Abstract:

 The correlation relation is the credible method to predict the entry aerothermodynamics environment to avoid the deficiency for a wind tunnel experiment and numerical method in hypersonic vehicle design. In this paper, the suitability for the classical Stanton number-Reynolds number correlation relation is researched theoretically, which is deducted from the Kemp-Riddell formula at the stagnation point. The results show that the Stanton number-Reynolds number correlation relation is not universal and restricted with the Mach number, and the Stanton number-combination variable of Reynolds number and Mach number is more universal to correlate the wind tunnel and flight condition. Too low static enthalpy condition for a wind tunnel experiment will harm the correlation relation, which requires enhancing the inflow Mach number to compensate. Then several experiments are carried on 4 wind tunnels, several simulation results are also provided from several teams. The results validate the new correlation relation.

Key words:  Flight thermal environment, Correlation extrapolation, Wind tunnel experiment, Numerical simulation, Stagnation point