系统教育部重点实验室

欢迎老师、同学参加!

主讲人介绍：

Dr. Lu received his B.S. and M.S. in Engineering Mechanics from Tsinghua University in 1994 and 1997, respectively, and Ph.D in Mechanical and Aerospace Engineering from Princeton University in 2004. Since then he has been a postdoctoral fellow and a research staff at Princeton. He joined the Department of Mechanical Engineering in the University of Connecticut as faculty member in 2008. Lu’s primary research interest is in combustion and computational fluid dynamics with special interests in mechanism reduction, stiff chemistry solver, and computational flame diagnostics. He is a member of the Combustion Institute, Associate Fellow of the American Institute of Aeronautics and Astronautics (AIAA), and the recipient of the inaugural Irvin Glassman young investigator award from the Eastern States Section of the Combustion Institute.

报告摘要：

Practical combustion systems involve complex and stiff chemistry that is difficult to simulate, particularly when strong chemistry-turbulence interactions are present. Accurate resolution of chemistry and its response to flow variation is key to create a predicting power for chemically reacting flows, and it requires efficient and accurate methods for mechanism reduction, stiff chemistry solver, direct flame simulations, computational diagnostics, and combustion modeling, etc. This presentation will show our effort on theoretical and numerical development in response to these challenges. Specifically, reduced mechanisms were obtained for gasoline, diesel, kerosene, and renewable fuels, such as ethanol and biodiesel, using systematic approaches of directed relation graph (DRG), analytically solved linearized quasi steady state approximations, and dynamic chemical stiffness removal. New integration schemes will be introduced for efficiently solving stiff chemistry coupled with transport when conventional solvers are not applicable. For computational diagnostics, a chemical explosive mode analysis (CEMA) will be presented for systematic identification of critical flame features in complex flow fields, such as local ignition/extinction, flame instabilities, and flame fronts. Results from collaborative efforts on direct numerical simulation (DNS) with the nonstiff reduced mechanisms and CEMA will be shown for turbulent jet flames and homogeneous charge compression ignition combustion.

能源动力工程青年学术沙龙系列报告之三：Associate Professor Tianfeng Lu学术讲座