Integrated numerical simulation of high enthalpy tunnel and its effects on aerodynamic characteristics

In order to precisely predict test results in high enthalpy shock tunnel considering thermal-chemical non-equilibrium effects, based on the idea of integrated numerical simulation of nozzle/test section/test model flow filed, the simulation of JF-10 high enthalpy shock tunnel is conducted by solving three dimensional Navier-Stokes equations of non-equilibrium flow. The inhomogeneity of free stream in the test section has been analyzed, and the comparison of different simulation methods under various test conditions (i.e. distance from model to nozzle exit and attack angle) is presented. The results show that: 1) the inhomogeneity of free stream in test section is obvious, and the characteristics of the test model flow filed can be influenced by it. 2) compared to integrated numerical simulation, the traditional method shows discrepancies in the prediction of surface heat flux and aerodynamic coefficients for simulating nozzle and test model flow fields separately. 3) the discrepancies are affected by the distance from model to nozzle exit and the attack angle of model, moreover, the discrepancies are increasingly significant when the distance and attack angle increase. 4) the proposed integrated simulation method can truly reflect the test process in the tunnel and improve simulation accuracy, thus cooperate with tunnel test in cross comparison.