Ground test and numerical simulation on high temperature non-equilibrium flow

Because of the insufficiency of numerical simulation and test verification of high temperature non-equilibrium flow status，the high temperature flow field ground test simulation technology and display technology in high enthalpy shock wave wind tunnel were developed respectively. The ground tests of high temperature non-equilibrium flows were carried out in FD-21 high enthalpy shock wave wind tunnel and FD-20 normal shock wave wind tunnel， then the spatial flow field structure and the aerodynamic heating results of the test hemisphere were obtained. Meanwhile，the numerical simulation technology of high altitude and hypersonic thermochemical non-equilibrium flow was established for the supersonic flight environment，and the reliability of the calculation method was verified by the ground test. The test models were of a hemisphere structure with radius of 20 mm and 60 mm. The calculation results showed that: (1) The inlet flow parameters in the wind tunnel were verified by numerical simulation and the pressure and species can be taken as input parameters for the below numerical simulation. (2) Numerical simulations were carried out on the above typical hemispheres， and the test and calculation results of the hemisphere heat flux were compared and analyzed. The results showed that the two-temperature model (thermal chemical non-equilibrium model-2T) was in good agreement with the test. Under the condition of non-catalytic wall， the relative error between the calculated heat flux result of 2T model and the test result was 11.6% when the total temperature was 2 700 K. The relative error was 17.5% when the total temperature was 4 050 K. (3) The test schlieren (hemisphere shock wave off distance) obtained from the calculated results was in good agreement with each other. Under the condition of non-catalytic wall， the relative error between the shock wave off distance and schlieren of 2T model was −1.9%～0.86%. © 2023 BUAA Press. All rights reserved.