High-enthalpy Hypersonic Flows

Abstract

High-enthalpy hypersonic flows represent a captivating and intricate area of fluid dynamics, marked by extreme conditions that challenge our understanding of aerodynamics and thermodynamics. These flows occur at speeds exceeding approximately 3 km/s, where the kinetic energy of the moving gas is so substantial that it induces significant alterations in the chemical and physical properties of atmospheric gases. As vehicles travel at these velocities, they encounter extremely high temperatures that can cause dissociation and ionization of the gases. This creates a unique environment where traditional aerodynamic theories must be adapted to account for the effects of high temperatures. 

Understanding high-enthalpy hypersonic flows is essential for the advancement of cutting-edge aerospace technologies, including atmospheric entry vehicles. The speaker conducts research in this field, utilizing sophisticated computational models and experimental techniques to unravel the complexities of these flows, with the aim of enhancing the performance and safety of hypersonic systems. In this seminar, the speaker will discuss contributions made throughout his career so far, including insights into high-enthalpy expanding flows, the characterisation of test conditions in high-enthalpy ground-test facilities, and theoretical analyses of high-enthalpy flow over a sphere.

Speaker

Dr Sangdi Gu is a Research Assistant Professor in the Department of Aeronautical and Aviation Engineering at The Hong Kong Polytechnic University. He holds a PhD in Aerospace Engineering from The University of Queensland and has extensive experience in hypersonic research, including postdoctoral work at RWTH Aachen University in Germany and research visits to institutions such as NASA Ames Research Center. His research encompasses thermochemical nonequilibrium phenomena, radiation gasdynamics, impulse facilities, and optical diagnostics. Dr Gu has published numerous articles in leading journals, and teaches advanced postgraduate courses as well as fundamental undergraduate courses in aerodynamics and propulsion, actively contributing to the academic growth of his students. He currently serves as the chief supervisor for two PhD candidates and one MPhil student, while also leading significant research projects funded by various grants.