Biomimetic airfoil design and flow characteristics based on sturgeon
The series of airfoils developed by the National Advisory Committee for Aeronautics(NACA)were widely used to design hydraulic machinery.However,unfavorable flows,such as unstable eddy currents and cavitation turbulence,were likely to occur because of the influence of liquid,thus reducing hydraulic performance.This paper selected aquatic sturgeon as the research object of biomimetic wing shape,and used high-precision scanning technology with 3D reverse to obtain its geometric characteristics,and the physical model of novel bionic airfoil was then constructed.The lift-drag characteristics,eddy current,and cavitation flow of the bionic airfoil were studied numerically.Results showed that the lift-drag characteristics of the bionic airfoil were better than those of the NACA 0012 airfoil.The bionic airfoil had a small cavitation instability area at the leading edge.The front edge of the airfoil formed two local low-speed zones.The local low-velocity region closed to the fluid flow direction and the re-entrant jet flow range decreased with the angle of the leading edge of the airfoil.The scheme of the downward leading edge had the smallest vortex,and the fluid flow was relatively stable.Different from traditional NACA0012 airfoils,the water-jet pump with a bionic hydrofoil had increased its head by 7.68％and increased its efficiency by 4.73％.The results could serve as a reference for the optimal design of hydraulic machinery blades.
万方数据
维普
