Seminar - Ground-based Study on Hypervelocity Flows by Dr. Zongmin Hu
Date: 26 July 2013 (Friday)
Time: 10:00 am – 11:00 am
Venue: EF305, The Hong Kong Polytechnic University
Hypervelocity is referred to velocity of 5 km/s and above. To study the atmospheric reentry of vehicles or spaceship, we need to simulate the hypervelocity flight environment in the test facilities such as hypersonic wind tunnel on the ground. As the total enthalpy of a high-speed flow is proportional to the square of velocity, extremely high energy is necessary to generate hypervelocity test flows. Due to the restriction in the temperature of driving gas and material strength, neither traditional blowdown wind tunnel nor pulse shock tunnel can duplicate the real flight conditions by far. Therefore, researchers in the hypersonic community have been developing shock-expansion tubes/tunnels for the purpose of hypervelocity simulation during the last two decades.
A detonation driven shock-expansion tube has been set up in the Institute of Mechanics which can generate the test flows at velocities up to 8 km/s. Model tests have also been conducted in the last few years. However, the extremely short test time duration of the facility gives rise to difficulties in experimental measurement and flow diagnostics. On the other hand, very strong shock waves and thermo-chemical non-equilibrium bring forth challenges in numerical simulations for the tests. Dr. Hu is going to give a talk on the progress in the experimental and numerical integrated investigations into the ground-based hypervelocity test.
Dr. Zongmin Hu is an Associate Professor from Institute of Mechanics, Chinese academy of Sciences. He obtained his Ph.D. degree in Fluid Mechanics from the same institute in 2006. Prior to joining the current institute in 2011, he also worked with National University of Singapore during 2009 to 2011 as a Research Scientist, and Gyeongsang National University of South Korea during 2006 to 2009 as a postdoc/academic research professor, respectively. Dr. Hu has authored and co-authored over 50 scientific publications in the field of fluid dynamics. His research interest involves shock dynamics, chemically reactive fluid dynamics, detonation physics, high-power chemical laser, flow supercavitation and CFD techniques.