Research on the Similarity Relationship of Wing-Body Fusion Aircraft Based on the Scaled Model

Through the analysis of the aerodynamic characteristics of model aircraft with a scale of 12.5%, 50% and full-size, respectively, the feasibility of using a scaled model to simulate a full-size aircraft is proved. At the same time, the six-degree-of-freedom nonlinear model of three scaled models was established, and the influence of scale on aircraft trim and natural characteristics was studied based on the Froude number similarity criterion. Additionally, based on the autonomous flight control law designed by the 12.5% scaled model, the autonomous control law parameters of 50% scaled model and full-size aircraft were obtained by using the similarity criterion. Through digital simulation, the nonlinear model of the full-scale wing-body fusion aircraft is simulated and verified, and the influence of the scale on the flight control system can be obtained. According to the above tests, it can provide a certain reference for the scaled flight test of the newly layout aircraft.