Problems of numerical simulation of high-temperature gas flow fields for hypersonic vehicles

With the development of research on optical radiative characteristics and electromagnetic scattering of hypersonic vehicle,more and more attention has been paid to the properties of high-temperature gas flow fields.A large amount of aerodynamic phenomena are involved in the study of the properties of high-temperature gas flow fields such as aeroheating,ablation,radiation,combustion,chemical reaction,turbulence,etc.,which makes the numerical simulation approach face all kinds of challenges.Based on the computational fluid dynamic(CFD)and direct simulation Monte-Carlo(DSMC)methods,the problems associated with chemical and physical model,method stability and computational efficiency are considered when solving external flow,wake and engine exhaust plume for general hypersonic vehicles at different trajectories,thermal protection and flow regime conditions.The corresponding future research areas are proposed involving numerical technique and chemical and physical model,which will effectively improve numerical effects and increase predicting precision.As a result,the available basic data needed for investigating the influence of flow properties on optical radiative characteristics and electromagnetic scattering of hypersonic vehicle can be supplied.