Shock Wave Transmission by Detonation Wave Interaction with Contact Discontinuity
报告人: Frank K. Lu
Aerodynamics Research Center
University of Texas at Arlington
时间：2017年3月3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：
The one-dimensional interaction of a detonation wave with a contact discontinuity is investigated analytically and experimentally for oxyhydrogen detonations. The analytical and experimental results show that the transmitted shock through the contact surface and into a non-combustible gas can either be amplified or attenuated depending on the reflection type at the contact surface and on the ratio of acoustic impedance across the contact surface. Experimental measurements are made with a detonation-driven shock tube facility to determine the transmitted shock velocity into a non-combustible He/air mixture. The oxyhydrogen equivalence ratio in the detonation section is varied from 0.5−1.5 and the driven section He mole fraction is varied from 0−1.0 to test a broad range of acoustic impedance ratios ranging from approximately 0.5−1.8. The analytical results are shown to have acceptable agreement with the measured transmitted shock wave velocity in the case of a reflected rarefaction from the contact surface. Additionally, the results indicate the detonation wave reaction zone properties could have an important role that influences the transmitted shock properties in the case of a reflected shock from the contact surface.
报告人简介：
Professor Frank Lu joined the University of Texas at Arlington in August 1987 where currently serves as the Director of UTA’s Aerodynamics Research Center which houses aerodynamic test facilities from low speed through hypersonic, as well as an arc heater and a number of detonation engine demonstrators. . His degrees are from Cambridge, Princeton and Penn State. His present research interests are in detonations and gasdynamics. Professor Lu has authored or co-authored over 200 papers and holds 7 patents and patent applications. He edited a special section on pressure gain combustion that was published in the January–February 2017 issue of the Journal of Propulsion & Power. He is active in technical activities and is presently AIAA Vice President – Publications. He is a Fellow of ASME and the Royal Aeronautical Society, a member of the International Shock Wave Institute and the IEEE. He was elected into the 2017 Class of Fellows of AIAA. He is on the editorial board of Aerospace Science & Technology and Shock Waves, and co-editor of the book series Shock & High Pressure Phenomena. Professor Lu also consults in his areas of expertise and serves as the Chief Technology Officer of Afthon, a company he co-founded in 2014 to commercialize detonation-based technologies.
