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A Joint HKSTAM/PolyU ME Distinguished Seminar - Hypersonic Research in the High Enthalpy Shock Tunnel Göttingen by Prof. K. Hannemann
日期:2017 年 07 月 03 日 ( 星期一)
Time:3:00 pm – 4:00 pm
Venue:AG710

Abstract:

The High Enthalpy Shock Tunnel Göttingen, HEG of the German Aerospace Center is a free piston driven shock tunnel, which was developed and constructed from 1989 - 1991. In a free piston driven shock tunnel, the conventional driver of a shock tunnel is replaced by a free piston driver. This concept was proposed by Prof. Ray Stalker and, therefore, the tunnels are also referred to as Stalker tubes. HEG was commissioned for use in 1991, at that time being the largest facility of its type worldwide. Since then it was extensively used in a large number of national and international space and hypersonic flight projects. The research activities which were always strongly linked with CFD investigations range from the calibration process of the facility and the study of basic aerodynamic configurations, which are well suited to investigate fundamental aspects of high enthalpy flows, to the investigation of complex entry, re-entry, hypersonic flight and integrated scramjet configurations. Originally, HEG was designed for the investigation of the influence of high temperature effects such as chemical and thermal relaxation on the aerothermodynamics of entry or re-entry space vehicles. In addition to the operation at high enthalpies (12 - 23 MJ/kg), the HEG operating range was continuously extended. One emphasis was to generate test section conditions which allow investigating the flow past hypersonic configurations at low altitude Mach 6 up to Mach 10 flight conditions at approximately 33 km altitude. These low enthalpy conditions cover the range of total specific enthalpies from 1.5 - 6 MJ/kg. Selected research activities conducted in HEG during its 25 years of operation will be presented including fundamental studies to quantify the influence of high temperature effects on the external aerodynamics of re-entry vehicles, investigations of supersonic combustion ramjet (scramjet) flow paths and research related to the laminar to turbulent hypersonic boundary layer transition process and the possible damping of second mode instabilities by ultrasonically absorptive surface materials.

Bio-sketch:

Prof. K. Hannemann studied mechanical engineering at the University of Karlsruhe, Germany. He received his diploma in 1984. Subsequently he joined the German Aerospace Center in Göttingen and worked on incompressible wake flows. After receiving his doctoral degree in 1987 from the University of Karlsruhe, he began to work on space related research topics. These include experimental and numerical aerothermodynamics and space propulsion. From 1999 – 2002, he was Head of to the High Enthalpy Shock Tunnel Göttingen, HEG group and in 2002 he became Head of the Spacecraft Department at DLR Göttingen. Since 2010 he lectures at the Justus Liebig Universität Gießen and in 2013 he was appointed Professor for Spacecraft at the JLU Gießen. Prof. K. Hannemann is member of a number of international committees serves on the Editorial Board of the Shock Wave Journal and is Field Editor Aerothermodynamics for the CEAS Space Journal.

* This seminar is jointly organized by The Hong Kong Society of Theoretical and Applied Mechanics and Department of Mechanical Engineering, The Hong Kong Polytechnic University