Harald Kleine (University of New South Wales)
“From hypersonic corner flows to transonic airfoils to irregular shock reflection”
|Title:||High-speed flow visualization in hypersonic, transonic and shock tube flows|
|Author:||Harald Kleine 1) and Herbert Olivier 2)|
|Affiliation:||1) School of Engineering and Information Technology, UNSW Canberra, Australia
2) Stosswellenlabor (Shock Wave Laboratory), RWTH Aachen University, Germany
From hypersonic corner flows to transonic airfoils
to irregular shock reflection
|High-speed flow visualisation has played an important role in the investigations conducted at the Stosswellenlabor of the RWTH Aachen University for many decades. In addition to applying the techniques of high-speed imaging, this laboratory has been actively developing new or enhanced visualisation techniques and approaches such as various schlieren methods or time-resolved Mach-Zehnder interferometry. The investigated high-speed flows are inherently highly transient, with flow Mach numbers ranging from about M = 0.7 to M = 10. The availability of modern high-speed cameras has allowed us to expand the investigations into problems where reduced reproducibility had so far limited the amount of information that could be extracted from a limited number of flow visualisation records. Following a brief historical overview, some examples of recent studies will be given, which represent the breadth of applications in which high-speed imaging has been an essential diagnostic tool to uncover the physics of high-speed flows. Applications include the stability of hypersonic corner flows, the establishment of shock wave systems in transonic airfoil flow, and the complexities of the interactions of shock waves with obstacles of various shapes.|
|Biographical Sketch:||Harald Kleine:
Harald Kleine received his degrees in Mechanical/Aeronautical Engineering at the Technical University of Aachen, Germany. During his postgraduate studies he began to design and build advanced optical systems for the visualisation of unsteady high-speed gas flows as observed in shock tubes and super- and hypersonic wind tunnels. He continued to work in this field during a postdoctoral fellowship at McGill University, Montreal, Canada (1995-97). For two years, he worked on the design and testing of blast protection equipment at the Ottawa-based company Med-Eng Systems, and subsequently followed an invitation of Tohoku University, Sendai, Japan, to continue his research on high-speed flows. After the end of his contract with Tohoku University in 2002, Dr.Kleine became a staff member of the University of New South Wales at the Australian Defence Force Academy in Canberra, where he is currently holding the position of Associate Professor. His work focuses on the development of improved time-resolved visualisation techniques and associated applications in shock wave research such as fully unsteady shock wave reflection/focusing/interaction phenomena as well as studies of the physics of blast waves and exterior ballistics. On several occasions, he has also engaged with the artistic aspects of flow visualisation. Many of his images of high-speed flows are featured in exhibitions on scientific photography, book and journal covers.
Herbert Olivier received his degree in Mechanical/Aeronautical Engineering at the Technical University of Aachen, Germany. After this, he worked for Airbus Industries for two years before he returned to Aachen University. In 1996 he became professor and since then he has been the head of the Shock Wave Laboratory of RWTH Aachen University.
Herbert Olivier is working on high-speed flows and shock tube technology. His research activities cover trans-, super- and hypersonic flows, ignition phenomena of fuels, and various topics of interdisciplinary applications of shock waves for industrial use. As editor of the Shock Waves Journal and reviewer of highly esteemed international journals he is involved in the reviewing process of scientific papers related to various fields of fluid and gas dynamics. He is a member of the International Advisory Committee of the Shock Wave Symposium and of other international organizations. Current interests, among others, are related to film cooling and Görtler vortices in super- and hypersonic flows, unsteady transonic airfoil flow, ignition phenomena in hydro-carbon fuels, development of fast thermocouples.