Abstract:In order to study the aerodynamic performance of the bird-like aircraft, a new bird-like flapping wing aircraft is designed. The Fluent mid-line elastic solid smoothing method was used to analyze the influence of surrounding gas on the aerodynamic performance of the wing. When the wing flapped up and down, it also participated in the pitching motion. There was also a bending motion between the inner wing and the outer wing. The speed and pressure of the surrounding flow field were changed and the coefficient of lift resistance of the wing was also changed with the flow field. The simulation results obtain the laws of the lift-to-drag ratio, lift and drag vary with the flow rate, frequency and angle of attack, as well as the angle of attack, speed and frequency, respectively, within a certain frequency range and within a certain frequency range.