Aerodynamic characteristics of hypersonic morphing biplane

To study the aerodynamic performance of the morphing biplane under different angles of attack and different Mach numbers, as well as the difficulty in selecting the deflection angle of rudder with given angle of attack and Mach number, this paper combines dichotomy, genetic algorithm and Gauss-Newton algorithm to determine the deflection angle of rudder of the morphing biplane under different angles of attack and different Mach numbers. The aerodynamic characteristics of the morphing biplane and the influence of the deflection angle of rudder on the aerodynamic characteristics are analyzed. It is shown that as the Mach number is 5, and the angle of attack ranges from 1° to 8°, the lift-drag ratio of the morphing biplane is obviously greater (up to 4.2 times) than that of Busemann biplane. When the angle of attack is 3°, and the Mach number ranges from 0.5 to 5, the lift-drag ratio of the morphing biplane can be up to 3.4 times than that of Busemann biplane. These results indicate that the morphing biplane can maintain a high lift-drag ratio at large angle of attack and high speed range, and has better applicability and prospects in hypersonic flight.