Analysis of bionic hydrofoil propulsive performance

Combined with the motion characteristics of turtles, a 2 degree-of-freedom periodic moving method is proposed for the single hydrofoil model of a hydrofoil propelled prototype. According to the hydrofoil hydrodynamic calculation formula, factors and motion parameters that affect thrust force produced by the hydrofoil are concluded. Changes of factors related in different profiles of stroke spin angular velocity are analyzed. Effects of different profiles of stroke spin angular velocity to the hydrofoil propulsive performance are predicted. Taking the average thrust force produced by the hydrofoil in periodic motion as the yardstick of the hydrofoil propulsive performance, three kinds of profiles of stroke spin angular velocity are adopted in calculation respectively, relationships between the average thrust force and the azimuth spin amplitude as well as the angular frequency are obtained. Taking the physical parameter limitations of the hydrofoil model into consideration, the optimal comprehensive propulsive properties of the hydrofoil is achieved using the trigonometric function profile stroke spin angular velocity with the same motion parameters.