The Pressure-Based Solver is used for the calculation, and according to [21], for the complicated high-speed rotating and serious streamline curvature, the PRESTO! (PREssure STaggering Option) interpolation is used for the pressure item, and the PISO (Pressure Implicit with Splitting of Operators) algorithm is adopted for the iteration. The related parameters of the calculation model are set respectively according to the analysis on the above four kinds of the two-equation model. The velocity condition is defined at the inlet of air and exhaust, respectively, and the values of turbulence intensity I and turbulence scale l or k and ε given for the k − ε series turbulence models. In this study, the turbulence intensity I and the
turbulence scale l are given by Eq. (2.1).