Hydrodynamic Derivative Calculation and Turning Performance Simulation of Amphibious Aircraft

To improve the rotation efficiency of amphibious aircraft on the water surface, CFD technology is used to simulate maneuverable motion in this paper. The numerical calculations of direct navigation, oblique towing, no drift angle in rotating arm motion, drift angle in rotating arm motion, direct navigation with rudder, and planar motion are carried out, respectively. The hydrodynamic derivatives such as position derivative, rotation derivative, coupling derivative, rudder derivative, and added mass are obtained. On this basis, the rotational performance of amphibious aircraft is predicted. The results show that when the rudder is fully deflected, the rotation radius is 3159.1 m; when the engine differential and rudder run together, the rotation radius is 1216.8 m; the engine differential can effectively improve the rotation efficiency of amphibious aircraft on the water surface.