Study Of Hypersonic Viscous Interaction Including High-temperature Gas Effects

In this paper, two-dimensional compression corner flows, oblique shock incident boundary layer flows, 25/55°angle double cone flows are studied numerically. The complex flow phenomenas such as shock / shock interference, shock / boundary layer interaction, flow separation in these hypersonic flows are analysed. The analysis of high-temperature real gas effects on the impact of these flow phenomena are presented. The effects of the free-stream nonequilibrium on the cpmpression coner flow field in the high-enthalpy tunnel are stuidied numerically.In the two-dimensional compression corner flow studies, 15°,18°, 24°compression corner models were used. The effects of stream enthalpy, Mach number, temperature and wall temperature, catalytic properties on the flow field, especially on the separation zone are studied. Complete gas model, thermodynamic equilibrium chemical freeze model, thermo-chemical non-equilibrium model, the thermo-chemical equilibrium model were used for the total enthalpy 54.6MJ/Kg to simulate the compression corner flow,to understand the thermo-chemical states of the flow field under high enthalpy conditions.In the oblique shock wave incident boundary layer flow studies, the effects of Mach number,the strength of the incident oblique shock wave, catalytic properties of the wall and wall temperature on the flow are analysed, the impacts of boundary layer state at the incident point are also analysed. Flat wall heat flux distribution shows that the peak heat flow rate near the point of the incident oblique shock wave may be higher than the flat section of the heat one to two orders of magnitude. By comparing the translational temperature, vibrational temperature and mass fraction distribution of oxygen atoms in the flow field, to understand the thermo-chemical states of the flow field, found a high-temperature zone, which has important implication to the local thermo-chemical state and the wall heat fluxs.A low-enthalpy nitrogen medium double-cone experiment is investigated.We performed a grid convergence study,and examined the effects of numerical dissipation. Based on the results of numerical simulation ,flow structure were analyzed in detail, to understand the feedback mechanism between shock/boundary layer interaction and separation zone. Concludes with some foreign research results, analysis of the vibrational energy relaxation and chemical reaction on the double cone flows.