A new conception hypersonic aircraft is presented in this paper, and it has perfect low & high speed aerodynamic performance through variable swept back wing & multifunctional tail fins for maneuver. In this paper, the multifunctional tail fins with different dihedral angles are simulated to get the aerodynamic performance influence. The numerical simulation methods with Euler & Cartesian grid are used to get the aerodynamic performances such as the coefficients of lift, pitching, yawing and rolling moment, the coefficient of drag and aerodynamic heat flux are computing based on rapid engineering estimate. Typical results of the tail fins with different dihedral angles are discussing in detail. The results show that the aircraft has better hypersonic aerodynamic performance, and the multifunctional tail fins improve the lateral static stability of aircraft obviously with little influence for longitudinal aerodynamic force & moment, especially for lift-drag ratio, pitching moment at zero lift and pressure on surface of after body.
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